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58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
#include "geostat.h"
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#include "chunk_array.h"
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#include <math.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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/* prebuild_gwn */
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/* Produce a first construction in real space of the Gaussian white noise */
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/* grid: structure defining the grid */
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/*n: vector with the number of cells along the */
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/* X, Y and Z axes for the underlying grid */
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/* i = [0 1 2] */
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/* --> 0 0 0 : n will be computed and */
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/* updated as output */
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/* --> nx ny nz: these dimensions are used */
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/*realin: structure defining a realization - */
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/* must be a Gaussian white noise */
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/*realization: structure defining a realization*/
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void prebuild_gwn(struct grid_mod grid, int n[3], struct realization_mod* realin, chunk_array_t* realization, int solver, int cores, long* seed) {
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int i, j, k, maille0, maille1;
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int ntot;
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long idum2 = 123456789, iy = 0;
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long* iv = (long*)malloc(NTAB * sizeof(long));
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/*negative seed*/
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if (*seed > 0.0)
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*seed = -(*seed);
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ntot = n[0] * n[1] * n[2];
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chunk_array_save(realization, 0, 0.);
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if (solver == 1) {
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for (i = 0; i < ntot; i++) {
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double value = gasdev(seed, &idum2, &iy, iv, cores);
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chunk_array_save(realization, i+1, value);
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}
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} else {
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for (k = 1; k <= n[2]; k++) {
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for (j = 1; j <= n[1]; j++) {
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for (i = 1; i <= n[0]; i++) {
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maille1 = i + (j - 1 + (k - 1) * n[1]) * n[0];
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if (i <= grid.NX && j <= grid.NY && k <= grid.NZ) {
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double value = gasdev(seed, &idum2, &iy, iv, cores);
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chunk_array_save(realization, maille1, value);
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} else {
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chunk_array_save(realization, maille1, 0.);
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}
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}
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}
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}
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}
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}
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