From 72e7dbdebedbea61e4d9d984fb03843ce9fe2b7e Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Mon, 9 Sep 2019 16:29:20 -0400
Subject: streamlining

---
 sample_ising.cpp | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 sample_ising.cpp

(limited to 'sample_ising.cpp')

diff --git a/sample_ising.cpp b/sample_ising.cpp
new file mode 100644
index 0000000..8e52017
--- /dev/null
+++ b/sample_ising.cpp
@@ -0,0 +1,115 @@
+
+#include <fstream>
+#include <getopt.h>
+
+#include "randutils/randutils.hpp"
+
+#define WOLFF_USE_FINITE_STATES
+#include "wolff/lib/wolff_models/ising.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;
+
+public:
+  sample(const wolff::system<ising_t, ising_t, graph<>>& s, unsigned D, unsigned L, double T,
+         double H) {
+    e_file.open("sample_" + std::to_string(D) + "_" + std::to_string(L) + "_" + std::to_string(T) +
+                    "_" + std::to_string(H) + ".bin",
+                std::ios::out | std::ios::binary | std::ios::app);
+    e.e = -s.ne;
+    e.m = s.nv;
+  }
+
+  ~sample() { e_file.close(); }
+
+  void ghost_bond_visited(const system<ising_t, ising_t, graph<>>&, const typename graph<>::vertex&,
+                          const ising_t& s_old, const ising_t& s_new, double dE) override {
+    e.m += s_new - s_old;
+  }
+
+  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 {
+    e_file.write((char*)&e, 2 * sizeof(int));
+  }
+};
+
+int main(int argc, char* argv[]) {
+
+  // set defaults
+  unsigned N = (unsigned)1e4;
+  unsigned D = 2;
+  unsigned L = 128;
+  double T = 2 / log(1 + sqrt(2));
+  double H = 0;
+
+  int opt;
+
+  // take command line arguments
+  while ((opt = getopt(argc, argv, "N:D:L:T:H:")) != -1) {
+    switch (opt) {
+    case 'N': // number of steps
+      N = (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;
+    case 'H': // field
+      H = 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); };
+
+  // define the spin-field coupling
+  std::function<double(const ising_t&)> B = [=](const ising_t& s) -> double { return H * s; };
+
+  // initialize the lattice
+  graph<> G(D, L);
+
+  // initialize the system
+  wolff::system<ising_t, ising_t, graph<>> S(G, T, Z, B);
+
+  // 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, H);
+
+  // run wolff N times
+  S.run_wolff(N, gen_r, A, rng);
+
+  // exit
+  return 0;
+}
+
-- 
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