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37 lines
931 B
C
37 lines
931 B
C
#include "genlib.h"
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#include "log.h"
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#include <math.h>
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#include <stdio.h>
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#include <time.h>
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/*cubic covariance function*/
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double cubic(double h) {
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double* used_ram_t0 = malloc(sizeof(double));
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getVirtualMemUsed(used_ram_t0);
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clock_t t = clock();
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log_info("RESULT = in progress, h = %f", h);
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double z;
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if (h >= 1.) {
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z = 0.;
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} else {
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z = 1. - 7. * (double)(h * h) + (35. / 4.) * (double)(h * h * h) - 3.5 * (double)(h * h * h * h * h) + .75 * (double)(h * h * h * h * h * h * h);
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}
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t = clock() - t;
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double time_taken = ((double)t)/CLOCKS_PER_SEC; // calculate the elapsed time
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double* used_ram_tf = malloc(sizeof(double));
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getVirtualMemUsed(used_ram_tf);
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log_info("RESULT = success, z = %f, ELAPSED = %f seconds, DIF USED VIRTUAL MEM = %5.1f MB", z, time_taken, *used_ram_tf - *used_ram_t0);
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free(used_ram_t0);
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free(used_ram_tf);
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return z;
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}
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