idsfft

This function is used to call the NCAR 3.2 Fortran function IDSFFT.

Synopsis

	function idsfft( 
		dim0[*]:float,
		dim1[*]:float,
		values[*]:float,
		dimensions[2]:integer
	)

Arguments

dim0
A single-dimension array of four or more coordinates that represent dimension 0 of output.
dim1
A single-dimension array of four or more coordinates that represent dimension 1 of output, must be same dimension size of dim0.
values
A single-dimension array of four or more values at coordinates (dim0,dim1)with the same dimension size as dim0 and dim1.
dimensions
A single-dimension array of size 2 containing the requested output dimensions for dimensions 0 and 1, respectively.

Description

idsfft performs smooth surface fitting when the projections of the data points in the X-Y plane are irregularly distributed in the plane. dim0 and dim1 are randomly spaced coordinates in the X-Y plane, and values contains the values at each X-Y coordinate pair. No two coordinates (dim0,dim1) can be equal to each other. If this condition occurs, idsfft prints an error message.

NOTE: This function no longer exits when an error occurs.

idsfft returns a float array sized by the values specified in the dimensions parameter. The range of coordinates are determined by taking the min and max values of dim0 and dim1, and dividing the range by the size of the requested dimension. The dim0 values define the coordinate range of the first dimension (dimension #0) of the output array, and the dim1 values determine the coordinate range of the second dimension (dimension #1). The output variable returned contains the derived coordinate variables (See Coordinate variables description). Dimension 0 of the output is named "ncl0" and dimension 1 of the output is named "ncl1". For more information, see the NCAR Graphics Version 3.2 man page for IDSFFT.

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$Revision: 1.11 $ $Date: 1998/09/17 16:10:49 $