Built-in functions
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Zabs | Returns the absolute value of numeric data. |
acos | Computes the inverse cosine of numeric types. |
addfile | Opens a data file that is (or is to be) written in a supported file format. |
addfiles | Creates a reference that spans multiple data files. |
all | Returns True if all the elements of the input evaluate as True. |
angmom_atm | Calculates the atmosphere's relative angular momentum. |
any | Returns True if any of the values of its input evaluate as True. |
area_conserve_remap | Performs areal conservative remapping from one rectilinear grid to another. |
area_hi2lores | Interpolates from high resolution rectilinear grids to low resolution recitlinear grids using local area averaging. |
area_poly_sphere | Calculates the area enclosed by an arbitrary polygon on the sphere. |
asciiread | Reads a file that contains ASCII representations of basic data types. |
asciiwrite | Creates an ascii text file of numeric or string data type. |
asin | Computes the inverse sine of numeric types. |
atan | Computes the inverse tangent of numeric types. |
atan2 | Computes the inverse tangent of (y/x) for numeric types. |
attsetvalues | Applies resources to the given objects. |
avg | Computes the average of a variable regardless of dimensionality. |
betainc | Evaluates the incomplete beta function. |
bin_avg | Calculates gridded binned averages and counts on a rectilinear grid using randomly spaced data. |
bin_sum | Calculates binned sums and counts over multiple invocations of the procedure on a rectilinear grid. |
bw_bandpass_filter | Applies a Butterworth bandpass filter optimized for narrow bandwidths to time series. |
cancor | Performs canonical correlation analysis between two sets of variables. |
cbinread | Reads binary files created using the C block I/O function write. |
cbinwrite | Creates a binary file in raw C block I/O format for a numeric data type. |
cd_calendar | Converts a mixed Julian/Gregorian date to a UT-referenced date. |
cd_inv_calendar | Converts a UT-referenced date to a mixed Julian/Gregorian date. |
cdfbin_p | Calculates the binomial density of a cumulative distribution function. |
cdfbin_pr | Calculates the probability of success of each trial of a cumulative distribution function. |
cdfbin_s | Calculates the number of successes of a cumulative distribution function. |
cdfbin_xn | Calculates the number of binomial trials of a cumulative distribution function. |
cdfchi_p | Calculates the integral of a cumulative chi-square distribution function. |
cdfchi_x | Calculates the upper limit of integration of a cumulative chi-square distribution function. |
cdfgam_p | Calculates the integral of a cumulative gamma distribution function. |
cdfgam_x | Calculates the upper limit of integration of a cumulative gamma distribution function. |
cdfnor_p | Calculates the integral of a cumulative normal distribution function. |
cdfnor_x | Calculates the upper limit of integration of a cumulative normal distribution function. |
cdft_p | Calculates the one-sided probability given a t-value and the degrees of freedom. |
cdft_t | Calculates the t-value given the one-sided probability and the degrees of freedom. |
ceemdan | Complete Ensemble Empirical Mode Decomposition with Adaptive Noise. |
ceil | Returns the smallest integral value greater than or equal to each input value. |
center_finite_diff | Performs a centered finite difference operation on the rightmost dimension. |
center_finite_diff_n | Performs a centered finite difference operation on the given dimension. |
cfftb | Performs a backward complex discrete fourier transform [Fourier Synthesis]. |
cfftf | Performs a forward complex discrete fourier transform of a real periodic sequence. |
cfftf_frq_reorder | Reorders the data returned by cfftf. |
charactertodouble | Coerces values of type character to values of type double (deprecated; use todouble). |
charactertofloat | Coerces values of type character to values of type float (deprecated; use tofloat). |
charactertointeger | Coerces values of type character to values of type integer (deprecated; use tointeger). |
charactertolong | Coerces values of type character to values of NCL type long (deprecated; use tolong). |
charactertoshort | Coerces values of type character to values of type short (deprecated; use toshort). |
charactertostring | Coerces values of type character to values of type string (deprecated; use tostring). |
chartodouble | Coerces values of type character to values of type double (deprecated; use todouble). |
chartofloat | Coerces values of type character to values of type float (deprecated; use tofloat). |
chartoint | Coerces values of type character to values of type integer (deprecated; use toint). |
chartointeger | Coerces values of type character to values of type integer (deprecated; use tointeger). |
chartolong | Coerces values of type character to values of NCL type long (deprecated; use tolong). |
chartoshort | Coerces values of type character to values of type short (deprecated; use toshort). |
chartostring | Coerces values of type character to values of type string (deprecated; use tostring). |
chiinv | Evaluates the inverse chi-squared distribution function. |
cla_sq | Create a string that uses single quotes (sq) to enclose command line assignment (CLA) statements for later use by NCL's system procedure. |
clear | Clears the given workstation objects. |
color_index_to_rgba | Converts an absolute color index to its equivalent RGBA quadruplet |
conform | Expands an array or scalar so that it conforms to the shape of the given variable. |
conform_dims | Expands an array or scalar so that it conforms to the shape of the given dimension sizes. |
cos | Computes the cosine of numeric types. |
cosh | Computes the hyperbolic cosine of numeric types. |
count_unique_values | Counts the number of unique values in the given array. |
count_unique_values_n | Counts the number of unique values in the given array, across the given dimension. |
covcorm | Calculates a covariance or correlation matrix. |
covcorm_xy | Calculates a covariance or correlation matrix given two separate 'n x m' arrays. |
craybinnumrec | Returns the number of unformatted sequential access Fortran records in a Cray COS blocked binary file. |
craybinrecread | Reads COS blocked unformatted sequential access Fortran binary files. |
create_graphic | Creates a graphic object |
csa1 | Calculates an approximating cubic spline for the input data, one 1-dimensional section at a time. |
csa1d | Calculates an approximating cubic spline for the input data, one 1-dimensional section at a time. |
csa1s | Calculates an approximating cubic spline for the input data, one 1-dimensional section at a time. |
csa1x | Calculates an approximating cubic spline for the input data, one 1-dimensional section at a time. |
csa1xd | Calculates an approximating cubic spline for the input data, one 1-dimensional section at a time. |
csa1xs | Calculates an approximating cubic spline for the input data, one 1-dimensional section at a time. |
csa2 | Calculates an approximating cubic spline for two-dimensional input data. |
csa2d | Calculates an approximating cubic spline for two-dimensional input data. |
csa2l | Calculates an approximating cubic spline for two-dimensional input data. |
csa2ld | Calculates an approximating cubic spline for two-dimensional input data. |
csa2ls | Calculates an approximating cubic spline for two-dimensional input data. |
csa2lx | Calculates an approximating cubic spline for two-dimensional input data. |
csa2lxd | Calculates an approximating cubic spline for two-dimensional input data. |
csa2lxs | Calculates an approximating cubic spline for two-dimensional input data. |
csa2s | Calculates an approximating cubic spline for two-dimensional input data. |
csa2x | Calculates an approximating cubic spline for two-dimensional input data. |
csa2xd | Calculates an approximating cubic spline for two-dimensional input data. |
csa2xs | Calculates an approximating cubic spline for two-dimensional input data. |
csa3 | Calculates an approximating cubic spline for three-dimensional input data. |
csa3d | Calculates an approximating cubic spline for three-dimensional input data. |
csa3l | Calculates an approximating cubic spline for three-dimensional input data. |
csa3ld | Calculates an approximating cubic spline for three-dimensional input data. |
csa3ls | Calculates an approximating cubic spline for three-dimensional input data. |
csa3lx | Calculates an approximating cubic spline for three-dimensional input data. |
csa3lxd | Calculates an approximating cubic spline for three-dimensional input data. |
csa3lxs | Calculates an approximating cubic spline for three-dimensional input data. |
csa3s | Calculates an approximating cubic spline for three-dimensional input data. |
csa3x | Calculates an approximating cubic spline for three-dimensional input data. |
csa3xd | Calculates an approximating cubic spline for three-dimensional input data. |
csa3xs | Calculates an approximating cubic spline for three-dimensional input data. |
csc2s | Converts Cartesian coordinates on a unit sphere to spherical coordinates (lat/lon). |
csgetp | Retrieves control parameters for Cssgrid routines. |
css2c | Converts spherical coordinates (lat/lon) to Cartesian coordinates on a unit sphere. |
cssetp | Sets control parameters for Cssgrid routines. |
cssgrid | Uses tension splines to interpolate unstructured (randomly-spaced) data on a unit sphere to data values on a rectilinear grid. |
csstri | Calculates a Delaunay triangulation of data randomly positioned on the surface of a sphere. |
csvoro | Determines Voronoi polygons for data randomly positioned on a sphere and returns vertices for the one surrounding a specified input point. |
cumsum | Calculates the cumulative sum. |
cz2ccm | Computes geopotential height in hybrid coordinates. |
datatondc | Converts data units into normalized device coordinates (NDCs). |
day_of_week | Calculates the day of the week given month, day, and year (Gregorian calendar). |
day_of_year | Calculates the day of the year (sometimes erroneously referred to as 'julian day') given Gregorian calendar month, day, and year. |
days_in_month | Calculates the number of days in a month given month and year. |
default_fillvalue | Returns the default missing value for the given variable type. |
delete | Deletes variables, attributes, and coordinate variables. |
depth_to_pres | Convert ocean depth to pressure. |
destroy | Destroys objects from NCL. |
determinant | Calculates the determinant of a square real matrix. |
dewtemp_trh | Calculates the dew point temperature given temperature and relative humidity. |
dgeevx_lapack | Given a square (N,N) real nonsymmetric matrix, compute the eigenvalues and, optionally, the left and/or right eigenvectors via the LAPACK subroutine dgeevx. |
dim_acumrun_n | Calculates individual accumulated sums of sequences ('runs') of a specified length. |
dim_avg | Computes the average of a variable's rightmost dimension at all other dimensions. |
dim_avg_n | Computes the average of a variable's given dimension(s) at all other dimensions. |
dim_avg_wgt | Computes the weighted average of a variable's rightmost dimension at all other dimensions. |
dim_avg_wgt_n | Computes the weighted average of a variable's given dimension at all other dimensions. |
dim_cumsum | Calculates the cumulative sum along the rightmost dimension. |
dim_cumsum_n | Calculates the cumulative sum along the given dimension(s). |
dim_gamfit_n | Fit data to the two parameter gamma distribution. |
dim_gbits | Unpacks bit chunks from the rightmost dimension of the input array. |
dim_max | Finds the maximum of a variable's rightmost dimension at all other dimensions. |
dim_max_n | Finds the maximum of a variable's given dimensions at all other dimensions. |
dim_median | Computes the median of a variable's rightmost dimension at all other dimensions. |
dim_median_n | Computes the median of a variable's given dimensions at all other dimensions. |
dim_min | Finds the minimum of a variable's rightmost dimension at all other dimensions. |
dim_min_n | Finds the minimum of a variable's given dimensions at all other dimensions. |
dim_num | Calculates the number of True values of a variable's rightmost dimension at all other dimensions. |
dim_num_n | Calculates the number of True values of a variable's given dimensions at all other dimensions. |
dim_numrun_n | Counts the number of "runs" (sequences) within a series containing zeros and ones. |
dim_pqsort | Computes the permutation vector generated by sorting the n - 1th (rightmost) dimension. |
dim_pqsort_n | Computes the permutation vector generated by sorting the given dimension. |
dim_product | Computes the product of a variable's rightmost dimension at all other dimensions. |
dim_product_n | Computes the product of a variable's given dimension(s) at all other dimensions. |
dim_rmsd | Computes the root-mean-square-difference between two variables' rightmost dimension at all other dimensions. |
dim_rmsd_n | Computes the root-mean-square-difference between two variables' given dimensions at all other dimensions. |
dim_rmvmean | Calculates and removes the mean of the (rightmost) dimension at all other dimensions. |
dim_rmvmean_n | Calculates and removes the mean of the given dimension(s) at all other dimensions. |
dim_rmvmed | Calculates and removes the median of the (rightmost) dimension at all other dimensions. |
dim_rmvmed_n | Calculates and removes the median of the given dimension(s) at all other dimensions. |
dim_spi_n | Calculates the standardized precipitation index (SPI) by fitting a gamma or a Pearson Type III distribution to monthly precipitation values. |
dim_standardize | Calculates standardized anomalies of the rightmost dimension at all other dimensions. |
dim_standardize_n | Calculates standardized anomalies of the given dimension(s) at all other dimensions. |
dim_stat4 | Computes the first four moments (average, sample variance, skewness, and kurtosis) of the rightmost dimension for all other dimensions. |
dim_stat4_n | Computes the first four moments (average, sample variance, skewness, and kurtosis) of the given dimension(s) for all other dimensions. |
dim_stddev | Computes the sample standard deviation of a variable's rightmost dimension at all other dimensions. |
dim_stddev_n | Computes the sample standard deviation of a variable's given dimension(s) at all other dimensions. |
dim_sum | Computes the arithmetic sum of a variable's rightmost dimension at all other dimensions. |
dim_sum_n | Computes the arithmetic sum of a variable's given dimension(s) at all other dimensions. |
dim_sum_wgt | Computes the weighted sum of a variable's rightmost dimension at all other dimensions. |
dim_sum_wgt_n | Computes the weighted sum of a variable's given dimension at all other dimensions. |
dim_variance | Computes the unbiased estimates of the variance of a variable's rightmost dimension. |
dim_variance_n | Computes the unbiased estimates of the variance of a variable's given dimension(s) at all other dimensions. |
dimsizes | Returns the dimension sizes of the input variable. |
doubletobyte | Coerces values of type double to values of type byte (deprecated; use tobyte). |
doubletochar | Coerces values of type double to values of type character (deprecated; use tochar). |
doubletocharacter | Coerces values of type double to values of type character (deprecated; use tochar). |
doubletofloat | Coerces values of type double to values of type float (deprecated; use tofloat). |
doubletoint | Coerces values of type double to values of type integer (deprecated; use toint). |
doubletointeger | Coerces values of type double to values of type integer (deprecated; use tointeger). |
doubletolong | Coerces values of type double to values of type long (deprecated; use tolong). |
doubletoshort | Coerces values of type double to values of type short (deprecated; use toshort). |
dpres_hybrid_ccm | Calculates the pressure differences of a hybrid coordinate system. |
dpres_plevel | Calculates the pressure layer thicknesses of a constant pressure level coordinate system. |
draw | Draws the given graphical objects. |
draw_color_palette | Draws the given colors or color map as a series of filled boxes. |
dsgetp | Gets parameters for Dsgrid routines. |
dsgrid2 | Interpolates data from an unstructured (randomly-spaced) grid to a rectilinear grid using inverse distance weighted interpolation. |
dsgrid2d | Interpolates double data from an unstructured (randomly-spaced) grid to a rectilinear grid using inverse distance weighted interpolation. (Deprecated version.) |
dsgrid2s | Interpolates float data from an unstructured (randomly-spaced) grid to a rectilinear grid using inverse distance weighted interpolation. (Deprecated version.) |
dsgrid3 | Interpolates data from an unstructured (randomly-spaced) grid to a 3D grid using inverse distance weighted interpolation. |
dsgrid3d | Interpolates double data from an unstructured (randomly-spaced) grid to a 3D grid using inverse distance weighted interpolation. (Deprecated version.) |
dsgrid3s | Interpolates float data from an unstructured (randomly-spaced) grid to a 3D grid using inverse distance weighted interpolation. (Deprecated version.) |
dspnt2 | Interpolates 2D data at specified points. |
dspnt2d | Interpolates 2D data at specified points. (Deprecated version.) |
dspnt2s | Interpolates 2D float data at specified points. (Deprecated version.) |
dspnt3 | Interpolates 3D data at specified points. |
dspnt3d | Interpolates 3D double data at specified points. (Deprecated version.) |
dspnt3s | Interpolates 3D float data at specified points. (Deprecated version.) |
dssetp | Sets parameters for Dsgrid routines. |
dtrend | Estimates and removes the least squares linear trend of the rightmost dimension from all grid points. |
dtrend_msg | Estimates and removes the least squares linear trend of the rightmost dimension from all grid points (missing values allowed). |
dtrend_msg_n | Estimates and removes the least squares linear trend of the dim-th dimension from all grid points (missing values allowed). |
dtrend_n | Estimates and removes the least squares linear trend of the given dimension from all grid points. |
dtrend_quadratic | Estimates and removes the least squares quadratic trend of the rightmost dimension from all grid points. |
dtrend_quadratic_msg_n | Estimates and removes the least squares quadratic trend of the dim-th dimension from all grid points (missing values allowed). |
dv2uvF | Computes the divergent (irrotational) wind components for a fixed grid via spherical harmonics. |
dv2uvf | Computes the divergent (irrotational) wind components for a fixed grid via spherical harmonics. |
dv2uvG | Computes the divergent (irrotational) wind components for a gaussian grid via spherical harmonics. |
dv2uvg | Computes the divergent (irrotational) wind components for a gaussian grid via spherical harmonics. |
dz_height | Calculates the height layer thicknesses at each grid point over varying surface terrain. |
echo_off | Disables echoing of NCL statements as they are encountered. |
echo_on | Enables echoing of NCL statements as they are encountered. |
eemd | Perform ensemble empirical mode decomposition (EEMD). |
eof2data | Reconstructs a data set from EOFs and EOF time series. |
eof2data_n | Reconstructs a data set from EOFs and EOF time series, given an index that specifies which dimension contains the time dimemsion. |
eof_varimax | Rotates EOFs using the using Kaiser row normalization and the varimax criterion (deprecated version). |
eofcor | Calculates empirical orthogonal functions via a correlation matrix (NCL's original function). |
eofcor_pcmsg | Calculates empirical orthogonal functions via a correlation matrix (missing values allowed) (deprecated version). |
eofcor_ts | Calculates the time series of the amplitudes associated with each eigenvalue in an EOF which was calculated using a correlation matrix. |
eofcov | Calculates empirical orthogonal functions via a covariance matrix (original version). |
eofcov_pcmsg | Calculates empirical orthogonal functions via a covariance matrix (missing values allowed)(deprecated version). |
eofcov_ts | Calculates the time series of the amplitudes associated with each eigenvalue in an EOF which was calculated using a covariance matrix. |
eofunc | Computes empirical orthogonal functions (EOFs, aka: Principal Component Analysis). |
eofunc_n | Computes empirical orthogonal functions (EOFs, aka: Principal Component Analysis), given an index that specifies which dimension contains the number of observations. |
eofunc_ts | Calculates the time series of the amplitudes associated with each eigenvalue in an EOF. |
eofunc_ts_n | Calculates the time series of the amplitudes associated with each eigenvalue in an EOF, given an index that specifies the time dimension. |
eofunc_varimax | Rotates EOFs using the using Kaiser row normalization and the varimax criterion. |
equiv_sample_size | Estimates the number of independent values in a series of correlated values. |
erf | Evaluates the real error function. |
erfc | Evaluates the real complementary error function. |
esacr | Computes sample auto-correlations. |
esacr_n | Computes sample auto-correlations on the given dimension. |
esacv | Computes sample auto-covariances |
esccr | Computes sample cross-correlations. |
esccv | Computes sample cross-covariances. |
escorc | Computes the (Pearson) sample linear cross-correlations at lag 0 only. |
escorc_n | Computes the (Pearson) sample linear cross-correlations at lag 0 only, across the specified dimensions. |
escovc | Computes sample cross-covariances at lag 0 only. |
exit | Forces an NCL script to exit immediately. |
exp | Computes the value of e (the base of natural logarithms) raised to the power of the input. |
exp_tapersh | Performs tapering (filtering) of the spherical harmonic coefficients. |
exp_tapersh_wgts | Calculates weights which can be used to perform tapering (filtering) of spherical harmonic coefficients. |
exp_tapershC | Performs tapering (filtering) of the spherical harmonic coefficients. |
extval_mlegev | Estimates the shape, scale and location parameters for the Generalized Extreme-Value (GEV) distribution using Maximum-Likelihood Estimation (MLE). |
ezfftb | Perform a Fourier synthesis from real and imaginary coefficients. |
ezfftb_n | Perform a Fourier synthesis from real and imaginary coefficients on the given dimension. |
ezfftf | Perform a Fourier analysis on a real periodic sequence. |
ezfftf_n | Performs a Fourier analysis on a real periodic sequence on the given dimension. |
f2fosh | Interpolates a scalar quantity from a fixed grid (including pole points) to a fixed-offset grid. |
f2foshv | Interpolates a vector quantity on a fixed grid (including pole points) to a fixed-offset grid. |
f2fsh | Interpolates a scalar quantity from one fixed grid to another. |
f2fshv | Interpolates a vector quantity from one fixed grid to another. |
f2gsh | Interpolates a scalar quantity from a fixed grid to a Gaussian grid (with optional truncation). |
f2gshv | Interpolates a vector quantity on a fixed grid to a Gaussian grid (optional truncation). |
fabs | Computes the absolute value of numeric types. |
fbindirread | Reads binary records written by a Fortran direct access write or C write. |
fbindirwrite | Writes binary records to a file in manner analogous to fortran's "access=direct". |
fbinnumrec | Returns the number of unformatted sequential Fortran records in a binary file. |
fbinread | Reads one binary record that has been written using an UNFORMATTED FORTRAN write. |
fbinrecread | Reads unformatted sequential access Fortran binary files. |
fbinrecwrite | Writes a single unformatted sequential access Fortran record to a file. |
fbinwrite | Writes a single binary record to a file in manner analogous to Fortran's "form=unformatted, access=sequential". |
fft2db | Performs a two-dimensional discrete backward Fourier transform (Fourier synthesis). |
fft2df | Performs a two-dimensional forward real discrete Fourier transform (i.e., Fourier analysis) of a real periodic array. |
fftshift | Rearranges an array in a manner similar to Matlab's fftshift function. |
fileattdef | Defines global (file) attributes associated with a supported file. |
filechunkdimdef | Defines chunking dimension names, dimension sizes, unlimited dimensions on a supported file. |
filedimdef | Defines dimension names, dimension sizes, unlimited dimensions on a supported file. |
fileexists | Checks for existence of any UNIX file. |
filegrpdef | Defines a list of group (names), for a supported file, or group. |
filevarattdef | Copies attributes from an input variable to one or more variables on a supported file. |
filevarchunkdef | Defines a list of variable names, variable var_types, and variable dimension names for a supported file. |
filevarcompressleveldef | Defines a list of variable names, variable var_types, and variable dimension names for a supported file. |
filevardef | Defines a list of variable names, variable types, and variable dimension names for a supported file. |
filevardimsizes | Returns the dimension sizes of a variable on the given file (deprecated; use getfilevardimsizes). |
filwgts_lancos | Calculates one-dimensional filter weights (deprecated). |
filwgts_lanczos | Calculates one-dimensional filter weights. |
filwgts_normal | Calculates one-dimensional filter weights based upon the normal (gaussian) distribution. |
floattobyte | Coerces values of type float to values of type byte. |
floattochar | Coerces values of type float to values of type character. |
floattocharacter | Coerces values of type float to values of type character. |
floattoint | Coerces values of type float to values of type integer. |
floattointeger | Coerces values of type float to values of type integer. |
floattolong | Coerces values of type float to values of type long. |
floattoshort | Coerces values of type float to values of type short. |
floor | Returns the largest integral value less than or equal to each input value. |
fluxEddy | Calculates time averaged eddy flux quantities. |
fo2fsh | Interpolates a scalar quantity from a fixed-offset grid to a fixed grid. |
fo2fshv | Interpolates a vector quantity from a fixed-offset grid to a fixed grid. |
fourier_info | Performs Fourier analysis on one or more periodic series. |
frame | Updates and clears the given workstation objects. |
fspan | Creates an array of evenly-spaced floating point numbers. |
ftcurv | Calculates an interpolatory spline through a sequence of functional values. |
ftcurvd | Calculates the derivatives of an interpolatory spline under tension. |
ftcurvi | Calculates integrals of an interpolatory spline under tension between two user-specified limits. |
ftcurvp | Calculates an interpolatory spline under tension through a sequence of functional values for a periodic function. |
ftcurvpi | Calculates an integral of an interpolatory spline between two specified points. |
ftcurvps | Calculates a smoothing spline. |
ftcurvs | Calculates a smoothing spline. |
ftest | Applies F-test for variances and returns an estimate of the statistical significance. |
ftgetp | Retrieves control parameters for Fitgrid routines. |
ftkurv | Calculates an interpolatory spline for parametric curves. |
ftkurvd | Calculates an interpolatory spline for parametric curves; it also calculates first and second derivatives of the interpolatory spline. |
ftkurvp | Calculates an interpolatory spline under tension through a sequence of points in the plane forming a closed curve. |
ftkurvpd | Calculates an interpolatory spline for closed parametric curves; it also calculates first and second derivatives of the interpolatory spline. |
ftsetp | Sets control parameters for Fitgrid routines. |
ftsurf | Calculates an interpolatory surface passing through a rectangular grid of function values. |
g2fsh | Interpolates a scalar quantity from a Gaussian grid to a fixed grid. |
g2fshv | Interpolates a vector quantity from a Gaussian grid to a fixed grid. |
g2gsh | Interpolates a scalar quantity from one Gaussian grid to another (with optional truncation). |
g2gshv | Interpolates a vector quantity from one Gaussian grid to another (with optional truncation). |
gamma | Evaluates the complete gamma function. |
gammainc | Evaluates the incomplete gamma function. |
gaus | Computes Gaussian latitudes and weights. |
gaus_lobat | Computes Gaussian latitudes and weights using Gauss-Lobatto quadrature. |
gaus_lobat_wgt | Computes Gauss-Lobatto weights given a one-dimensional array of Gauss-Lobatto latitudes. |
gc_aangle | Finds the acute angle between two great circles on the globe. |
gc_clkwise | Tests clockwise/counterclockwise ordering of points on spherical polygon. |
gc_dangle | Finds the directed angle between two great circles having a specified intersection point. |
gc_inout | Determines if a list of lat/lon specified points are inside or outside of spherical lat/lon polygon(s). |
gc_latlon | Finds the great circle distance (true surface distance) between two points on the globe and interpolates points along the great circle. |
gc_onarc | Determines if a point on the globe lies on a specified great circle arc. |
gc_pnt2gc | Finds the angular distance from a point to a great circle. |
gc_qarea | Finds the area of a quadrilateral patch on the unit sphere. |
gc_tarea | Finds the area of a triangular patch on the unit sphere. |
generate_2d_array | Generates a "nice" 2D array of pseudo random data, especially for use in 2D graphics. |
get_bitfield | Unpacks bit fields from an array. |
get_color_rgba | Chooses an RGB triplet or RGBA quadruplet for a scalar value, given a color map and a range of values. |
get_cpu_time | Returns the CPU time used by NCL. |
get_isolines | Retrieves the points that define a contour line. |
get_ncl_version | Returns the current NCL version. |
get_script_name | Returns the name of a script of commands provided to NCL for execution. |
get_script_prefix_name | Returns the name of a script of commands provided to NCL for execution, if provided, with any script name tag removed. |
get_sphere_radius | Retrieves the radius of a sphere used in spherical harmonic routines. |
get_unique_values | Returns the unique values of the given array. |
getbitsone | Unpacks one-bit chunks from the input array. |
getenv | Returns the string value of a shell environment variable. |
getfileatts | Returns a list of attribute names on the given file. |
getfiledimnames | Returns a list of dimension names for the given file. |
getfiledims | Returns a list of dimension names for the given file. |
getfiledimsizes | Returns an array of dimension sizes on the given file. |
getfilegrpnames | Returns an array of file group names on the given file. |
getfilepath | Returns a string of the opened file's path. |
getfilevaratts | Returns all attribute names associated with a variable on the given file. |
getfilevarchunkdimsizes | Returns the chunk dimension sizes of variable on a given file which has chunk dimensions. |
getfilevardimnames | Returns all dimension names associated with a variable on the given file. |
getfilevardims | Returns all dimension names associated with a variable on the given file. |
getfilevardimsizes | Returns the dimension sizes of a variable on a given file. |
getfilevarnames | Returns an array of file variable names on the given file. |
getfilevartypes | Returns the types of the named variables stored in the given file. |
getvaratts | Returns a list of attribute names for the given variable or file pointer. |
getvardimnames | Returns a list of dimension names for the given variable. |
getvardims | Returns a list of dimension names for the given variable. |
getvardimsizes | Returns the dimension sizes of the input variable. |
gradsf | Computes the gradient of an array that is on a fixed grid using spherical harmonics. |
gradsg | Computes the gradient of an array that is on a gaussian grid using spherical harmonics. |
greg2jul | Converts Gregorian dates to astronomical Julian days. |
grid2triple | Converts a two-dimensional grid with one-dimensional coordinate variables to an array where each grid value is associated with its coordinates. |
hlsrgb | Converts HLS color values to RGB. |
hsvrgb | Converts HSV color values to RGB. |
hydro | Computes geopotential height using the hydrostatic equation. |
hyi2hyo | Interpolates from data on one set of hybrid levels to another set of hybrid levels. |
idsfft | Interpolates 2D random data. |
igradsf | Computes a scalar array from its gradient components on a fixed grid using spherical harmonics. |
igradsF | Computes a scalar array from its gradient components on a fixed grid using spherical harmonics. |
igradsg | Computes a scalar array from its gradient components on a gaussian grid using spherical harmonics. |
igradsG | Computes a scalar array from its gradient components on a gaussian grid using spherical harmonics. |
ilapsf | Inverts the Laplacian (on a fixed grid) using spherical harmonics. |
ilapsF | Inverts the Laplacian (on a fixed grid) using spherical harmonics. |
ilapsg | Inverts the Laplacian (on a gaussian grid) using spherical harmonics. |
ilapsG | Inverts the Laplacian (on a gaussian grid) using spherical harmonics. |
ilapvf | Inverts the vector Laplacian (on a fixed grid) using spherical harmonics. |
ilapvg | Inverts the vector Laplacian (on a gaussian grid) using spherical harmonics. |
ind | Returns the indices where the input is True. |
ind_resolve | Resolves a single list of indices to their multi-dimensional representation. |
indStrSubset | Returns the indices corresponding to the location of the substring, if it is a subset of the other given string. (Deprecated: see str_index_of_substr.) |
int2p | Interpolates pressure levels to a different set of pressure levels. |
int2p_n | Interpolates pressure levels to a different set of pressure levels on the given dimension. |
integertobyte | Coerces values of type integer to values of type byte. |
integertochar | Coerces values of type integer to values of type character. |
integertocharacter | Coerces values of type integer to values of type character. |
integertoshort | Coerces values of type integer to values of type short. |
inttobyte | Coerces values of type integer to values of type byte. |
inttochar | Coerces values of type integer to values of type character. |
inttoshort | Coerces values of type integer to values of type short. |
inverse_matrix | Computes the inverse of a general matrix using LU factorization. |
is_string_numeric | Returns True for every element of the input string array that contains a numeric value. |
isatt | Returns logical values indicating whether the given attributes are attached to the given variable. |
isbigendian | Returns True if you are running NCL on a big endian machine. |
isbyte | Returns True if input is of type byte. |
ischar | Returns True if input is of type char. |
isconform | Check two variables for array conformance (same shape and size). |
iscoord | Returns True for every input string that is a coordinate variable of the given variable. |
isdefined | Returns True for every element of the input that is a defined keyword, variable, or function/procedure name. |
isdim | Returns True if variable dimensions are defined in the given variable. |
isdimnamed | Returns True if variable dimensions have names in given variable. |
isdouble | Returns True if input is of type double. |
isenumeric | Returns True if input is of type enumeric. |
isfile | Returns True if input is of type file. |
isfilepresent | Checks if a supported file exists. |
isfilevar | Checks if specified file variables are defined in a file. |
isfilevaratt | Checks if specified file variable attributes are defined for a file variable. |
isfilevarcoord | Checks if a coordinate variable is defined in a file. |
isfilevardim | Checks if file variable dimensions are defined for a file variable. |
isfloat | Returns True if input is of type float. |
isfunc | Returns True for every element of the input that is a defined function. |
isgraphic | Returns True if input is of type graphic. |
isint | Returns True if input is of type integer. |
isint64 | Returns True if input is of type int64. |
isinteger | Returns True if input is of type integer. |
isleapyear | Determines if a given year is a leap year. |
islogical | Returns True if input is of type logical. |
islong | Returns True if input is of type long. |
ismissing | Returns True for every element of the input that contains a missing value (_FillValue). |
isnan_ieee | Returns a logical array indicating which input values contain an IEEE NaN. |
isnumeric | Returns True if input is of type numeric. |
ispan | Creates an array of equally-spaced integer, long, or int64 values. |
isproc | Returns True for every element of the input that is a defined procedure. |
isscalar | Returns True if the given argument is a scalar (rank one and size one). |
isshort | Returns True if input is of type short. |
issnumeric | Returns True if input is of type snumeric. |
isstring | Returns True if input is of type string. |
isStrSubset | Return True or False if one string is a subset of another string. |
isubyte | Returns True if input is of type unsigned byte (ubyte). |
isuint | Returns True if input is of type unsigned integer (uint). |
isuint64 | Returns True if input is of type unsigned 64-bit integer (uint64). |
isulong | Returns True if input is of type unsigned long (ulong). |
isunlimited | Returns True if the given dimension name is defined as unlimited on the given file. |
isunsigned | Returns True if input is one of the unsigned types. |
isushort | Returns True if input is of type unsigned short (ushort). |
isvar | Returns True for every element of the input that is a defined variable. |
jul2greg | Converts an astronomical Julian day to a Gregorian date. |
kde_n_test | Uses gaussian kernel density estimation (KDE) to estimate the probability density function of a random variable. This function is under construction and is available for testing only. It may not be released with NCL V6.5.0. |
kmeans_as136 | Performs k-means clustering via the Hartigan and Wong AS-136 algorithm. |
kolsm2_n | Uses the Kolmogorov-Smirnov two-sample test to determine if two samples are from the same distribution. |
kron_product | Computes the Kronecker product for two-dimensional matrices. |
lapsF | Computes the Laplacian using spherical harmonics, given a scalar z on a fixed grid. |
lapsf | Computes the Laplacian using spherical harmonics, given a scalar z on a fixed grid. |
lapsG | Computes the Laplacian using spherical harmonics, given a scalar z on a gaussian grid. |
lapsg | Computes the Laplacian using spherical harmonics, given a scalar z on a gaussian grid. |
lapvf | Computes the vector Laplacian using spherical harmonics, given a vector quantity (u,v) on a fixed grid. |
lapvg | Computes the vector Laplacian using spherical harmonics, given a vector quantity (u,v) on a gaussian grid. |
latlon2utm | Converts from lat/lon to UTM using a specified datum. |
lclvl | Calculates the pressure of the lifting condensation level. |
lderuvf | Computes the latitudinal derivatives using spherical harmonics, given vector components (u,v) on a fixed grid. |
lderuvg | Computes the latitudinal derivatives using spherical harmonics, given vector components (u,v) on a gaussian grid. |
linint1 | Interpolates from one series to another using piecewise linear interpolation across the rightmost dimension. |
linint1_n | Interpolates from one series to another using piecewise linear interpolation across the given dimension. |
linint2 | Interpolates from a rectilinear grid to another rectilinear grid using bilinear interpolation. |
linint2_points | Interpolates from a rectilinear grid to an unstructured grid using bilinear interpolation. |
linmsg | Linearly interpolates to fill in missing values. |
linmsg_n | Linearly interpolates to fill in missing values, given the dimension to do the interpolation across. |
linrood_latwgt | Computes the latitudes and weights used by the Lin-Rood Model. |
linrood_wgt | Computes the weights used by the Lin-Rood Model. |
list_files | Lists all of the variables that reference files. |
list_filevars | Lists all of the variables associated with a specific file. |
list_hlus | Lists all of the HLU objects currently referenced by NCL variables. |
list_procfuncs | Lists all of the currently defined NCL functions and procedures and their argument lists. |
list_vars | Lists the currently defined variables that do not reference files or HLU objects. |
ListAppend | Append a variable into the list. |
ListCount | Queries the number of element(s) in a list. |
ListGetType | Queries the manner in which a variable of type list was created. |
ListIndex | Queries the index of a variable in a list. |
ListIndexFromName | Returns the index of a variable in a list given its name. |
ListPop | Pop (out) an element from a list. |
ListPush | Push a variable into the list. |
ListSetType | Specifies the manner in which a variable of type list is to be implemented. |
loadscript | Loads the given NCL script. |
local_max | Determines the relative maxima for a 2-dimensional array. |
local_min | Determines the relative minima for a 2-dimensional array. |
log | Computes the natural log of a numeric type. |
log10 | Computes the log base 10 of a numeric type. |
longtobyte | Coerces values of type long to values of type byte. |
longtochar | Coerces values of type long to values of type character. |
longtocharacter | Coerces values of type long to values of type character. |
longtoint | Coerces values of type long to values of type integer. |
longtointeger | Coerces values of type long to values of type integer. |
longtoshort | Coerces values of type long to values of type short. |
lspoly | Calculates a set of coefficients for a weighted least squares polynomial fit to the given data. |
lspoly_n | Calculates a set of coefficients for a weighted least squares polynomial fit to the given data on the given dimension. |
mask | Masks a multi-dimensional array against another given a single mask value. |
max | Computes the maximum value of a multi-dimensional array. |
maxind | Returns the index of the first occurrence of a maximum value. |
min | Computes the minimum value of a multi-dimensional array. |
minind | Returns the index of the first occurrence of a minimum value. |
mixed_layer_depth | Calculates a quantity derived from the Potential Density of significance. (Documentation under construction.) |
mixhum_ptd | Calculates the mixing ratio or specific humidity given pressure and dew point temperature. |
mixhum_ptrh | Calculates the mixing ratio or specific humidity given pressure, temperature and relative humidity. |
mjo_cross_coh2pha | Calculate space-time coherence-squared and phase using the array returned by mjo_cross_segment . |
mjo_cross_segment | Calculate space-time cross spectrum for a single time segment. |
moc_globe_atl | Facilitates calculating the meridional overturning circulation for the globe and Atlantic. |
monthday | Calculates a concatenated month_day given a day and year. |
namedcolor2rgb | Returns the RGB triplets of the given list of named colors. |
namedcolor2rgba | Returns the RGBA quadruplets of the given list of named colors. |
natgrid | Interpolates data from an unstructured (randomly-spaced) grid to a rectilinear grid using natural neighbor interpolation. |
natgridd | Interpolates double data on an unstructured grid to a rectilinear grid. (Deprecated version.) |
natgrids | Interpolates float data on an unstructured grid to a rectilinear grid. (Deprecated version.) |
ncargpath | Returns the absolute pathnames of various NCAR Graphics directories. |
ncargversion | Prints the NCAR Graphics version, copyright, trademark and general licensing terms. |
ndctodata | Converts normalized device coordinates (NDCs) into data coordinates. |
ndtooned | Converts a multi-dimensional array to a one-dimensional array. |
new | Creates an NCL variable. |
NewList | Create a list (type variable). |
ngezlogo | Draws the NCAR logo in the lower right corner of the given workstation. |
nggcog | Calculates the latitudes and longitudes of a set of points approximating a circle at a given point on the surface of the globe. |
nggetp | Retrieves values for various parameters for the NCAR ngezlogo procedure. |
nglogo | Draws various NCAR and UCAR logos on the given workstation. |
ngsetp | Sets values for various parameters for the NCAR ngezlogo procedure. |
NhlAddAnnotation | Add annotations to a plot object as an external annotation. |
NhlAddData | Adds one or more additional data items to a plot. |
NhlAddOverlay | Overlays one plot object on another. |
NhlAddPrimitive | Adds a Primitive object to an existing plot. |
NhlAppGetDefaultParentId | Returns a reference to the current default App object. |
NhlChangeWorkstation | Changes the output workstation of one or more NCL View objects. |
NhlClassName | Retrieve the class name of one or more NCL objects. |
NhlClearWorkstation | Clears the given workstation objects. |
NhlDataPolygon | Draws a polygon using data coordinates. |
NhlDataPolyline | Draws a polyline using data coordinates. |
NhlDataPolymarker | Draws polymarkers using data coordinates. |
NhlDataToNDC | Converts data units into normalized device coordinates (NDCs). |
NhlDestroy | Destroys objects from NCL. |
NhlDraw | Draws the given graphical objects. |
NhlFrame | Updates and clears the given workstation objects. |
NhlFreeColor | Removes one or more color entries from one or more workstations. |
NhlGetBB | Retrieves the bounding boxes of a list of NCL objects. |
NhlGetClassResources | Returns a list of resources associated with the given class name and an optional filter string. |
NhlGetErrorObjectId | Returns a reference to the current Error object. |
NhlGetNamedColorIndex | Returns color map indexes that match the given color names in the color maps of the given workstations. |
NhlGetParentId | Returns the ids of the parent ids of the given objects. |
NhlGetParentWorkstation | Returns the ids of the parent workstations of the given objects. |
NhlGetWorkspaceObjectId | Returns a reference to the current Workspace object. |
NhlIsAllocatedColor | Queries a list of workstations to determine whether or not the given color indexes have been allocated. |
NhlIsApp | Returns True for each given object that is an App object. |
NhlIsDataComm | Returns True for each given object that is a DataComm object. |
NhlIsDataItem | Returns True for each given object that is a DataItem object. |
NhlIsDataSpec | Returns True for each given object that is a DataSpec object. |
NhlIsTransform | Returns True for each given object that is a Transform object. |
NhlIsView | Returns True for each given object that is a View object. |
NhlIsWorkstation | Returns True for each given object that is a Workstation object. |
NhlName | Retrieves the name of one or more NCL objects. |
NhlNDCPolygon | Draws a polygon using NDC (Normalized Device Coordinate) units. |
NhlNDCPolyline | Draws a polyline using NDC (Normalized Device Coordinate) units. |
NhlNDCPolymarker | Draws polymarkers using NDC (Normalized Device Coordinate) units. |
NhlNDCToData | Converts normalized device coordinates (NDCs) into data coordinates. |
NhlNewColor | Allocates new workstation color indexes. |
NhlNewDashPattern | Adds new dash patterns to the existing table of dash patterns. |
NhlNewMarker | Adds new markers to the existing table of markers. |
NhlPalGetDefined | Returns a list of available color maps. |
NhlRemoveAnnotation | Remove annotations from the plot they are registered in. |
NhlRemoveData | Removes data items from one or more plots. |
NhlRemoveOverlay | Removes one or more plots from an overlay. |
NhlRemovePrimitive | Removes one or more primitives from the given Transform object. |
NhlSetColor | Sets the colors for a given list of color indexes and workstations. |
NhlSetDashPattern | Sets the dash patterns for a given list of dash pattern indexes and workstations. |
NhlSetMarker | Sets the markers for a given list of marker indexes and workstations. |
NhlUpdateData | Forces the DataComm instances to update their internal states. |
NhlUpdateWorkstation | Updates the given workstation objects. |
nice_mnmxintvl | Calculates "nice" values for endpoints and spacing to be used for creating a series of equally-spaced levels through the data domain. |
nngetaspectd | Retrieves an aspect at a specified coordinate position. |
nngetaspects | Retrieves an aspect at a specified coordinate position. |
nngetp | Retrieves control parameters for Natgrid routines. |
nngetsloped | Retrieves a slope at a specified coordinate position. |
nngetslopes | Retrieves a slope at a specified coordinate position. |
nngetwts | Retrieves natural neighbors and weights for the function values at those neighbors. |
nngetwtsd | Retrieves natural neighbors and weights for the function values at those neighbors. |
nnpnt | Interpolates from 2D random data to get values at a specified set of points. |
nnpntd | Interpolates from 2D random double data to get values at a specified set of points. (Deprecated version.) |
nnpntend | Terminates interpolation from 2D random data to get values at a specified set of points. |
nnpntendd | Terminates interpolation from 2D random data to get values at a specified set of points. |
nnpntinit | Initializes internal quantities, for given input data, to allow subsequent nnpnt calls to interpolate at specified points. |
nnpntinitd | Initializes internal quantities, for given input data, to allow subsequent nnpntd calls to interpolate at specified points. |
nnpntinits | Initializes internal quantities, for given input data, to allow subsequent nnpnts calls to interpolate at specified points. |
nnpnts | Interpolates from 2D random float data to get values at a specified set of points. (Deprecated version.) |
nnsetp | Sets control parameters for Natgrid routines. |
num | Counts the number of True values in the input. |
obj_anal_ic | Iterative improvement objective analysis. |
omega_ccm | Calculates omega [vertical pressure velocity] using the model diagnostic method. |
onedtond | Converts a one-dimensional array to a multi-dimensional array. |
overlay | Overlays one plot object on another. |
paleo_outline | Creates continental outlines from model orography data. |
pdfxy_bin | Performs looping necessary to calculate the bivariate (joint) probability distribution (see pdfxy). |
poisson_grid_fill | Replaces all missing (_FillValue) values in a grid with values derived from solving Poisson's equation via relaxation. |
pop_remap | Regrids a POP ocean model grid to another grid. |
potmp_insitu_ocn | Calculate seawater potential temperature at an arbitrary reference pressure given insitu temperature, salinity and depth. |
prcwater_dp | Computes column precipitable water of the rightmost dimension. |
pres2hybrid | Interpolates data on constant pressure levels to hybrid levels. |
pres_hybrid_ccm | Calculates pressure at the hybrid levels. |
pres_hybrid_jra55 | Calculates the "full" hybrid pressure levels for models using the Simmons/Burridge formulations (eg: Japanese ReAnalysis). |
pres_sigma | Calculates the pressure at specified sigma levels. |
Prints the value of a variable or expression. | |
print_table | Prints formatted elements from a list to stdout. |
printFileVarSummary | Prints a summary of a file variable's information. |
printVarSummary | Prints a summary of a variable's information. |
product | Computes the product of the input. |
pslec | Computes sea level pressure from CCM/CAM hybrid model variables using the ECMWF formulation. |
pslhor | Computes sea level pressure from CCM/CAM hybrid model variables using the ECMWF formulation and Trenberth's horizontal correction. |
pslhyp | Computes sea level pressure using the hypsometric equation. |
qsort | Sorts a singly dimensioned array. |
rand | Generates a pseudo-random number. |
random_chi | Generates random numbers using a chi-squared distribution. |
random_gamma | Generates random numbers using a gamma distribution. |
random_normal | Generates random numbers using a normal distribution. |
random_setallseed | Sets initial seeds for random number generators. |
random_uniform | Generates random numbers using a uniform range distribution. |
rcm2points | Interpolates data on a curvilinear grid (i.e. RCM, WRF, NARR) to an unstructured grid. |
rcm2rgrid | Interpolates data on a curvilinear grid (i.e. RCM, WRF, NARR) to a rectilinear grid. |
rdsstoi | Reads weekly/monthly compocp site and climatology grids. |
read_colormap_file | Reads an NCL system colormap file or a user-defined colormap. |
reg_multlin | Performs basic multiple linear regression analysis. |
regcoef | Calculates the linear regression coefficient between two variables. |
regCoef | Calculates the linear regression coefficient between two variables. |
regCoef_n | Calculates the linear regression coefficient between two variables on the given dimensions. |
regline | Calculates the linear regression coefficient between two series. |
relhum | Calculates relative humidity given temperature, mixing ratio, and pressure. |
relhum_ice | Calculates relative humidity with respect to ice, given temperature, mixing ratio, and pressure. |
relhum_water | Calculates relative humidity with respect to water, given temperature, mixing ratio, and pressure. |
replace_ieeenan | Changes all occurrences of IEEE NaN to a user-specified value. |
reshape | Reshapes a multi-dimensional array to another multi-dimensional array. |
reshape_ind | Places values from a smaller one-dimensional array to a larger one-dimensional array, and reshapes it. |
rgbhls | Converts RGB color values to HLS. |
rgbhsv | Converts RGB color values to HSV. |
rgbyiq | Converts RGB color values to YIQ values. |
rgrid2rcm | Interpolates data on a rectilinear lat/lon grid to a curvilinear grid like those used by the RCM, WRF and NARR models/datasets. |
rhomb_trunc | Performs rhomboidal truncation on spherical harmonic coefficients. |
rhomb_trunC | Performs rhomboidal truncation on spherical harmonic coefficients. |
rip_cape_2d | Computes convective available potential energy (CAPE), convective inhibition (CIN), lifted condensation level (LCL), and level of free convection (LFC) (deprecated version). |
rip_cape_3d | Computes convective available potential energy (CAPE) and convective inhibition (CIN) (deprecated version). |
round | Rounds a float or double variable to the nearest whole number. |
rtest | Determines the statistical significance of a linear correlation coefficient. |
runave | Calculates an unweighted running average on the rightmost dimension. |
runave_n | Calculates an unweighted running average on the given dimension. |
set_default_fillvalue | Sets the default missing value for the given variable type. |
set_sphere_radius | Sets the radius of a sphere used in spherical harmonic routines. |
setfileoption | Sets a number of file-format-specific options. |
sfvp2uvf | Computes the wind components given stream function and velocity potential (on a fixed grid) via spherical harmonics. |
sfvp2uvg | Computes the wind components given stream function and velocity potential (on a gaussian grid) via spherical harmonics. |
shaeC | Computes spherical harmonic analysis of a scalar field on a fixed grid via spherical harmonics. |
shaec | Computes spherical harmonic analysis of a scalar field on a fixed grid via spherical harmonics. |
shagC | Computes spherical harmonic analysis of a scalar field on a gaussian grid via spherical harmonics. |
shagc | Computes spherical harmonic analysis of a scalar field on a gaussian grid via spherical harmonics. |
shgetnp | Finds the nearest point, or points (in a specified set of points), to a given point in 3-space. |
shgetp | Retrieves control parameters for Shgrid routines. |
shgrid | Interpolates data from an unstructured grid to a grid in 3-space. |
shorttobyte | Coerces values of type short to values of type byte. |
shorttochar | Coerces values of type short to values of type character. |
shorttocharacter | Coerces values of type short to values of type character. |
show_ascii | Prints the ASCII table to the screen. |
shsec | Computes spherical harmonic synthesis of a scalar quantity on a fixed grid via spherical harmonics. |
shseC | Computes the spherical harmonic synthesis of a scalar quantity on a fixed grid via spherical harmonics. |
shsetp | Sets control parameters for Shgrid routines. |
shsgc | Computes spherical harmonic synthesis of a scalar quantity on a gaussian grid via spherical harmonics. |
shsgC | Computes the spherical harmonic synthesis of a scalar quantity on a gaussian grid via spherical harmonics. |
shsgc_R42 | Computes spherical harmonic synthesis of a scalar quantity via rhomboidally truncated (R42) spherical harmonic coefficients onto a (108x128) gaussian grid. |
sigma2hybrid | Interpolates from sigma to hybrid coordinates. |
simpeq | Integrate a sequence of equally spaced points using Simpson's Rule. |
simpne | Integrates a sequence of unequally or equally spaced points using Simpson's three-point formula. |
sin | Computes the sine of numeric types. |
sindex_yrmo | Calculates the Southern Oscillation Index given two series of year-month values. |
sinh | Computes the hyperbolic sine of numeric types. |
sizeof | Returns the total size, in bytes, of the input variable. |
sleep | Pauses execution of NCL scripts for a specified number of seconds. |
smth9 | Performs nine point local smoothing on one or more 2D grids. |
snindex_yrmo | Calculates the Southern Oscillation Index and the noise index given two series of year-month values. |
solve_linsys | Computes the solution to a real system of linear equations. |
span_color_indexes | Given the number of desired color values, return an array of indexes that nicely span the given color map. |
span_color_rgba | Given the number of desired color values, return an array of RGB triplets or RGBA quadruplets that nicely span the given color map. |
span_named_colors | Returns an RGB array that is a span between given list of named colors. |
sparse_matrix_mult | Multiplies a sparse matrix with a dense matrix. |
spcorr | Computes Spearman rank order correlation (Rho) correlation coefficient. |
spcorr_n | Computes Spearman rank order correlation (Rho) correlation coefficient across the given dimension. |
specx_anal | Calculates spectra of a series. |
specxy_anal | Calculates cross spectra quantities of a series. |
sprintf | Converts floats or doubles into formatted strings. |
sprinti | Converts integers into formatted strings. |
sqrt | Computes the square root of its input. |
sqsort | Sorts a singly dimensioned arrays of strings. |
srand | Establishes a seed for the rand function. |
stat2 | Calculates the first two moments of the given input. |
stat4 | Calculates estimates of the first four moments (mean, variance, skewness, and kurtosis) of the given input. |
stat_medrng | Calculates median, range, and mid-range of the given input. |
stat_trim | Calculates trimmed estimates of the first two moments of the given input. |
status_exit | Exits an NCL script passing a status code to the calling environment. |
stdatmus_p2tdz | Calculates the corresponding temperature, density, and height based on the 1976 U.S. standard atmosphere, given the pressure. |
stdatmus_z2tdp | Calculates the corresponding temperature, density, and pressure based on the 1976 U.S. standard atmosphere, given the height. |
stddev | Calculates the sample standard deviation. |
str_capital | Capitalizes all words in each string. |
str_concat | Concatenates all strings into a single string. |
str_fields_count | Counts the number of fields separated by the given delimiters in an array of strings. |
str_get_cols | Returns an array of substrings, given a start and end index into the given string. |
str_get_dq | Returns the double quote (") character as a string. |
str_get_field | Returns an array of substrings given a field number and a combination of delimiters. |
str_get_nl | Returns the newline (\n) character as a string. |
str_get_sq | Returns the single quote (') character as a string. |
str_get_tab | Returns the tab ('\t' in C) character as a string. |
str_index_of_substr | Returns the start indexes where one or more occurrences of a substring is found in a string. |
str_insert | Inserts a substring into the given strings. |
str_is_blank | Returns True for strings that contain all blanks. |
str_join | Joins all strings into one string, with each string separated by delimiter. |
str_left_strip | Strips leading spaces and TABs from the input strings. |
str_lower | Converts all input strings to lowercase. |
str_match | Returns a list of strings that contain the given substring (case sensitive). |
str_match_bool | Returns a logical array of True/False/Missing indicating where the input array of strings contain the given substring (case sensitive). |
str_match_bool_ic | Returns a logical array of True/False/Missing indicating where the input array of strings contain the given substring (case insensitive). |
str_match_ic | Returns a list of strings that contain the given substring (case insensitive). |
str_match_ic_regex | Returns a list of strings that contain the given substring (case insensitive), allowing for regular expressions. |
str_match_ind | Returns a list of indexes into an array of strings that contain the given substring (case sensitive). |
str_match_ind_ic | Returns a list of indexes into an array of strings that contain the given substring (case insensitive). |
str_match_ind_ic_regex | Returns a list of indexes into an array of strings that contain the given substring (case insensitive), allowing for regular expressions. |
str_match_ind_regex | Returns a list of indexes into an array of strings that contain the given substring (case sensitive), allowing for regular expressions. |
str_match_regex | Returns a list of strings that contain the given substring (case sensitive), allowing for regular expressions. |
str_right_strip | Strips ending spaces and TABs from the input strings. |
str_split | Splits a string into an array of strings given one or more delimiters. |
str_split_by_length | Splits a string or strings into an array of strings given a length, or an array of lengths. |
str_split_csv | Splits strings into an array of strings using the given delimiter. |
str_squeeze | Strips off leading and ending spaces and TABs, and replaces multiple spaces and/or TABs with a single space. |
str_strip | Strips leading and ending spaces and TABs from the input strings. |
str_sub_str | Replaces a substring with a new substring. |
str_switch | Switches the case of characters in the given string(s). |
str_upper | Converts all input strings to uppercase. |
stringtochar | Coerces values of type string to values of type character. |
stringtocharacter | Coerces values of type string to values of type character. |
stringtodouble | Coerces values of type string to values of type double. |
stringtofloat | Coerces values of type string to values of type float. |
stringtoint | Coerces values of type string to values of type integer. |
stringtointeger | Coerces values of type string to values of type integer. |
stringtolong | Coerces values of type string to values of type long. |
stringtoshort | Coerces values of type string to values of type short. |
strlen | Returns the length of a string variable. |
student_t | Calculates the two-tailed probability of the Student-t distribution. |
subprocess | Executes a shell command as a concurrent subprocess to NCL. |
subprocess_wait | Checks the finish-status of a concurrent process launched by the subprocess command. Can optionally wait for the subprocess to finish. |
sum | Sums the input. |
svd_lapack | Calculates the singular value decomposition of a general rectangular matrix. |
svdcov | Uses singular value decomposition and returns the left and right homogeneous and heterogeneous arrays associated with the two input datasets. |
svdcov_sv | Uses singular value decomposition to return the left and right singular vectors associated with the two input datasets. |
svdstd | Uses singular value decomposition and returns the left and right homogeneous and heterogeneous arrays associated with the two input datasets. |
svdstd_sv | Uses singular value decomposition to return the left and right singular vectors associated with the two input datasets. |
system | Executes a shell command. |
systemfunc | Executes a shell command and returns the output. |
tan | Computes the tangent of numeric types. |
tanh | Computes the hyperbolic tangent of numeric types. |
taper | Applies split-cosine-bell tapering to one or more series across the rightmost dimension. |
taper_n | Applies split-cosine-bell tapering to one or more series across the given dimension. |
tdclrs | Defines a set of colors for use with selected TDPACK routines. |
tdctri | Cuts the triangles in a triangle list with a plane perpendicular to an axis (for use with selected TDPACK routines). |
tdcudp | Not yet implemented. |
tdcurv | Draws the projection of a curve defined by an array of points in 3-space. |
tddtri | Draws triangles defined by a triangle list (for use with selected TDPACK routines). |
tdez2d | Draws a surface on the specified workstation. |
tdez3d | Draws an isosurface on the specified workstation. |
tdgetp | Retrieves TDPACK parameter values. |
tdgrds | Draws perimeters, ticks, and grid lines on the six sides of a box (for use with selected TDPACK routines). |
tdgrid | Draws a grid on a particular face of a box in 3-space (for use with selected TDPACK routines). |
tdgtrs | Gets the definition of a specified rendering style (for use with selected TDPACK routines). |
tdinit | Defines eye position, line of sight, up direction, and stereo flag for selected TDPACK routines. |
tditri | Adds triangles defining an isosurface to a triangle list (for use with selected TDPACK routines). |
tdlbla | Draws labels for a particular face of a box in 3-space (for use with selected TDPACK routines). |
tdlblp | Not yet implemented. |
tdlbls | Draws labels for all faces of a box in 3-space (for use with selected TDPACK routines). |
tdline | Draws the projection of a solid line in 3-space (for use with selected TDPACK routines). |
tdlndp | Not yet implemented. |
tdlnpa | Draws the projection of a line joining two points in the reference parallelogram (for use with selected TDPACK routines). |
tdlpdp | Not yet implemented. |
tdmtri | Adds triangles defining a 3D marker to a triangle list for use with selected TDPACK routines. |
tdotri | Orders the triangles in a triangle list for proper rendering (for use with selected TDPACK routines). |
tdpara | Defines the reference parallelogram for use with selected TDPACK routines. |
tdplch | Draws a string in the plane of the reference parallelogram (for use with selected TDPACK routines). |
tdprpa | Retrieves the coordinates of a projection in the projection plane, given the parallelogram coordinates of a point (for use with selected TDPACK routines). |
tdprpi | Retrieves the parallelogram coordinates of a point in the reference parallelogram, given a point in the projection plane (for use with selected TDPACK routines.) |
tdprpt | Retrieves the coordinates of its projection in the projection plane, given the coordinates of a point in 3-space (for use with selected TDPACK routines). |
tdsetp | Sets TDPACK parameter values. |
tdsort | Sorts an array (for use with selected TDPACK routines). |
tdstri | Adds triangles defining a simple surface to a triangle list (for use with selected TDPACK routines). |
tdstrs | Sets the values defining a selected rendering style (for use with selected TDPACK routines). |
tdttri | Adds triangles defining a trajectory to a triangle list (for use with selected TDPACK routines). |
thornthwaite | Estimate the potential evapotranspiration (PET) via the Thornthwaite method. |
tobyte | Converts values of any snumeric data type or string to values of type (NCL) byte (unsigned char). |
tochar | Converts values of any snumeric data type or string to values of type char. |
todouble | Converts values of any snumeric data type or string to values of type double. |
tofloat | Converts values of any snumeric data type or string to values of type float. |
toint | Converts values of any snumeric data type or string to values of type integer. |
toint64 | Converts values of any snumeric data type or string to values of type int64 (64 bit long, or long long). |
tointeger | Converts values of any snumeric data type or string to values of type integer. |
tolong | Converts values of any snumeric data type or string to values of type long. |
toshort | Converts values of any snumeric data type or string to values of type short. |
tosigned | Converts any kind of 8/16/32/64 integers to its corresponding signed integers. |
tostring | Converts values of any snumeric data type to values of type string. |
tostring_with_format | Converts values of any snumeric data type to values of type string, with specified format. |
totype | Converts values of any snumeric data type or string to values of the given type. |
toubyte | Converts values of any snumeric data type or string to values of type unsigned byte. |
touint | Converts values of any snumeric data type or string to values of type unsigned integer. |
touint64 | Converts values of any snumeric data type or string to values of type uint64 (unsigned 64 bit long, or unsigned long long). |
toulong | Converts values of any snumeric data type or string to values of type unsigned long. |
tounsigned | Converts any kind of 8/16/32/64 integers to its corresponding unsigned integers. |
toushort | Converts values of any snumeric data type or string to values of type unsigned short. |
trend_manken | Calculates Mann-Kendall non-parametric test for monotonic trend and the Theil-Sen robust estimate of linear trend. |
tri_trunC | Performs triangular truncation on spherical harmonic coefficients. |
tri_trunc | Performs triangular truncation on spherical harmonic coefficients. |
triple2grid | Places unstructured (randomly-spaced) data onto the nearest locations of a rectilinear grid. |
triple2grid2d | Places unstructured (randomly-spaced) data onto the nearest locations of a curvilinear grid. |
trop_wmo | Determines the level of the thermal tropopause. |
ttest | Returns an estimate of the statistical significance and, optionally, the t-values. |
typeof | Returns the string name of the type of the input variable. |
undef | Undefines defined NCL symbols (functions, procedures, variables). |
unique_string | Returns a unique string given the input string as a prefix. |
update | Updates the given workstation objects. |
ushorttoint | Coerces values of type unsigned short to values of type integer. |
ut_calendar | Converts a mixed Julian/Gregorian date to a UT-referenced date (deprecated; use cd_calendar). |
ut_calendar_fix | Converts a mixed Julian/Gregorian date to a UT-referenced date (temporary function; see the 6.4.0 release notes for details). |
ut_inv_calendar | Converts a UT-referenced date to a mixed Julian/Gregorian date (deprecated; use cd_inv_calendar). |
ut_inv_calendar_fix | Converts a UT-referenced date to a mixed Julian/Gregorian date (temporary function; see the 6.4.0 release notes for details). |
utm2latlon | Converts from UTM to lat/lon using a specified datum. |
uv2dv_cfd | Computes divergence using centered finite differences. |
uv2dvf | Computes the divergence using spherical harmonics given the u and v wind components on a fixed grid. |
uv2dvF | Computes the divergence using spherical harmonics given the u and v wind components on a fixed grid. |
uv2dvg | Computes the divergence using spherical harmonics given the u and v wind components on a gaussian grid. |
uv2dvG | Computes the divergence using spherical harmonics given the u and v wind components on a gaussian grid. |
uv2sfvpF | Computes the stream function and velocity potential via spherical harmonics given u and v on a fixed grid. |
uv2sfvpf | Computes the stream function and velocity potential via spherical harmonics given u and v on a fixed grid. |
uv2sfvpG | Computes the stream function and velocity potential via spherical harmonics given u and v on a gaussian grid. |
uv2sfvpg | Computes the stream function and velocity potential via spherical harmonics given u and v on a gaussian grid. |
uv2vr_cfd | Computes relative vorticity using centered finite differences. |
uv2vrdvF | Computes the vorticity and divergence via spherical harmonics, given the u and v wind components on a fixed grid. |
uv2vrdvf | Computes the vorticity and divergence via spherical harmonics, given the u and v wind components on a fixed grid. |
uv2vrdvG | Computes the vorticity and divergence via spherical harmonics, given the u and v wind components on a gaussian grid. |
uv2vrdvg | Computes the vorticity and divergence via spherical harmonics, given the u and v wind components on a gaussian grid. |
uv2vrF | Computes the vorticity via spherical harmonics, given the u and v wind components on a fixed grid. |
uv2vrf | Computes the vorticity via spherical harmonics, given the u and v wind components on a fixed grid. |
uv2vrG | Computes the vorticity via spherical harmonics, given the u and v wind components on a gaussian grid. |
uv2vrg | Computes the vorticity via spherical harmonics, given the u and v wind components on a gaussian grid. |
v5d_close | Closes a Vis5D+ format file. |
v5d_create | Creates a Vis5D+ format file. |
v5d_setLowLev | Sets the lowest vertical offset, in grid level, for each 3-dimensional gridded variable in a Vis5D+ format file. |
v5d_setUnits | Sets a name for physical units for a variable in a Vis5D+ format file. |
v5d_write | Writes compressed data to a Vis5D+ format file. |
v5d_write_var | Writes a single 3-dimensional gridded variable to a Vis5D+ format file. |
variance | Computes an unbiased estimate the variance of all input points. |
vhaeC | Computes vector spherical harmonic analysis of vector fields on a fixed grid via spherical harmonics. |
vhaec | Computes vector spherical harmonic analysis of vector fields on a fixed grid via spherical harmonics. |
vhagC | Computes vector spherical harmonic analysis of vector fields on a gaussian grid via spherical harmonics. |
vhagc | Computes vector spherical harmonic analysis of vector fields on a gaussian grid via spherical harmonics. |
vhseC | Computes vector spherical harmonic syntheses of vector fields on a fixed grid via spherical harmonics. |
vhsec | Computes vector spherical harmonic syntheses of vector fields on a fixed grid via spherical harmonics. |
vhsgc | Computes vector spherical harmonic syntheses of vector fields on a gaussian grid via spherical harmonics. |
vhsgC | Computes vector spherical harmonic syntheses of vector fields on a gaussian grid via spherical harmonics. |
vibeta | Performs vertical integration using beta factors. |
vinth2p | Interpolates CAM (Community Atmosphere Model) hybrid coordinates to pressure coordinates. |
vinth2p_ecmwf | Interpolates CESM hybrid coordinates to pressure coordinates but uses an ECMWF formulation to extrapolate values below ground. |
vinth2p_ecmwf_nodes | Interpolates CESM hybrid coordinates to pressure coordinates but uses an ECMWF formulation to extrapolate values below ground. |
vinth2p_nodes | Interpolates CESM hybrid coordinates to pressure coordinates on an unstructured grid. |
vintp2p_ecmwf | Interpolates data at multidimensional pressure levels to constant pressure coordinates and uses an ECMWF formulation to extrapolate values below ground. |
vr2uvf | Computes the rotational wind components via spherical harmonics, given an array containing relative vorticity on a fixed grid. |
vr2uvF | Computes the rotational wind components via spherical harmonics, given an array containing relative vorticity on a fixed grid. |
vr2uvg | Computes the rotational wind components via spherical harmonics, given an array containing relative vorticity on a gaussian grid. |
vr2uvG | Computes the rotational wind components via spherical harmonics, given an array containing relative vorticity on a gaussian grid. |
vrdv2uvf | Computes the wind components via spherical harmonics, given vorticity and divergence on a fixed grid. |
vrdv2uvF | Computes the wind components via spherical harmonics, given vorticity and divergence on a fixed grid. |
vrdv2uvg | Computes the wind components via spherical harmonics, given vorticity and divergence on a gaussian grid. |
vrdv2uvG | Computes the wind components via spherical harmonics, given vorticity and divergence on a gaussian grid. |
wavelet | Calculates the wavelet transform of a time series and significance levels. |
wavelet_default | Calculates the wavelet transform of a time series and significance levels. |
weibull | Derives the shape and scale parameters for the Weibull distribution via maximum likelihood estimates. |
wetbulb | Compute wetbulb temperature. |
wgt_area_smooth | Smooths an array of data using a 5-point 2D area-weighted smoothing algorithm. |
wgt_areaave | Calculates the area average of a quantity using weights. |
wgt_areaave2 | Calculates the area average of a quantity using two-dimensional weights. |
wgt_arearmse | Calculates a weighted area root-mean-square-difference between two variables. |
wgt_arearmse2 | Calculates a weighted area root-mean-square-difference (rmse) between two variables using two-dimensional weights. |
wgt_areasum2 | Calculates the area sum (total) of a quantity using two-dimensional weights. |
wgt_runave | Calculates a weighted running average across the rightmost dimension. |
wgt_runave_n | Calculates a weighted running average across the given dimension. |
wgt_vert_avg_beta | Computes weighted vertical average or sum using pressure thickness and beta factors. |
wgt_volave | Calculates the volume average of a quantity using weights. |
wgt_volave_ccm | Calculates the volume average of a quantity from the CCM using weights. |
wgt_volrmse | Calculates a weighted volume root-mean-square-difference between two variables. |
wgt_volrmse_ccm | Calculates a weighted volume root-mean-square-difference between two variables from the CCM. |
where | Performs array assignments based on a conditional array. |
wk_smooth121 | Performs a specialized 1-2-1 filter for Wheeler-Kiladis plots. |
wmbarb | Draws wind barbs on the given workstation. |
wmbarbmap | Draws wind barbs over maps. |
wmdrft | Draws weather front lines on the given workstation. |
wmgetp | Retrieves parameter values for selected Wmap routines. |
wmlabs | Plots special symbols and icons for daily weather. |
wmsetp | Sets parameter values for selected Wmap routines. |
wmstnm | Plots station model data on the given workstation. |
wmvect | Draws vectors on the given workstation. |
wmvectmap | Draws vectors over maps. |
wmvlbl | Draws an informational label box for plots produced by wmvect or wmvectmap. |
wrf_avo | Calculates absolute vorticity from WRF model output. |
wrf_cape_2d | Computes maximum convective available potential energy (CAPE), maximum convective inhibition (CIN), lifted condensation level (LCL), and level of free convection (LFC). |
wrf_cape_3d | Computes convective available potential energy (CAPE) and convective inhibition (CIN). |
wrf_dbz | Calculates simulated equivalent radar reflectivity factor [dBZ] from WRF model output. |
wrf_eth | Calculates equivalent potential temperature from WRF model output. |
wrf_helicity | Calculates storm relative helicity from WRF model output. |
wrf_ij_to_ll | Finds the nearest longitude, latitude locations to the specified model grid indices (i,j). |
wrf_interp_1d | Linearly interpolates a one-dimensional variable in the vertical. |
wrf_interp_2d_xy | Extracts a cross section from a given input field. |
wrf_interp_3d_z | Interpolates to a specified pressure/height level. |
wrf_latlon_to_ij | Finds the nearest model grid indices (i,j) to the specific location(s) in latitude and longitude (deprecated). |
wrf_ll_to_ij | Finds the nearest model grid indices (i,j) to the specified location(s) in longitude and latitude. |
wrf_omega | Calculates approximate omega in C, given vertical velocity, water vapor mixing ratio, temperature, and pressure from WRF model output. |
wrf_pvo | Calculates potential vorticity from WRF model output. |
wrf_rh | Calculates relative humidity from ARW WRF model output. |
wrf_slp | Calculates sea level pressure from ARW WRF model output. |
wrf_smooth_2d | Smooths a given field. |
wrf_td | Calculates dewpoint temperature in [C] from ARW WRF model output. |
wrf_tk | Calculates temperature in [K] from ARW WRF model output. |
wrf_updraft_helicity | Calculates updraft helicity from WRF model output. |
wrf_uvmet | Rotates u,v components of the wind to earth coordinates. |
wrf_virtual_temp | Calculates virtual temperature, given temperature and mixing ratio from WRF model output. |
wrf_wetbulb | Calculates wet bulb temperature in K, given pressure in temperature in K and mixing ratio in kg/kg from WRF model output. |
wrf_wps_close_int | Closes a currently open WPS intermediate file. |
wrf_wps_open_int | Opens a WPS intermediate file and returns a status. |
wrf_wps_rddata_int | Reads a 2D field from an open WPS intermediate file. |
wrf_wps_rdhead_int | Reads header information for the current field of an open WPS intermediate file. |
wrf_wps_read_int | Reads data from a WPS intermediate file. |
wrf_wps_write_int | Writes data to a WPS intermediate file. |
write_matrix | Writes nicely-formatted integer, float, or double precision two-dimensional (2D) arrays to standard out or to a file. |
write_table | Writes formatted elements from a list to an ASCII file. |
yiqrgb | Converts YIQ color values to RGB. |
z2geouv | Computes the geostrophic zonal and meridional wind components using geopotential height on isobaric levels (rectilinear grid only). |
zonal_mpsi | Computes a zonal mean meridional stream function. |