idsfft

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

Synopsis

	function idsfft( 
		x[*]:float,
		y[*]:float,
		z[*]:float,
		dimensions[2]:integer
	)

Arguments

x
Array of 4 or more x coordinates.
y
Array of 4 or more y coordinates dimensioned the same as x.
z
Array of 4 or more z coordinates dimensioned the same as y.
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. x and y are randomly spaced coordinates in the X-Y plane, and y contains the values at each X-Y coordinate pair. No two values of x can be equal to each other. If this condition occurs, idsfft prints an error message. NOTE: Early versions of the idsfft function exit when an error is detected; this will be modified by the 4.0 release.

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 x and y, and dividing the range by the size of the requested dimension. The x values define the coordinate range of the second dimension (dimension #1) of the output array, and the y values determine the coordinate range of the first dimension (dimension #0). The output array returned contains the derived coordinate arrays as coordinate variables (See coordinate variables description). Dimension 0 of the output is named "y" and dimension 1 of the output is named "x". For more information, see the NCAR Graphics Version 3.2 man page for IDSFFT.

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$Revision: 1.6 $ $Date: 1995/07/26 23:33:11 $