# ncl_dspnt2d man page

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.