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

6       c_natgrids  -  primary  double  precision  C entry for natural neighbor
7       gridding
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FUNCTION PROTOTYPE

10       double  *c_natgridd(int, double [], double [], double [],
11                           int, int, double [], double [], int *);
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SYNOPSIS

14       double *c_natgridd (npnts, x, y, z, numxout, numyout, xi, yi, ier);
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DESCRIPTION

17       npnts       The number of input data points. (npnts > 3).
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19       x           An array containing the x coordinates  of  the  input  data
20                   points.
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22       y           An  array  containing  the  y coordinates of the input data
23                   points.
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25       z           An array containing the functional values of the input data
26                   points. That is, z[m] is the value of the input function at
27                   coordinate (x[m],y[m]), for 0 <= m < npnts.
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29       numxout     The number of x values in the output grid.
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31       numyout     The number of y values in the output grid.
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33       xi          An array of dimension numxout containing the x  coordinates
34                   of  the output data grid. The values in xi must be increas‐
35                   ing, but need not be equally spaced.
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37       yi          An array of dimension numyout containing the y  coordinates
38                   of  the output data grid. The values in yi must be increas‐
39                   ing, but need not be equally spaced.
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41       ier         An error value. If *ier is 0, then no errors were detected.
42                   If  *ier  is  non-zero, then refer to the man page for nat‐
43                   grid_errors for details.
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USAGE

46       c_natgridd returns a pointer to a linear array of data that is  is  the
47       interpolated  grid  stored  in  row-major  order.  That  is,  if out is
48       declared as
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50       double *out;
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52       and we set:
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54         out = c_natgridd(numin, x, y, z, numxout, numyout, xo, yo, &ier);
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56       then out[i*numyout+j] is the interpolated function value at  coordinate
57       point  (xo[i],yo[j])  for  0  <=  i < numxout and 0 <= j < numyout. The
58       space for out is allocated internal to c_natgrids and is  numxout*numy‐
59       out double values in size.
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ACCESS

62       To use c_natgridd, load the NCAR Graphics library ngmath.
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SEE ALSO

65       natgrid,  natgrid_params,  c_nnseti,  c_nngeti,  c_nnsetrd,  c_nngetrd,
66       c_nnsetc, c_nngetc.
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68       Complete documentation for Natgrid is available at URL
69       http://ngwww.ucar.edu/ngdoc/ng/ngmath/natgrid/nnhome.html
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72       Copyright (C) 2000
73       University Corporation for Atmospheric Research
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75       The use of this Software is governed by a License Agreement.
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79UNIX                            March 1997-1998             c_natgridd(3NCARG)
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