simulacion-permeabilidad/fftma_module/gen/lib_src/cgrid.c

#include "geostat.h"
#include <stdlib.h>
#include <time.h>

/*computes the size of the grid for FFTs*/
/*input:                                           */
/*variogram: structure defining the variogram model*/
/*grid: structure defining the actual grid         */
/*output:                                          */
/*n: vector with the number of cells along the     */
/*   X, Y and Z axes for the underlying grid       */
/*   i = [0 1 2]                                   */
void cgrid(struct vario_mod variogram, struct grid_mod grid, int n[3]) {
    int i, N;
    double D;
    
    if (n == NULL || n[0] == 0 || n[1] == 0 || n[2] == 0) {
        for (i = 0; i < 3; i++) {
            switch (i) {
            case 0:
                N = grid.NX;
                D = grid.DX;
                break;
            case 1:
                N = grid.NY;
                D = grid.DY;
                break;
            case 2:
                N = grid.NZ;
                D = grid.DZ;
                break;
            }
            n[i] = length(N, i, variogram.scf, variogram.ap, D, variogram.Nvario);
        }
    } else {
        if ((n[0] < grid.NX) || (n[1] < grid.NY) || (n[2] < grid.NZ)) {
            exit;
        }
    }
}