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

       To use c_dspnt2s, load the NCAR Graphics library ngmath.

       Copyright (C) 2000
       University Corporation for Atmospheric Research

       The use of this Software is governed by a License Agreement.

UNIX                                           September 1997-1998                             c_dspnt2s(3NCARG)

       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.

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

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

       dsgrid, dsgrid_params.

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

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

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