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#include "fracture.h"
double *genfunc_uniform(unsigned int L, gsl_rng *r, unsigned int *num) {
*num = pow(L / 2 + 1, 2) + pow((L + 1) / 2, 2);
double *lattice = (double *)malloc(2 * (*num) * sizeof(double));
for (unsigned int i = 0; i < (*num); i++) {
lattice[2*i] = gsl_ran_flat(r, 0, 1);
lattice[2*i+1] = gsl_ran_flat(r, 0, 1);
}
return lattice;
}
double *genfunc_hyperuniform(unsigned int L, gsl_rng *r, unsigned int *num) {
*num = pow(L / 2 + 1, 2) + pow((L + 1) / 2, 2);
// necessary to prevent crashing when underflow occurs
gsl_set_error_handler_off();
double *lattice = (double *)malloc(2 * (*num) * sizeof(double));
double rho = *num;
for (unsigned int i = 0; i < (*num); i++) {
bool reject = true;
double x, y;
while(reject) {
x = gsl_ran_flat(r, 0, 1);
y = gsl_ran_flat(r, 0, 1);
reject = false;
for (unsigned int j = 0; j < i; j++) {
double *ds = (double *)malloc(5 * sizeof(double));
ds[0] = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1],2);
ds[1] = pow(x-lattice[2*j] + 1,2)+pow(y-lattice[2*j+1],2);
ds[2] = pow(x-lattice[2*j] - 1,2)+pow(y-lattice[2*j+1],2);
ds[3] = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1] + 1,2);
ds[4] = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1] - 1,2);
unsigned int min_pos = 0; double min_val = 100;
for (unsigned int k = 0; k < 5; k++) {
if (min_val > ds[k]) {
min_pos = k; min_val = ds[k];
}
}
if (1-gsl_sf_exp(-M_PI * rho * min_val) < gsl_ran_flat(r, 0, 1)) {
reject = true;
break;
}
}
}
lattice[2 * i] = x;
lattice[2 * i + 1] = y;
}
return lattice;
}
void randfunc_flat(gsl_rng *r, double *x, double *y) {
*x = gsl_ran_flat(r, 0, 1);
*y = gsl_ran_flat(r, 0, 1);
}
void randfunc_gaus(gsl_rng *r, double *x, double *y) {
*x = 100;
*y = 100;
double sigma = 0.25;
while (fabs(*x) > 0.5 || fabs(*y) > 0.5) {
gsl_ran_bivariate_gaussian(r, sigma, sigma, 0, x, y);
}
*x += 0.5;
*y += 0.5;
}
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