new mesaurement flag system, fftw only initialized once, all O(n) models now built from one file with different compiler flag settings

7 files changed, 279 insertions, 348 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f29504..98ef947 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,6 +5,7 @@ set(CMAKE_CXX_FLAGS_DEBUG "-g")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
 
 set (CMAKE_CXX_STANDARD 17)
+set (CMAKE_C_STANDARD 11)
 
 include_directories(lib ~/.local/include)
 link_directories(~/.local/lib)
@@ -13,10 +14,13 @@ file(GLOB CSOURCES lib/*.c)
 file(GLOB CPPSOURCES lib/*.cpp)
 
 add_executable(wolff_finite src/wolff_finite.c ${CSOURCES})
-add_executable(wolff_heisenberg src/wolff_heisenberg.cpp ${CPPSOURCES} ${CSOURCES})
-add_executable(wolff_planar src/wolff_planar.cpp ${CPPSOURCES} ${CSOURCES})
+add_executable(wolff_planar src/wolff_On.cpp ${CPPSOURCES} ${CSOURCES})
+add_executable(wolff_heisenberg src/wolff_On.cpp ${CPPSOURCES} ${CSOURCES})
 add_executable(analyze_correlations src/analyze_correlations.cpp ${CPPSOURCES} ${CSOURCES})
 
+SET_TARGET_PROPERTIES(wolff_planar PROPERTIES COMPILE_FLAGS "-DN_COMP=2")
+SET_TARGET_PROPERTIES(wolff_heisenberg PROPERTIES COMPILE_FLAGS "-DN_COMP=3")
+
 find_package(OpenMP)
 if (OPENMP_FOUND)
     set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
diff --git a/lib/correlation.h b/lib/correlation.h
index 5722aab..b3b7d86 100644
--- a/lib/correlation.h
+++ b/lib/correlation.h
@@ -7,29 +7,14 @@
 #include <fftw3.h>
 
 template <class R_t, class X_t>
-double correlation_length(const state_t <R_t, X_t> *s) {
-  double *data = (double *)fftw_malloc(s->nv * sizeof(double));
-  int rank = s->D;
-  int *n = (int *)malloc(rank * sizeof(int));
-  fftw_r2r_kind *kind = (fftw_r2r_kind *)malloc(rank * sizeof(fftw_r2r_kind));
-  for (D_t i = 0; i < rank; i++) {
-    n[i] = s->L;
-    kind[i] = FFTW_R2HC;
-  }
-  fftw_plan plan = fftw_plan_r2r(rank, n, data, data, kind, 0);
-
+double correlation_length(const state_t <R_t, X_t> *s, fftw_plan plan, double *in, double *out) {
   for (v_t i = 0; i < s->nv; i++) {
-    data[i] = correlation_component(s->spins[i]);
+    in[i] = correlation_component(s->spins[i]);
   }
 
   fftw_execute(plan);
 
-  double length = pow(data[0], 2);
-
-  fftw_destroy_plan(plan);
-  fftw_free(data);
-  free(n);
-  free(kind);
+  double length = pow(out[0], 2);
 
   return length;
 }
diff --git a/lib/measure.h b/lib/measure.h
new file mode 100644
index 0000000..3474684
--- /dev/null
+++ b/lib/measure.h
@@ -0,0 +1,48 @@
+
+#pragma once
+
+#define POSSIBLE_MEASUREMENTS 4
+const unsigned char measurement_energy        = 1 << 0;
+const unsigned char measurement_clusterSize   = 1 << 1;
+const unsigned char measurement_magnetization = 1 << 2;
+const unsigned char measurement_fourierZero    = 1 << 3;
+
+#ifdef __cplusplus
+
+#include "state.h"
+#include "correlation.h"
+#include <functional>
+
+template <class R_t, class X_t>
+std::function <void(const state_t <R_t, X_t> *)> measurement_energy_file(FILE *file) {
+  return [=](const state_t <R_t, X_t> *s) {
+    float smaller_E = (float)s->E;
+    fwrite(&smaller_E, sizeof(float), 1, file);
+  };
+}
+
+template <class R_t, class X_t>
+std::function <void(const state_t <R_t, X_t> *)> measurement_cluster_file(FILE *file) {
+  return [=](const state_t <R_t, X_t> *s) {
+    fwrite(&(s->last_cluster_size), sizeof(uint32_t), 1, file);
+  };
+}
+
+template <class R_t, class X_t>
+std::function <void(const state_t <R_t, X_t> *)> measurement_magnetization_file(FILE *file) {
+  return [=](const state_t <R_t, X_t> *s) {
+    write_magnetization(s->M, file);
+  };
+}
+
+template <class R_t, class X_t>
+std::function <void(const state_t <R_t, X_t> *)> measurement_fourier_file(FILE *file, fftw_plan plan, double *fftw_in, double *fftw_out) {
+  return [=](const state_t <R_t, X_t> *s) {
+    float smaller_X = (float)correlation_length(s, plan, fftw_in, fftw_out);
+    fwrite(&smaller_X, sizeof(float), 1, file);
+  };
+}
+
+#endif
+
+
diff --git a/lib/vector.h b/lib/vector.h
index 6c72fd1..2099d28 100644
--- a/lib/vector.h
+++ b/lib/vector.h
@@ -94,3 +94,6 @@ double H_vector(vector_t <q, T> v1, T *H) {
   H_vec.x = H;
   return (double)(dot <q, T> (v1, H_vec));
 }
+
+char const *ON_strings[] = {"TRIVIAL", "ISING", "PLANAR", "HEISENBERG"};
+
diff --git a/src/wolff_On.cpp b/src/wolff_On.cpp
new file mode 100644
index 0000000..336869f
--- /dev/null
+++ b/src/wolff_On.cpp
@@ -0,0 +1,219 @@
+
+#include <getopt.h>
+
+#include <wolff.h>
+#include <correlation.h>
+#include <measure.h>
+
+typedef state_t <orthogonal_t <N_COMP, double>, vector_t <N_COMP, double>> planar_t;
+
+// angle from the x-axis of a two-vector
+double theta(vector_t <N_COMP, double> v) {
+  double x = v.x[0];
+  double y = v.x[1];
+
+  double val = atan(y / x);
+
+  if (x < 0.0 && y > 0.0) {
+    return M_PI + val;
+  } else if ( x < 0.0 && y < 0.0 ) {
+    return - M_PI + val;
+  } else {
+    return val;
+  }
+}
+
+double H_modulated(vector_t <N_COMP, double> v, int order, double mag) {
+  return mag * cos(order * theta(v));
+}
+
+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_vec = (double *)calloc(MAX_Q, sizeof(double));
+
+  bool silent = false;
+  bool use_pert = false;
+
+  bool modulated_field = false;
+  int order = 2;
+
+  int opt;
+  q_t J_ind = 0;
+  q_t H_ind = 0;
+  double epsilon = 1;
+
+  unsigned char measurement_flags = 0;
+
+  while ((opt = getopt(argc, argv, "N:q:D:L:T:J:H:spe:mo:M:")) != -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 'p':
+      use_pert = true;
+      break;
+    case 'e':
+      epsilon = atof(optarg);
+      break;
+    case 'm':
+      modulated_field = true;
+      break;
+    case 'M':
+      measurement_flags |= 1 << atoi(optarg);
+      break;
+    case 'o':
+      order = atoi(optarg);
+      break;
+    default:
+      exit(EXIT_FAILURE);
+    }
+  }
+
+  unsigned long timestamp;
+
+  {
+    struct timespec spec;
+    clock_gettime(CLOCK_REALTIME, &spec);
+    timestamp = spec.tv_sec*1000000000LL + spec.tv_nsec;
+  }
+
+  const char *pert_type;
+
+  std::function <orthogonal_t <N_COMP, double>(gsl_rng *, const planar_t *)> gen_R;
+
+  if (use_pert) {
+    gen_R = std::bind(generate_rotation_perturbation <N_COMP>, std::placeholders::_1, std::placeholders::_2, epsilon);
+    pert_type = "PERTURB";
+  } else {
+    gen_R = generate_rotation_uniform <N_COMP>;
+    pert_type = "UNIFORM";
+  }
+
+
+  FILE *outfile_info = fopen("wolff_metadata.txt", "a");
+
+  fprintf(outfile_info, "<| \"ID\" -> %lu, \"MODEL\" -> \"%s\", \"q\" -> %d, \"D\" -> %" PRID ", \"L\" -> %" PRIL ", \"NV\" -> %" PRIv ", \"NE\" -> %" PRIv ", \"T\" -> %.15f, \"H\" -> {", timestamp, ON_strings[N_COMP], N_COMP, D, L, L * L, D * L * L, T);
+
+  for (q_t i = 0; i < N_COMP; i++) {
+    fprintf(outfile_info, "%.15f", H_vec[i]);
+    if (i < N_COMP - 1) {
+      fprintf(outfile_info, ", ");
+    }
+  }
+
+  fprintf(outfile_info, "}, \"GENERATOR\" -> \"%s\", \"EPS\" -> %g |>\n", pert_type, epsilon);
+
+  fclose(outfile_info);
+
+  unsigned int n_measurements = 0;
+  std::function <void(const planar_t *)> *measurements = (std::function <void(const planar_t *)> *)calloc(POSSIBLE_MEASUREMENTS, sizeof(std::function <void(const planar_t *)>));
+  FILE *outfile_M, *outfile_E, *outfile_S, *outfile_F;
+  double *fftw_in, *fftw_out;
+  fftw_plan plan;
+
+  if (measurement_flags & measurement_energy) {
+    char *filename_E = (char *)malloc(255 * sizeof(char));
+    sprintf(filename_E, "wolff_%lu_E.dat", timestamp);
+    outfile_E = fopen(filename_E, "wb");
+    free(filename_E);
+    measurements[n_measurements] = measurement_energy_file<orthogonal_t <N_COMP, double>, vector_t <N_COMP, double>> (outfile_E);
+    n_measurements++;
+  }
+
+  if (measurement_flags & measurement_clusterSize) {
+    char *filename_S = (char *)malloc(255 * sizeof(char));
+    sprintf(filename_S, "wolff_%lu_S.dat", timestamp);
+    outfile_S = fopen(filename_S, "wb");
+    free(filename_S);
+    measurements[n_measurements] = measurement_cluster_file<orthogonal_t <N_COMP, double>, vector_t <N_COMP, double>> (outfile_S);
+    n_measurements++;
+  }
+
+  if (measurement_flags & measurement_magnetization) {
+    char *filename_M = (char *)malloc(255 * sizeof(char));
+    sprintf(filename_M, "wolff_%lu_M.dat", timestamp);
+    outfile_M = fopen(filename_M, "wb");
+    free(filename_M);
+    measurements[n_measurements] = measurement_magnetization_file<orthogonal_t <N_COMP, double>, vector_t <N_COMP, double>> (outfile_M);
+    n_measurements++;
+  }
+
+  if (measurement_flags & measurement_fourierZero) {
+    char *filename_F = (char *)malloc(255 * sizeof(char));
+    sprintf(filename_F, "wolff_%lu_F.dat", timestamp);
+    outfile_F = fopen(filename_F, "wb");
+    free(filename_F);
+
+    fftw_in = (double *)fftw_malloc(pow(L, D) * sizeof(double));
+    fftw_out = (double *)fftw_malloc(pow(L, D) * sizeof(double));
+    int rank = D;
+    int *n = (int *)malloc(rank * sizeof(int));
+    fftw_r2r_kind *kind = (fftw_r2r_kind *)malloc(rank * sizeof(fftw_r2r_kind));
+    for (D_t i = 0; i < rank; i++) {
+      n[i] = L;
+      kind[i] = FFTW_R2HC;
+    }
+    plan = fftw_plan_r2r(rank, n, fftw_in, fftw_out, kind, 0);
+
+    free(n);
+    free(kind);
+
+    measurements[n_measurements] = measurement_fourier_file<orthogonal_t <N_COMP, double>, vector_t <N_COMP, double>> (outfile_F, plan, fftw_in, fftw_out);
+    n_measurements++;
+  }
+
+  std::function <double(vector_t <N_COMP, double>)> H;
+
+  if (modulated_field) {
+    H = std::bind(H_modulated, std::placeholders::_1, order, H_vec[0]);
+  } else {
+    H = std::bind(H_vector <N_COMP, double>, std::placeholders::_1, H_vec);
+  }
+
+  wolff <orthogonal_t <N_COMP, double>, vector_t <N_COMP, double>> (N, D, L, T, dot <N_COMP, double>, H, gen_R, n_measurements, measurements, silent);
+
+  free(measurements);
+
+  if (measurement_flags & measurement_energy) {
+    fclose(outfile_E);
+  }
+  if (measurement_flags & measurement_clusterSize) {
+    fclose(outfile_S);
+  }
+  if (measurement_flags & measurement_magnetization) {
+    fclose(outfile_M);
+  }
+  if (measurement_flags & measurement_fourierZero) {
+    fclose(outfile_F);
+    fftw_destroy_plan(plan);
+    fftw_free(fftw_in);
+    fftw_free(fftw_out);
+    fftw_cleanup(); // fftw is only used if fourier modes are measured!
+  }
+
+  free(H_vec);
+
+  return 0;
+}
+
diff --git a/src/wolff_heisenberg.cpp b/src/wolff_heisenberg.cpp
deleted file mode 100644
index e05453f..0000000
--- a/src/wolff_heisenberg.cpp
+++ /dev/null
@@ -1,145 +0,0 @@
-
-#include <getopt.h>
-
-#include <correlation.h>
-#include <wolff.h>
-
-typedef state_t <orthogonal_t <3, double>, vector_t <3, double>> heisenberg_t;
-
-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;
-  bool use_pert = false;
-
-  int opt;
-  q_t J_ind = 0;
-  q_t H_ind = 0;
-  double epsilon = 1;
-
-  while ((opt = getopt(argc, argv, "N:q:D:L:T:J:H:spe:")) != -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;
-    case 'p':
-      use_pert = true;
-      break;
-    case 'e':
-      epsilon = atof(optarg);
-      break;
-    default:
-      exit(EXIT_FAILURE);
-    }
-  }
-
-  unsigned long timestamp;
-
-  {
-    struct timespec spec;
-    clock_gettime(CLOCK_REALTIME, &spec);
-    timestamp = spec.tv_sec*1000000000LL + spec.tv_nsec;
-  }
-
-  std::function <orthogonal_t <3, double>(gsl_rng *, const heisenberg_t *)> gen_R;
-
-  const char *pert_type;
-
-  if (use_pert) {
-    gen_R = std::bind(generate_rotation_perturbation <3>, std::placeholders::_1, std::placeholders::_2, epsilon);
-    pert_type = "PERTURB";
-  } else {
-    gen_R = generate_rotation_uniform <3>;
-    pert_type = "UNIFORM";
-  }
-
-  FILE *outfile_info = fopen("wolff_metadata.txt", "a");
-
-  fprintf(outfile_info, "<| \"ID\" -> %lu, \"MODEL\" -> \"HEISENBERG\", \"q\" -> 3, \"D\" -> %" PRID ", \"L\" -> %" PRIL ", \"NV\" -> %" PRIv ", \"NE\" -> %" PRIv ", \"T\" -> %.15f, \"H\" -> {", timestamp, D, L, L * L, D * L * L, T);
-
-  for (q_t i = 0; i < 3; i++) {
-    fprintf(outfile_info, "%.15f", H[i]);
-    if (i < 3 - 1) {
-      fprintf(outfile_info, ", ");
-    }
-  }
-
-  fprintf(outfile_info, "}, \"GENERATOR\" -> \"%s\", \"EPS\" -> %g |>\n", pert_type, epsilon);
-
-  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));
-  char *filename_X = (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);
-  sprintf(filename_X, "wolff_%lu_X.dat", timestamp);
-
-  FILE *outfile_M = fopen(filename_M, "wb");
-  FILE *outfile_E = fopen(filename_E, "wb");
-  FILE *outfile_S = fopen(filename_S, "wb");
-  FILE *outfile_X = fopen(filename_X, "wb");
-
-  free(filename_M);
-  free(filename_E);
-  free(filename_S);
-  free(filename_X);
-
-  std::function <void(const heisenberg_t *)> *measurements = (std::function <void(const heisenberg_t *)> *)malloc(4 * sizeof(std::function <void(const heisenberg_t *)>));
-
-  measurements[0] = [&](const heisenberg_t *s) {
-    float smaller_E = (float)s->E;
-    fwrite(&smaller_E, sizeof(float), 1, outfile_E);
-  };
-  measurements[1] = [&](const heisenberg_t *s) {
-    float smaller_X = (float)correlation_length(s);
-    fwrite(&smaller_X, sizeof(float), 1, outfile_X);
-  };
-  measurements[2] = [&](const heisenberg_t *s) {
-    write_magnetization(s->M, outfile_M);
-  };
-  measurements[3] = [&](const heisenberg_t *s) {
-    fwrite(&(s->last_cluster_size), sizeof(uint32_t), 1, outfile_S);
-  };
-
-  wolff <orthogonal_t <3, double>, vector_t <3, double>> (N, D, L, T, dot <3, double>, std::bind(H_vector <3, double>, std::placeholders::_1, H), gen_R, 4, measurements, silent);
-
-  free(measurements);
-
-  fclose(outfile_M);
-  fclose(outfile_E);
-  fclose(outfile_S);
-  fclose(outfile_X);
-
-  free(H);
-
-  fftw_cleanup();
-
-  return 0;
-}
-
diff --git a/src/wolff_planar.cpp b/src/wolff_planar.cpp
deleted file mode 100644
index 4b9b5f0..0000000
--- a/src/wolff_planar.cpp
+++ /dev/null
@@ -1,183 +0,0 @@
-
-#include <getopt.h>
-
-#include <wolff.h>
-#include <correlation.h>
-
-typedef state_t <orthogonal_t <2, double>, vector_t <2, double>> planar_t;
-
-// angle from the x-axis of a two-vector
-double theta(vector_t <2, double> v) {
-  double x = v.x[0];
-  double y = v.x[1];
-
-  double val = atan(y / x);
-
-  if (x < 0.0 && y > 0.0) {
-    return M_PI + val;
-  } else if ( x < 0.0 && y < 0.0 ) {
-    return - M_PI + val;
-  } else {
-    return val;
-  }
-}
-
-double H_modulated(vector_t <2, double> v, int order, double mag) {
-  return mag * cos(order * theta(v));
-}
-
-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_vec = (double *)calloc(MAX_Q, sizeof(double));
-
-  bool silent = false;
-  bool use_pert = false;
-
-  bool modulated_field = false;
-  int order = 2;
-
-  int opt;
-  q_t J_ind = 0;
-  q_t H_ind = 0;
-  double epsilon = 1;
-
-  while ((opt = getopt(argc, argv, "N:q:D:L:T:J:H:spe:mo:")) != -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 'p':
-      use_pert = true;
-      break;
-    case 'e':
-      epsilon = atof(optarg);
-      break;
-    case 'm':
-      modulated_field = true;
-      break;
-    case 'o':
-      order = atoi(optarg);
-      break;
-    default:
-      exit(EXIT_FAILURE);
-    }
-  }
-
-  unsigned long timestamp;
-
-  {
-    struct timespec spec;
-    clock_gettime(CLOCK_REALTIME, &spec);
-    timestamp = spec.tv_sec*1000000000LL + spec.tv_nsec;
-  }
-
-  const char *pert_type;
-
-  std::function <orthogonal_t <2, double>(gsl_rng *, const planar_t *)> gen_R;
-
-  if (use_pert) {
-    gen_R = std::bind(generate_rotation_perturbation <2>, std::placeholders::_1, std::placeholders::_2, epsilon);
-    pert_type = "PERTURB";
-  } else {
-    gen_R = generate_rotation_uniform <2>;
-    pert_type = "UNIFORM";
-  }
-
-
-  FILE *outfile_info = fopen("wolff_metadata.txt", "a");
-
-  fprintf(outfile_info, "<| \"ID\" -> %lu, \"MODEL\" -> \"PLANAR\", \"q\" -> 2, \"D\" -> %" PRID ", \"L\" -> %" PRIL ", \"NV\" -> %" PRIv ", \"NE\" -> %" PRIv ", \"T\" -> %.15f, \"H\" -> {", timestamp, D, L, L * L, D * L * L, T);
-
-  for (q_t i = 0; i < 2; i++) {
-    fprintf(outfile_info, "%.15f", H_vec[i]);
-    if (i < 2 - 1) {
-      fprintf(outfile_info, ", ");
-    }
-  }
-
-  fprintf(outfile_info, "}, \"GENERATOR\" -> \"%s\", \"EPS\" -> %g |>\n", pert_type, epsilon);
-
-  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));
-  char *filename_X = (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);
-  sprintf(filename_X, "wolff_%lu_X.dat", timestamp);
-
-  FILE *outfile_M = fopen(filename_M, "wb");
-  FILE *outfile_E = fopen(filename_E, "wb");
-  FILE *outfile_S = fopen(filename_S, "wb");
-  FILE *outfile_X = fopen(filename_X, "wb");
-
-  free(filename_M);
-  free(filename_E);
-  free(filename_S);
-  free(filename_X);
-
-  std::function <void(const planar_t *)> *measurements = (std::function <void(const planar_t *)> *)calloc(4, sizeof(std::function <void(const planar_t *)>));
-
-  measurements[0] = (std::function <void(const planar_t *)>)[&](const planar_t *s) {
-    float smaller_E = (float)s->E;
-    fwrite(&smaller_E, sizeof(float), 1, outfile_E);
-  };
-  measurements[1] = [&](const planar_t *s) {
-    float smaller_X = (float)correlation_length(s);
-    fwrite(&smaller_X, sizeof(float), 1, outfile_X);
-  };
-  measurements[2] = [&](const planar_t *s) {
-    write_magnetization(s->M, outfile_M);
-  };
-  measurements[3] = [&](const planar_t *s) {
-    fwrite(&(s->last_cluster_size), sizeof(uint32_t), 1, outfile_S);
-  };
-
-  std::function <double(vector_t <2, double>)> H;
-
-  if (modulated_field) {
-    H = std::bind(H_modulated, std::placeholders::_1, order, H_vec[0]);
-  } else {
-    H = std::bind(H_vector <2, double>, std::placeholders::_1, H_vec);
-  }
-
-  wolff <orthogonal_t <2, double>, vector_t <2, double>> (N, D, L, T, dot <2, double>, H, gen_R, 4, measurements, silent);
-
-  free(measurements);
-
-  fclose(outfile_M);
-  fclose(outfile_E);
-  fclose(outfile_S);
-  fclose(outfile_X);
-
-  free(H_vec);
-
-  fftw_cleanup();
-
-  return 0;
-}
-