natgridd (3NCARG)

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

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.

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.

To use NATGRIDD, load the NCAR Graphics library ngmath.

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 (C) 2000

University Corporation for Atmospheric Research

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