initial commit

4 files changed, 123 insertions, 0 deletions

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..09d63cc
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "randutils"]
+	path = randutils
+	url = https://gist.github.com/imneme/540829265469e673d045
+[submodule "wolff"]
+	path = wolff
+	url = https://git.kent-dobias.com/wolff
diff --git a/randutils b/randutils
new file mode 160000
+Subproject 8486a610a954a8248c12485fb4cfc390a5f5f85
diff --git a/sample.cpp b/sample.cpp
new file mode 100644
index 0000000..71ee533
--- /dev/null
+++ b/sample.cpp
@@ -0,0 +1,117 @@
+
+#include <getopt.h>
+#include <fstream>
+
+#include "randutils/randutils.hpp"
+
+#define WOLFF_NO_FIELD
+#define WOLFF_USE_FINITE_STATES
+#include "wolff/lib/wolff_models/ising.hpp"
+#include "wolff/lib/wolff.hpp"
+
+using namespace wolff;
+
+class sample : public measurement<ising_t, ising_t, graph<>> {
+  private:
+    typedef struct _dat {
+      int e;
+      int m;
+    } dat;
+    std::ofstream e_file;
+    dat e;
+    unsigned w;
+    unsigned N;
+    unsigned τ;
+  public:
+    sample(const wolff::system<ising_t, ising_t, graph<>> &s, unsigned D, unsigned L, double T, unsigned wait) {
+      e_file.open("sample_" + std::to_string(D) + "_" + std::to_string(L) + "_" + std::to_string(T) + ".bin" , std::ios::out | std::ios::binary | std::ios::app);
+      e.e = - s.ne;
+      e.m = s.nv;
+      N = 0;
+      τ = 2 * (unsigned)ceil(pow(L, 0.3));
+      w = wait;
+    }
+
+    ~sample() {
+      e_file.close();
+    }
+
+    void plain_site_transformed(const wolff::system<ising_t, ising_t, graph<>>&, const typename graph<>::vertex&, const ising_t& si_new) override {
+      e.m += (unsigned)2 * si_new;
+    }
+
+    void plain_bond_visited(const wolff::system<ising_t, ising_t, graph<>>&s, const typename graph<>::halfedge& ed, const ising_t& si_new, double dE) override {
+      e.e -= 2 * (si_new * s.s[ed.neighbor.ind]);
+    }
+
+    void post_cluster(unsigned n, unsigned, const wolff::system<ising_t, ising_t, graph<>>&) override {
+      if (N >= w && (N - w) % τ == 0) {
+        e_file.write((char *)&e, 2 * sizeof(int));
+      }
+
+      N++;
+    }
+};
+
+int main(int argc, char *argv[]) {
+
+  // set defaults
+  unsigned N = (unsigned)1e4;
+  unsigned w = (unsigned)1e3;
+  unsigned D = 2;
+  unsigned L = 128;
+  double T = 2 / log(1 + sqrt(2));
+
+  int opt;
+
+  // take command line arguments
+  while ((opt = getopt(argc, argv, "N:D:L:T:w:")) != -1) {
+    switch (opt) {
+    case 'N': // number of steps
+      N = (unsigned)atof(optarg);
+      break;
+    case 'w': // number of steps
+      w = (unsigned)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;
+    default:
+      exit(EXIT_FAILURE);
+    }
+  }
+
+  // define the spin-spin coupling
+  std::function <double(const ising_t&, const ising_t&)> Z = [] (const ising_t& s1, const ising_t& s2) -> double {
+    return (double)(s1 * s2);
+  };
+
+  // initialize the lattice
+  graph<> G(D, L);
+
+  // initialize the system
+  wolff::system<ising_t, ising_t, graph<>> S(G, T, Z);
+
+  // initialize the random number generator
+  randutils::auto_seed_128 seeds;
+  std::mt19937 rng{seeds};
+
+  // define function that generates self-inverse rotations
+  std::function <ising_t(std::mt19937&, const wolff::system<ising_t, ising_t, graph<>>&, const graph<>::vertex&)> gen_r = gen_ising<graph<>>;
+
+  // initailze the measurement object
+  sample A(S, D, L, T, w);
+
+  // run wolff N times
+  S.run_wolff(N, gen_r, A, rng);
+
+  // exit
+  return 0;
+}
+
diff --git a/wolff b/wolff
new file mode 160000
+Subproject 49ac78a6c04e215950bc9c0f97368605e63da15