NATGRIDD(3NCARG)

NAME
NATGRIDD - primary double precision Fortran entry for natural neighbor gridding

SYNOPSIS
CALL NATGRIDD (NPNTS, X, Y, Z, NUMXOUT, NUMYOUT, XI, YI, ZI, IER)

DESCRIPTION

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

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

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

Z   (Double precision, Input) - 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 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.

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

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

ZI  (Double precision, Output) - A two-dimensional array of dimension NUMXOUT x NUMYOUT containing the interpolated functional values. ZI(I,J) is the interpolated value at grid point (XI(I),YI(J)).

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 natgrid_errors for details.

USAGE
NATGRIDD is the double precision gridding function in the Natgrid package. The behavior of NATGRIDD is controlled by values set for the various parameters described in natgrid_params. Values for these parameters can be set using the subroutines NNSETI, NNSETRD, and NNSETC.

ACCESS
To use NATGRIDD, load the NCAR Graphics library ngmath.

SEE ALSO
natgrid, natgrid_params, nnseti, nngeti, nnsetrd, nngetrd, nnsetc, nngetc.

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.