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#include <getopt.h>
#include <stdio.h>
// if you have GLUT installed, you can see graphics!
#ifdef HAVE_GLUT
#include <GL/glut.h>
#endif
// include your group and spin space
#include <z2.h>
#include <ising.h>
// finite_states.h can be included for spin types that have special variables
// defined, and it causes wolff execution to use precomputed bond probabilities
#include <finite_states.h>
// rand.h uses a unix-specific way to seed the random number generator
#include <rand.h>
// measure.h contains useful functions for saving timeseries to files
#include <measure.h>
// include wolff.h
#include <wolff.h>
int main(int argc, char *argv[]) {
count_t N = (count_t)1e4;
D_t D = 2;
L_t L = 128;
double T = 2.26918531421;
double H = 0.0;
bool silent = false;
bool draw = false;
bool N_is_sweeps = false;
unsigned int window_size = 512;
// don't measure anything by default
unsigned char measurement_flags = 0;
int opt;
while ((opt = getopt(argc, argv, "N:D:L:T:H:sdw:M:S")) != -1) {
switch (opt) {
case 'N': // number of steps
N = (count_t)atof(optarg);
break;
case 'D': // dimension
D = atoi(optarg);
break;
case 'L': // linear size
L = atoi(optarg);
break;
case 'T': // temperature
T = atof(optarg);
break;
case 'H': // external field
H = atof(optarg);
break;
case 's': // don't print anything during simulation. speeds up slightly
silent = true;
break;
case 'S':
N_is_sweeps = true;
break;
case 'd':
#ifdef HAVE_GLUT
draw = true;
break;
#else
printf("You didn't compile this with the glut library installed!\n");
exit(EXIT_FAILURE);
#endif
case 'w':
window_size = atoi(optarg);
break;
case 'M':
measurement_flags ^= 1 << atoi(optarg);
break;
default:
exit(EXIT_FAILURE);
}
}
// get nanosecond timestamp for unique run id
unsigned long timestamp;
{
struct timespec spec;
clock_gettime(CLOCK_REALTIME, &spec);
timestamp = spec.tv_sec*1000000000LL + spec.tv_nsec;
}
// initialize random number generator
gsl_rng *r = gsl_rng_alloc(gsl_rng_taus2);
gsl_rng_set(r, rand_seed());
// define spin-spin coupling
std::function <double(const ising_t&, const ising_t&)> Z = [] (const ising_t& s1, const ising_t& s2) -> double {
if (s1.x == s2.x) {
return 1.0;
} else {
return -1.0;
}
};
// define spin-field coupling
std::function <double(const ising_t&)> B = [=] (const ising_t& s) -> double {
if (s.x) {
return -H;
} else {
return H;
}
};
// initialize state object
state_t <z2_t, ising_t> s(D, L, T, Z, B);
// define function that generates self-inverse rotations
std::function <z2_t(gsl_rng *, ising_t)> gen_R = [] (gsl_rng *, const ising_t& s) -> z2_t {
return z2_t(true);
};
FILE **outfiles = measure_setup_files(measurement_flags, timestamp);
std::function <void(const state_t<z2_t, ising_t>&)> other_f;
uint64_t sum_of_clusterSize = 0;
if (N_is_sweeps) {
other_f = [&] (const state_t<z2_t, ising_t>& s) {
sum_of_clusterSize += s.last_cluster_size;
};
} else if (draw) {
#ifdef HAVE_GLUT
// initialize glut
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(window_size, window_size);
glutCreateWindow("wolff");
glClearColor(0.0,0.0,0.0,0.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, L, 0.0, L);
other_f = [] (const state_t <z2_t, ising_t>& s) {
glClear(GL_COLOR_BUFFER_BIT);
for (v_t i = 0; i < pow(s.L, 2); i++) {
if (s.spins[i].x == s.R.x) {
glColor3f(0.0, 0.0, 0.0);
} else {
glColor3f(1.0, 1.0, 1.0);
}
glRecti(i / s.L, i % s.L, (i / s.L) + 1, (i % s.L) + 1);
}
glFlush();
};
#endif
} else {
other_f = [] (const state_t<z2_t, ising_t>& s) {};
}
std::function <void(const state_t<z2_t, ising_t>&)> measurements = measure_function_write_files(measurement_flags, outfiles, other_f);
// add line to metadata file with run info
{
FILE *outfile_info = fopen("wolff_metadata.txt", "a");
fprintf(outfile_info, "<| \"ID\" -> %lu, \"MODEL\" -> \"ISING\", \"q\" -> 2, \"D\" -> %" PRID ", \"L\" -> %" PRIL ", \"NV\" -> %" PRIv ", \"NE\" -> %" PRIv ", \"T\" -> %.15f, \"H\" -> %.15f |>\n", timestamp, s.D, s.L, s.nv, s.ne, T, H);
fclose(outfile_info);
}
// run wolff for N cluster flips
if (N_is_sweeps) {
count_t N_rounds = 0;
printf("\n");
while (sum_of_clusterSize < N * s.nv) {
printf("\033[F\033[J\033[F\033[JWOLFF: sweep %" PRIu64 " / %" PRIu64 ": E = %.2f, S = %" PRIv "\n", (count_t)((double)sum_of_clusterSize / (double)s.nv), N, s.E, s.last_cluster_size);
wolff(N, s, gen_R, measurements, r, silent);
N_rounds++;
}
printf("\033[F\033[J\033[F\033[JWOLFF: sweep %" PRIu64 " / %" PRIu64 ": E = %.2f, S = %" PRIv "\n\n", (count_t)((double)sum_of_clusterSize / (double)s.nv), N, s.E, s.last_cluster_size);
} else {
wolff(N, s, gen_R, measurements, r, silent);
}
// free the random number generator
gsl_rng_free(r);
measure_free_files(measurement_flags, outfiles);
return 0;
}
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