Provided by: libncarg-dev_6.3.0-6build1_amd64

**NAME**

DSPNT2D - Interpolate at a single point (or points) in 2D in double precision

**SYNOPSIS**

CALL DSPNT2D (N, X, Y, Z, M, XO, YO, ZO, IER)

**DESCRIPTION**

N (Integer, Input) - The number of input data points. X (Double precision, Input) - An array containing the X coordinates of the input data points. Y (Double precision, Input) - An array containing the Y coordinates of the input data points. Z (Double precision, Input) - An array containing the functional values of the input data points. That is, Z(L) is the value of the input function at coordinate (X(L),Y(L)), for L=1,N. M (Integer, Input) - The number of output data points (this may be "1"). XO (Double precision, Input) - An array of dimension M containing the X coordinates of the output data. The values in XO may be in any order. YO (Double precision, Input) - An array of dimension M containing the Y coordinates of the output data. The values in YO may be in any order. ZO (Double precision, Output) - An array of dimension M containing the interpolated values. ZO(I) is the interpolated value at point (XO(I),YO(I)) for I=1,M. IER (Integer, Output) - An error return value. If IER is returned as 0, then no errors were detected. If IER is non-zero, then refer to the man page for dsgrid_errors for details.

**USAGE**

This subroutine is called when you want to interpolate at an individual point or points.

**ACCESS**

To use DSPNT2D, load the NCAR Graphics library ngmath.

**SEE** **ALSO**

dsgrid, dsgrid_params. Complete documentation for Dsgrid is available at URL http://ngwww.ucar.edu/ngdoc/ng/ngmath/dsgrid/dshome.html

**COPYRIGHT**

Copyright (C) 2000 University Corporation for Atmospheric Research The use of this Software is governed by a License Agreement.