1DSGRID2D(3NCARG)                 NCAR GRAPHICS                DSGRID2D(3NCARG)
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NAME

6       DSGRID2D - double precision Fortran entry for iterpolation from 2D ran‐
7       dom data to an output grid.
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SYNOPSIS

10       CALL DSGRID2D (NPNTS, X, Y, Z, NUMXOUT, NUMYOUT, XO, YO, ZO, IER)
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DESCRIPTION

13       NPNTS       (Integer, Input) - The number of input data points.
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15       X           (Double precision, Input) - An array containing the X coor‐
16                   dinates of the input data points.
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18       Y           (Double precision, Input) - An array containing the Y coor‐
19                   dinates of the input data points.
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21       Z           (Double precision, Input) - An array containing  the  func‐
22                   tional  values  of  the input data points. That is, Z(L) is
23                   the value of the input function at coordinate  (X(L),Y(L)),
24                   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       XO          (Double  precision,  Input) - An array of dimension NUMXOUT
33                   containing the X coordinates of the output data  grid.  The
34                   values  in  XO  must be increasing, but need not be equally
35                   spaced.
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37       YO          (Double precision, Input) - An array of  dimension  NUMYOUT
38                   containing  the  Y coordinates of the output data grid. The
39                   values in YO must be increasing, but need  not  be  equally
40                   spaced.
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42       ZO          (Double  precision,  Output)  -  A two-dimensional array of
43                   dimension NUMXOUT x  NUMYOUT  containing  the  interpolated
44                   functional  values.  ZO(I,J)  is  the interpolated value at
45                   grid point (XO(I),YO(J)).
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47       IER         (Integer, Output) -  An  error  return  value.  If  IER  is
48                   returned as 0, then no errors were detected. If IER is non-
49                   zero, then refer to the  man  page  for  dsgrid_errors  for
50                   details.
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USAGE

53       DSGRID2D  is  the double precision gridding function for 2D data in the
54       Dsgrid package.  The behavior of DSGRID2D is controlled by  values  set
55       for  the  various  parameters  described  in dsgrid_params.  Values for
56       these parameters can be set using the subroutines DSSETI, DSSETRD,  and
57       DSSETC.
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59       In  almost  all  cases  the  ngmath  function  NATGRIDD  is superior to
60       DSGRID2D for 2D interpolation.  See  the  man  page  for  NATGRIDD  for
61       details.
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ACCESS

64       To use DSGRID2D, load the NCAR Graphics library ngmath.
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SEE ALSO

67       dsgrid,   dsgrid_params,  dsseti,  dsgeti,  dssetrd,  dsgetrd,  dssetc,
68       dsgetc.
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70       Complete documentation for Dsgrid is available at URL
71       http://ngwww.ucar.edu/ngdoc/ng/ngmath/dsgrid/dshome.html
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74       Copyright (C) 2000
75       University Corporation for Atmospheric Research
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77       The use of this Software is governed by a License Agreement.
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81UNIX                          September 1997-1998             DSGRID2D(3NCARG)
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