Provided by: libncarg-dev_6.3.0-6build1_amd64

**NAME**

c_natgrids - primary double precision C entry for natural neighbor gridding

**FUNCTION** **PROTOTYPE**

double *c_natgridd(int, double [], double [], double [], int, int, double [], double [], int *);

**SYNOPSIS**

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

**DESCRIPTION**

npnts The number of input data points. (npnts > 3). x An array containing the x coordinates of the input data points. y An array containing the y coordinates of the input data points. z An array containing the functional values of the input data points. That is, z[m] is the value of the input function at coordinate (x[m],y[m]), for 0 <= m < npnts. numxout The number of x values in the output grid. numyout The number of y values in the output grid. xi An array of dimension numxout containing the x coordinates of the output data grid. The values in xi must be increasing, but need not be equally spaced. yi An array of dimension numyout containing the y coordinates of the output data grid. The values in yi must be increasing, but need not be equally spaced. ier An error value. If *ier is 0, then no errors were detected. If *ier is non- zero, then refer to the man page for natgrid_errors for details.

**USAGE**

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

**ACCESS**

To use c_natgridd, load the NCAR Graphics library ngmath.

**SEE** **ALSO**

natgrid, natgrid_params, c_nnseti, c_nngeti, c_nnsetrd, c_nngetrd, c_nnsetc, c_nngetc. Complete documentation for Natgrid is available at URL http://ngwww.ucar.edu/ngdoc/ng/ngmath/natgrid/nnhome.html

**COPYRIGHT**

Copyright (C) 2000 University Corporation for Atmospheric Research The use of this Software is governed by a License Agreement.