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 | Z
abs 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.
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 statements (CLAs) 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.
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 of a series of correlated observations.
erf Evaluates the real error function.
erfc Evaluates the real complementary error function.
esacr Computes sample auto-correlations.
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 variable on a supported file.
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_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.
getfiledimsizes Returns a list of dimension sizes of the given file variable.
getfilegrpnames Returns an array of file group names in the specified supported file.
getfilepath Returns a string of the opened file's path.
getfilevaratts Returns all attribute names associated with a variable on a supported file.
getfilevarchunkdimsizes Returns the chunk dimension sizes of variable on a file (which has chunk dimensions).
getfilevardims Returns all dimension names associated with a variable on a supported file.
getfilevardimsizes Returns the dimension sizes of variable on a supported file.
getfilevarnames Returns an array of file variable names in the specified supported file.
getfilevartypes Returns the types of the named variables stored in the given supported file.
getvaratts Returns a list of attribute names for the given variable or file pointer.
getvardims Returns a list of dimension names for the given 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.
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.
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.
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.
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.
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 levels for the 60-level Japanese ReAnalysis.
pres_sigma Calculates the pressure at specified sigma levels.
print Prints the value of a variable or expression.
print_table Prints all 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_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.
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_inv_calendar Converts a UT-referenced date to a mixed Julian/Gregorian date (deprecated; use cd_inv_calendar).
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 all elements from a list (to a 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.