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

/*TURNS NORMAL NUMBERS INTO LOGNORMAL NUMBERS   */
/*input:                                        */
/*realin: structure defining a realization -    */
/*        normal numbers                        */
/*typelog: --> 3: lognormal (natural)           */
/*         --> 4: lognormal (log10)             */
/*output:                                       */
/*realout: structure defining a realization -   */
/*         lognormal numbers                    */

void nor2log(struct realization_mod* realin, int typelog, struct realization_mod* realout) {
    int i;
    double coeff;

    coeff = log(10.0);

    /*Is the output realization allocated ?*/
    /*is its length equal to realin.n?*/
    if ((*realout).vector == NULL || (*realout).n != (*realin).n) {
        (*realout).vector = (double*)malloc((*realin).n * sizeof(double));
        if ((*realout).vector == NULL) {
            printf("No memory available");
            return;
        }
    }
    (*realout).n = (*realin).n;

    switch ((*realin).code) {
    case 0:
    case 1:
    case 2:
        (*realout).code = typelog;
        break;
    case 6:
    case 7:
        if (typelog == 3) {
            (*realout).code = 8;
        } else if (typelog == 4) {
            (*realout).code = 9;
        }
        break;
    default:
        printf("Input is not normal in nor2log");
        return;
        break;
    }

    /*anamorphose*/
    for (i = 0; i < (*realin).n; i++) {
        switch (typelog) {
        case 3:
            /*natural logarithm*/
            (*realout).vector[i] = exp((*realin).vector[i]);
            break;
        case 4:
            /*log10*/
            (*realout).vector[i] = exp((*realin).vector[i] * coeff);
            break;
        default:
            return;
            break;
        }
    }
}