DSGRID3S - single precision Fortran entry for 3D gridding

       To use DSGRID3S, 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                              DSGRID3S(3NCARG)

       NPNTS       (Integer, Input) - The number of input data points.

       X           (Real, Input) - An array containing the X coordinates of the input data points.

       Y           (Real, Input) - An array containing the Y coordinates of the input data points.

       Z           (Real, Input) - An array containing the Z coordinates of the input data points.

       U           (Real, Input) - An array containing the functional values of the input data points.  That is,
                   U(L) is the value of the input function at coordinate (X(L),Y(L),Z(L)), for L=1,NPNTS.

       NUMXOUT     (Integer, Input) - The number of X values in the output grid.

       NUMYOUT     (Integer, Input) - The number of Y values in the output grid.

       NUMZOUT     (Integer, Input) - The number of Z values in the output grid.

       XO          (Real, Input) - An array of dimension NUMXOUT containing the X coordinates of the output data
                   grid. The values in XO must be increasing, but need not be equally spaced.

       YO          (Real, Input) - An array of dimension NUMYOUT containing the Y coordinates of the output data
                   grid. The values in YO must be increasing, but need not be equally spaced.

       ZO          (Real, Input) - An array of dimension NUMZOUT containing the Z coordinates of the output data
                   grid. The values in ZO must be increasing, but need not be equally spaced.

       UO          (Real,  Output)  -  A  three-dimensional  array  dimensioned  as  UO(NUMXOUT,NUMYOUT,NUMZOUT)
                   containing the interpolated functional values. UO(I,J,K) is the interpolated  value  at  grid
                   point (XO(I),YO(J),ZO(K)).

       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.

       DSGRID3S - single precision Fortran entry for 3D gridding

       dsgrid, dsgrid_params, dsseti, dsgeti, dssetr, dsgetr, dssetc, dsgetc.

       Complete documentation for Dsgrid is available at URL

       http://ngwww.ucar.edu/ngdoc/ng/ngmath/dsgrid/dshome.html

       CALL DSGRID3S (NPNTS, X, Y, Z, U, NUMXOUT, NUMYOUT, NUMZOUT, XO, YO, ZO, UO, IER)

       DSGRID3S is the single precision gridding function in the Dsgrid package.  The behavior  of  DSGRID3S  is
       controlled  by  values  set  for  the  various  parameters  described in dsgrid_params.  Values for these
       parameters can be set using the subroutines DSSETI, DSSETR, and DSSETC.