NAME

       c_nnpntinitd - Enter single point mode

FUNCTION PROTOTYPE

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

SYNOPSIS

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

DESCRIPTION

       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.

USAGE

       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.

ACCESS

       To use c_nnpntinitd, load the NCAR Graphics library ngmath.

SEE ALSO

       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

COPYRIGHT

       Copyright (C) 2000
       University Corporation for Atmospheric Research

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