c_nnpntinitd - Enter single point mode

       To use c_nnpntinitd, 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                                             March 1997-1998                            c_nnpntinitd(3NCARG)

       npnts       The number of input data points. (npnts > 3)

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

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

       z           An  array  of  size npnts containing the functional values of the input data points. That is,
                   z[n] is the value of the input function at coordinate (x[n],y[n]), for 0 <= n < npnts.

       void c_nnpntinitd(int, double [], double [], double []);

       c_nnpntinitd - Enter single point mode

       natgrid, natgrid_params, c_natgridd, c_nnpntd, c_nnpntendd.

       Complete documentation for Natgrid is available at URL
       http://ngwww.ucar.edu/ngdoc/ng/ngmath/natgrid/nnhome.html

       void c_nnpntinitd (npnts, x, y, z);

       This function is invoked when you want to interpolate at  individal  points.   It  is  an  initialization
       routine  that  sets  up  some  internal variables and does this initial triangulation. To actually do the
       interplation, use function c_nnpntd.  To terminate single point mode, use the function c_nnpntendd.