Provided by: libncarg-dev_6.3.0-6build1_amd64

**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.