1NATGRIDS(3NCARG)                 NCAR GRAPHICS                NATGRIDS(3NCARG)
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NAME

6       NATGRIDS  - primary single precision Fortran entry for natural neighbor
7       gridding
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SYNOPSIS

10       CALL NATGRIDS (NPNTS, X, Y, Z, NUMXOUT, NUMYOUT, XI, YI, ZI, IER)
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DESCRIPTION

13       NPNTS       (Integer, Input) - The number of input data points.  (NPNTS
14                   > 3).
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16       X           (Real,  Input)  -  An array containing the X coordinates of
17                   the input data points.
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19       Y           (Real, Input) - An array containing the  Y  coordinates  of
20                   the input data points.
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22       Z           (Real,  Input)  - An array containing the functional values
23                   of the input data points. That is, Z(L) is the value of the
24                   input function at coordinate (X(L),Y(L)), for L=1,NPNTS.
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26       NUMXOUT     (Integer,  Input)  -  The  number of X values in the output
27                   grid.
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29       NUMYOUT     (Integer, Input) - The number of Y  values  in  the  output
30                   grid.
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32       XI          (Real,  Input)  -  An array of dimension NUMXOUT containing
33                   the X coordinates of the output data grid. The values in XI
34                   must be increasing, but need not be equally spaced.
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36       YI          (Real,  Input)  -  An array of dimension NUMYOUT containing
37                   the Y coordinates of the output data grid. The values in YI
38                   must be increasing, but need not be equally spaced.
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40       ZI          (Real,  Output)  -   A  two-dimensional  array of dimension
41                   NUMXOUT x NUMYOUT containing  the  interpolated  functional
42                   values.  ZI(I,J)  is  the  interpolated value at grid point
43                   (XI(I),YI(J)).
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45       IER         (Integer, Output) -  An  error  return  value.  If  IER  is
46                   returned as 0, then no errors were detected. If IER is non-
47                   zero, then refer to the man  page  for  natgrid_errors  for
48                   details.
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USAGE

51       NATGRIDS is the single precision gridding function in the Natgrid pack‐
52       age.  The behavior of NATGRIDS is controlled by values set for the var‐
53       ious  parameters described in natgrid_params.  Values for these parame‐
54       ters can be set using the subroutines NNSETI, NNSETR, and NNSETC.
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ACCESS

57       To use NATGRIDS, load the NCAR Graphics library ngmath.
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SEE ALSO

60       natgrid,  natgrid_params,  nnseti,  nngeti,  nnsetr,  nngetr,   nnsetc,
61       nngetc.
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63       Complete documentation for Natgrid is available at URL
64       http://ngwww.ucar.edu/ngdoc/ng/ngmath/natgrid/nnhome.html
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67       Copyright (C) 2000
68       University Corporation for Atmospheric Research
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70       This  documentation  is  free  software; you can redistribute it and/or
71       modify it under the terms of the GNU General  Public  License  as  pub‐
72       lished  by  the  Free  Software  Foundation;  either  version  2 of the
73       License, or (at your option) any later version.
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75       This software is distributed in the hope that it will  be  useful,  but
76       WITHOUT  ANY  WARRANTY;  without  even  the  implied  warranty  of MER‐
77       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  General
78       Public License for more details.
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80       You should have received a copy of the GNU General Public License along
81       with this software; if not, write  to  the  Free  Software  Foundation,
82       Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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87UNIX                            March 1997-1998               NATGRIDS(3NCARG)
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