# ncl_c_dspnt2s man page

c_dspnt2s — Interpolate at a single point (or points) in 2D in single precision

## Function Prototype

void c_dspnt2s(int, float [], float [], float [], int, float [], float [], float *, int *);

## Synopsis

void c_dspnt2s (int n, float x[], float y[], float z[], int m, float xo[], float yo[], float zo, int *ier);

## Description

- n
The number of input data points.

- x
An array containing the X coordinates of the input data points.

- y
An array containing the Y coordinates of the input data points.

- z
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 0 <= l < n .

- m
The number of output data points (this may be "1").

- xo
An array of dimension m containing the X coordinates of the output data. The values in xo may be in any order.

- yo
An array of dimension m containing the Y coordinates of the output data. The values in xo may be in any order.

- zo
A pointer to a float. Space for m floats is allocated for zo by dspnt2s. zo[i] is the interpolated value at point (xo[i],yo[i]) for 0 <= i < n .

- ier
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.

## Usage

This function is called when you want to interpolate 2D data at an individual point or points.

## Access

To use c_dspnt2s, 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.