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#include "fracture.h"
double *genfunc_uniform(unsigned int L, bound_t boundary, 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 g(double rho, double dist) {
return 1 - gsl_sf_exp(-M_PI * rho * dist);
}
double *genfunc_hyperuniform(unsigned int L, bound_t boundary, 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;
unsigned int to_gen = *num;
unsigned int start = 0;
if (boundary == EMBEDDED_BOUND) {
for (unsigned int i = 0; i < L / 2; i++) {
lattice[2 * i + 1] = 0;
lattice[2 * i] = (2. * i + 1.) / L;
lattice[L + 2 * i + 1] = 1;
lattice[L + 2 * i] = (2. * i + 1.) / L;
lattice[2 * L + 2 * i + 1] = (2. * i + 1.) / L;
lattice[2 * L + 2 * i] = 0;
lattice[3 * L + 2 * i + 1] = (2. * i + 1.) / L;
lattice[3 * L + 2 * i] = 1;
}
to_gen -= 2 * L;
start = 2 * L;
}
for (unsigned int i = 0; i < to_gen; i++) {
bool reject = true;
double x, y;
while(reject) {
x = gsl_ran_flat(r, 0, 1);
y = gsl_ran_flat(r, 0, 1);
double pp = 1;
for (unsigned int j = 0; j < i; j++) {
double ds0, ds1, ds2, ds3, ds4, ds5, ds6, ds7, ds8;
ds0 = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1],2);
ds1 = pow(x-lattice[2*j] + 1,2)+pow(y-lattice[2*j+1],2);
ds2 = pow(x-lattice[2*j] - 1,2)+pow(y-lattice[2*j+1],2);
ds3 = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1] + 1,2);
ds4 = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1] - 1,2);
ds5 = pow(x-lattice[2*j] + 1,2)+pow(y-lattice[2*j+1] + 1,2);
ds6 = pow(x-lattice[2*j] + 1,2)+pow(y-lattice[2*j+1] - 1,2);
ds7 = pow(x-lattice[2*j] - 1,2)+pow(y-lattice[2*j+1] + 1,2);
ds8 = pow(x-lattice[2*j] - 1,2)+pow(y-lattice[2*j+1] - 1,2);
pp *= g(rho, ds0) * g(rho, ds1) * g(rho, ds2) * g(rho, ds3) * g(rho, ds4) * g(rho, ds5) * g(rho, ds6) * g(rho, ds7) * g(rho, ds8);
}
if (pp > gsl_ran_flat(r, 0, 1)) reject = false;
}
lattice[2*start + 2 * i] = x;
lattice[2*start + 2 * i + 1] = y;
}
return lattice;
}
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