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79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
#include <stdlib.h>
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#include <math.h>
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#include "geostat.h"
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/*TURNS NORMAL NUMBERS INTO LOGNORMAL NUMBERS */
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/*input: */
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/*realin: structure defining a realization - */
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/* normal numbers */
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/*typelog: --> 3: lognormal (natural) */
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/* --> 4: lognormal (log10) */
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/*output: */
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/*realout: structure defining a realization - */
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/* lognormal numbers */
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void nor2log(struct realization_mod *realin, int typelog, struct realization_mod *realout)
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{
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int i;
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double coeff;
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coeff = log(10.0);
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/*Is the output realization allocated ?*/
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/*is its length equal to realin.n?*/
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if ((*realout).vector == NULL || (*realout).n != (*realin).n) {
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(*realout).vector = (double *) malloc((*realin).n * sizeof(double));
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if ((*realout).vector == NULL) {
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printf("No memory available");
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return;
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}
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}
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(*realout).n = (*realin).n;
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switch ((*realin).code) {
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case 0:
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case 1:
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case 2:
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(*realout).code = typelog;
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break;
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case 6:
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case 7:
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if (typelog == 3) {
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(*realout).code = 8;
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} else if (typelog == 4) {
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(*realout).code = 9;
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}
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break;
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default:
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printf("Input is not normal in nor2log");
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return;
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break;
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}
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/*anamorphose*/
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for (i = 0; i < (*realin).n; i++) {
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switch (typelog) {
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case 3:
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/*natural logarithm*/
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(*realout).vector[i] = exp((*realin).vector[i]);
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break;
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case 4:
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/*log10*/
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(*realout).vector[i] = exp((*realin).vector[i]*coeff);
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break;
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default:
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printf("Unexpected case in nor2log");
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return;
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break;
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}
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}
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return;
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}
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