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

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

9       float *c_natgrids(int, float [], float [], float [],
10                         int, int, float [], float [], int *);
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SYNOPSIS

13       float *c_natgrids (npnts, x, y, z, numxout, numyout, xi, yi, ier);
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DESCRIPTION

16       npnts       The number of input data points. (npnts > 3).
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18       x           An  array  containing  the  x coordinates of the input data
19                   points.
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21       y           An array containing the y coordinates  of  the  input  data
22                   points.
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24       z           An array containing the functional values of the input data
25                   points. That is, z[m] is the value of the input function at
26                   coordinate (x[m],y[m]), for 0 <= m < npnts.
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28       numxout     The number of x values in the output grid.
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30       numyout     The number of y values in the output grid.
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32       xi          An  array of dimension numxout containing the x coordinates
33                   of the output data grid. The values in xi must be  increas‐
34                   ing, but need not be equally spaced.
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36       yi          An  array of dimension numyout containing the y coordinates
37                   of the output data grid. The values in yi must be  increas‐
38                   ing, but need not be equally spaced.
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40       ier         An  error  value.  If *ier is returned as 0, then no errors
41                   were detected. If *ier is non-zero, then refer to  the  man
42                   page for natgrid_errors for details.
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USAGE

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

61       To use c_natgrids, load the NCAR Graphics library ngmath.
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SEE ALSO

64       natgrid,  natgrid_params,  c_nnseti,  c_nngeti,   c_nnsetr,   c_nngetr,
65       c_nnsetc, c_nngetc.
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67       Complete documentation for Natgrid is available at URL
68       http://ngwww.ucar.edu/ngdoc/ng/ngmath/natgrid/nnhome.html
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71       Copyright (C) 2000
72       University Corporation for Atmospheric Research
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74       The use of this Software is governed by a License Agreement.
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78UNIX                            March 1997-1998             c_natgrids(3NCARG)
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