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