diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/wolff_clock.cpp | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/wolff_clock.cpp b/src/wolff_clock.cpp new file mode 100644 index 0000000..e186c44 --- /dev/null +++ b/src/wolff_clock.cpp @@ -0,0 +1,154 @@ + +#include <getopt.h> + +#ifdef HAVE_GLUT +#include <GL/glut.h> +#endif + +// include your group and spin space +#include <dihedral.h> +#include <potts.h> +#include <colors.h> + +// hack to speed things up considerably +#define N_STATES POTTSQ +#include <finite_states.h> + +// include wolff.h +#include <rand.h> +#include <wolff.h> + +typedef state_t <dihedral_t<q_t,POTTSQ>, potts_t<POTTSQ>> sim_t; + +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_vec = (double *)calloc(MAX_Q, sizeof(double)); + + bool silent = false; + bool draw = false; + unsigned int window_size = 512; + + int opt; + q_t H_ind = 0; + + while ((opt = getopt(argc, argv, "N:D:L:T:H:sdw:")) != -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. nth call couples to state n + H_vec[H_ind] = atof(optarg); + H_ind++; + break; + case 's': // don't print anything during simulation. speeds up slightly + silent = 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; + default: + exit(EXIT_FAILURE); + } + } + + // initialize random number generator + gsl_rng *r = gsl_rng_alloc(gsl_rng_mt19937); + gsl_rng_set(r, rand_seed()); + + // define spin-spin coupling + std::function <double(potts_t<POTTSQ>, potts_t<POTTSQ>)> Z = [] (potts_t<POTTSQ> s1, potts_t<POTTSQ> s2) -> double { + return cos(2 * M_PI * (double)(s1.x + POTTSQ - s2.x) / (double)POTTSQ); + }; + + // define spin-field coupling + std::function <double(potts_t<POTTSQ>)> B = [=] (potts_t<POTTSQ> s) -> double { + return H_vec[s.x]; + }; + + // initialize state object + state_t <dihedral_t<q_t,POTTSQ>, potts_t<POTTSQ>> s(D, L, T, Z, B); + + // define function that generates self-inverse rotations + std::function <dihedral_t<q_t,POTTSQ>(gsl_rng *, potts_t<POTTSQ>)> gen_R = [] (gsl_rng *r, potts_t<POTTSQ> v) -> dihedral_t<q_t,POTTSQ> { + dihedral_t<q_t,POTTSQ> rot; + rot.is_reflection = true; + q_t x = gsl_rng_uniform_int(r, POTTSQ - 1); + rot.x = (2 * v.x + x + 1) % POTTSQ; + + return rot; + }; + + // define function that updates any number of measurements + std::function <void(const sim_t *)> measurement; + + double average_M = 0; + if (!draw) { + // a very simple example: measure the average magnetization + measurement = [&] (const sim_t *s) { + average_M += (double)s->M[0] / (double)N / (double)s->nv; + }; + } else { + // a more complex example: measure the average magnetization, and draw the spin configuration to the screen + +#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); + + measurement = [&] (const sim_t *s) { + average_M += (double)s->M[0] / (double)N / (double)s->nv; + glClear(GL_COLOR_BUFFER_BIT); + for (v_t i = 0; i < pow(L, 2); i++) { + potts_t<POTTSQ> tmp_s = act_inverse(s->R, s->spins[i]); + glColor3f(hue_to_R(tmp_s.x * 2 * M_PI / POTTSQ), hue_to_G(tmp_s.x * 2 * M_PI / POTTSQ), hue_to_B(tmp_s.x * 2 * M_PI / POTTSQ)); + glRecti(i / L, i % L, (i / L) + 1, (i % L) + 1); + } + glFlush(); + }; +#endif + } + + // run wolff for N cluster flips + wolff(N, &s, gen_R, measurement, r, silent); + + // tell us what we found! + printf("%" PRIcount " %d-Potts runs completed. D = %" PRID ", L = %" PRIL ", T = %g, H = %g, <M> = %g\n", N, POTTSQ, D, L, T, H_vec[0], average_M); + + // free the random number generator + gsl_rng_free(r); + + if (draw) { + } + + return 0; + +} + |