#include "genlib.h"
#include "log.h"
#include <math.h>
#include <stdio.h>

/*cardsin covariance function*/
double cardsin(double h) {
    log_info("RESULT = in progress, h = %f", h);

    float delta = 20.371;
    double z;

    if (h != 0) {
        z = (double)(h * delta);
        z = sin(z) / z;
    } else {
        z = 1.;
    }

    log_info("RESULT = success, z = %f", z);

    return z;
}