From 2d8fcebf2f56efd1c3913ba49eaff6520ffdb33d Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Fri, 6 Jul 2018 14:42:44 -0400
Subject: rewrote wolff in c++ with templates so that any system can be run
 with it

---
 src/wolff.cpp | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 src/wolff.cpp

(limited to 'src/wolff.cpp')

diff --git a/src/wolff.cpp b/src/wolff.cpp
new file mode 100644
index 0000000..85df357
--- /dev/null
+++ b/src/wolff.cpp
@@ -0,0 +1,137 @@
+
+#include <time.h>
+#include <getopt.h>
+
+#include <cluster.h>
+
+double H_vector(vector_t <2, double> v1, double *H) {
+  vector_t <2, double> H_vec;
+  H_vec.x = H;
+  return dot <2, double> (v1, H_vec);
+}
+
+int main(int argc, char *argv[]) {
+
+  count_t N = (count_t)1e7;
+
+  D_t D = 2;
+  L_t L = 128;
+  double T = 2.26918531421;
+  double *H = (double *)calloc(MAX_Q, sizeof(double));
+
+  bool silent = false;
+
+  int opt;
+  q_t J_ind = 0;
+  q_t H_ind = 0;
+
+  while ((opt = getopt(argc, argv, "N:q:D:L:T:J:H: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. nth call couples to state n
+      H[H_ind] = atof(optarg);
+      H_ind++;
+      break;
+    case 's': // don't print anything during simulation. speeds up slightly
+      silent = true;
+      break;
+    default:
+      exit(EXIT_FAILURE);
+    }
+  }
+
+  state_t <orthogonal_t <2, double>, vector_t <2, double>> s(D, L, T, dot <2, double>, std::bind(H_vector, std::placeholders::_1, H));
+
+  // initialize random number generator
+  gsl_rng *r = gsl_rng_alloc(gsl_rng_mt19937);
+  gsl_rng_set(r, rand_seed());
+
+  unsigned long timestamp;
+
+  {
+    struct timespec spec;
+    clock_gettime(CLOCK_REALTIME, &spec);
+    timestamp = spec.tv_sec*1000000000LL + spec.tv_nsec;
+  }
+
+  FILE *outfile_info = fopen("wolff_metadata.txt", "a");
+
+  fprintf(outfile_info, "<| \"ID\" -> %lu, \"D\" -> %" PRID ", \"L\" -> %" PRIL ", \"NV\" -> %" PRIv ", \"NE\" -> %" PRIv ", \"T\" -> %.15f, \"H\" -> {", timestamp, D, L, s.nv, s.ne, T);
+
+  for (q_t i = 0; i < 2; i++) {
+    fprintf(outfile_info, "%.15f", H[i]);
+    if (i < 2 - 1) {
+      fprintf(outfile_info, ", ");
+    }
+  }
+
+  fprintf(outfile_info, "} |>\n");
+
+  fclose(outfile_info);
+
+  char *filename_M = (char *)malloc(255 * sizeof(char));
+  char *filename_E = (char *)malloc(255 * sizeof(char));
+  char *filename_S = (char *)malloc(255 * sizeof(char));
+
+  sprintf(filename_M, "wolff_%lu_M.dat", timestamp);
+  sprintf(filename_E, "wolff_%lu_E.dat", timestamp);
+  sprintf(filename_S, "wolff_%lu_S.dat", timestamp);
+
+  FILE *outfile_M = fopen(filename_M, "wb");
+  FILE *outfile_E = fopen(filename_E, "wb");
+  FILE *outfile_S = fopen(filename_S, "wb");
+
+  free(filename_M);
+  free(filename_E);
+  free(filename_S);
+
+  v_t cluster_size = 0;
+
+  if (!silent) printf("\n");
+  for (count_t steps = 0; steps < N; steps++) {
+    if (!silent) printf("\033[F\033[JWOLFF: sweep %" PRIu64 " / %" PRIu64 ": E = %.2f, M_0 = %.2f, S = %" PRIv "\n", steps, N, s.E, s.M.x[0], cluster_size);
+
+    v_t v0 = gsl_rng_uniform_int(r, s.nv);
+     
+    orthogonal_t <2, double> step;
+    generate_rotation<2>(r, &step);
+
+    printf("(%g %g) . (%g %g) = %g or %g, H = %g\n\n", s.spins[0].x[0], s.spins[0].x[1], s.spins[1].x[0], s.spins[1].x[1], dot(s.spins[0], s.spins[1]), s.J(s.spins[0],s.spins[1]), s.H(s.spins[0]));
+
+    getchar();
+    cluster_size = flip_cluster <orthogonal_t <2, double>, vector_t <2, double>> (&s, v0, step, r);
+
+    free_spin(step);
+
+    fwrite(&(s.E), sizeof(double), 1, outfile_E);
+    fwrite(s.M.x, sizeof(double), 2, outfile_M);
+    fwrite(&cluster_size, sizeof(uint32_t), 1, outfile_S);
+
+  }
+  if (!silent) {
+    printf("\033[F\033[J");
+  }
+  printf("WOLFF: sweep %" PRIu64 " / %" PRIu64 ": E = %.2f, M_0 = %.2f, S = %" PRIv "\n", N, N, s.E, s.M.x[0], cluster_size);
+
+  fclose(outfile_M);
+  fclose(outfile_E);
+  fclose(outfile_S);
+
+  gsl_rng_free(r);
+
+  free(H);
+
+  return 0;
+}
+
-- 
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