Converts normalized device coordinates (NDCs) into data coordinates.
procedure NhlNDCToData ( plot  : graphic, x_in [*] : float, y_in [*] : float, x_out [*] : float, y_out [*] : float )
One-dimensional arrays of x and y normalized device coordinates (NDCs). They must be the same length.x_out
One-dimensional arrays of the same size as x_in and y_in. These will contain the x and y data coordinate output values. For map plots, x_out corresponds to longitude values, and y_out corresponds to latitude values.
The NhlNDCToData procedure uses the built-in transformation mapping feature of NCL plot objects to map NDCs (normalized device coordinates) into data coordinates.
The NhlNDCToData procedure maps coordinate pairs from x_in and y_in and places the results in the corresponding elements of x_out and y_out, respectively. Both x_out and y_out can be the same variables as x_in and y_in.
When the data coordinates are outside the NDC viewport specified in the plot, a missing value is placed in both of the corresponding indexes in the output arrays. The missing value chosen is either the x_in missing value, y_in missing value, or a system default.
See the examples for ndctodata.