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

6       NATGRIDD  - primary double precision Fortran entry for natural neighbor
7       gridding
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SYNOPSIS

10       CALL NATGRIDD (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           (Double precision, Input) - An array containing the X coor‐
17                   dinates of the input data points.
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19       Y           (Double precision, Input) - An array containing the Y coor‐
20                   dinates of the input data points.
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22       Z           (Double  precision,  Input) - An array containing the func‐
23                   tional values of the input data points. That  is,  Z(L)  is
24                   the  value of the input function at coordinate (X(L),Y(L)),
25                   for L=1,NPNTS.
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27       NUMXOUT     (Integer, Input) - The number of X  values  in  the  output
28                   grid.
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30       NUMYOUT     (Integer,  Input)  -  The  number of Y values in the output
31                   grid.
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33       XI          (Double precision, Input) - An array of  dimension  NUMXOUT
34                   containing  the  X coordinates of the output data grid. The
35                   values in XI must be increasing, but need  not  be  equally
36                   spaced.
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38       YI          (Double  precision,  Input) - An array of dimension NUMYOUT
39                   containing the Y coordinates of the output data  grid.  The
40                   values  in  YI  must be increasing, but need not be equally
41                   spaced.
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43       ZI          (Double precision, Output) -  A  two-dimensional  array  of
44                   dimension  NUMXOUT  x  NUMYOUT  containing the interpolated
45                   functional values. ZI(I,J) is  the  interpolated  value  at
46                   grid point (XI(I),YI(J)).
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48       IER         (Integer,  Output)  -  An  error  return  value.  If IER is
49                   returned as 0, then no errors were detected. If IER is non-
50                   zero,  then  refer  to  the man page for natgrid_errors for
51                   details.
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USAGE

54       NATGRIDD is the double precision gridding function in the Natgrid pack‐
55       age.  The behavior of NATGRIDD is controlled by values set for the var‐
56       ious parameters described in natgrid_params.  Values for these  parame‐
57       ters can be set using the subroutines NNSETI, NNSETRD, and NNSETC.
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ACCESS

60       To use NATGRIDD, load the NCAR Graphics library ngmath.
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SEE ALSO

63       natgrid,  natgrid_params,  nnseti,  nngeti,  nnsetrd,  nngetrd, nnsetc,
64       nngetc.
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66       Complete documentation for Natgrid is available at URL
67       http://ngwww.ucar.edu/ngdoc/ng/ngmath/natgrid/nnhome.html
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70       Copyright (C) 2000
71       University Corporation for Atmospheric Research
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73       The use of this Software is governed by a License Agreement.
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77UNIX                            March 1997-1998               NATGRIDD(3NCARG)
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