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46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#include <stdio.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <math.h>
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#include "geostat.h"
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/* build_real */
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/* build a realization in the spectral domain */
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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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/*covar: vector defining the covariance in spectral domain */
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/*realization: vector defining the real part */
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/*ireal: vector defining the i-part */
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void build_real(int n[3],int NTOT,double *covar,double *realization,double *ireal)
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{
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int i,j,k,maille1;
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double temp;
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/*decomposition and multiplication in the spectral domain*/
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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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temp = covar[maille1];
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if (temp > 0.) {
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temp = sqrt(temp)/(double) NTOT;
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} else if (temp < 0.) {
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temp = sqrt(-temp)/(double) NTOT;
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}
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realization[maille1] *= temp;
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ireal[maille1] *= temp;
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}
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}
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}
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return;
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}
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