NAME

       NNPNTINITD - Enter single point mode in double precision

SYNOPSIS

       CALL NNPNTINITD (NPNTS, X, Y, Z)

DESCRIPTION

       NPNTS       (Integer, Input) - The number of input data points. (NPNTS > 3).

       X           (Double  precison,  Input)  -  An  array  of  dimension NPNTS containing the X
                   coordinates of the input data points.

       Y           (Double precison, Input) - An  array  of  dimension  NPNTS  containing  the  Y
                   coordinates of the input data points.

       Z           (Double  precison,  Input)  -  An  array  of  dimension  NPNTS  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 L=1,NPNTS.

USAGE

       This  subroutine  is  called  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 subroutine NNPNTD.  To terminate
       single point mode, use the subroutine NNPNTENDD.

ACCESS

       To use NNPNTINITD, load the NCAR Graphics library ngmath.

SEE ALSO

       natgrid, natgrid_params, natgridd, nnpntd, 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.