From cd5ec90e72f2a8607ef59ce1b4d75c3671b97fda Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Thu, 12 Sep 2019 14:06:07 -0400
Subject: now just measure averages

---
 sample_ising.cpp | 91 ++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 69 insertions(+), 22 deletions(-)

diff --git a/sample_ising.cpp b/sample_ising.cpp
index 8e52017..0a8e952 100644
--- a/sample_ising.cpp
+++ b/sample_ising.cpp
@@ -9,41 +9,68 @@
 
 using namespace wolff;
 
+class track : public measurement<ising_t, ising_t, graph<>> {
+public:
+  int e;
+  int m;
+  track(const wolff::system<ising_t, ising_t, graph<>>& s) {
+    e = -s.ne;
+    m = s.nv;
+  }
+
+  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 {
+    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 -= 2 * (si_new * s.s[ed.neighbor.ind]);
+  }
+};
+
 class sample : public measurement<ising_t, ising_t, graph<>> {
 private:
-  typedef struct _dat {
-    int e;
-    int m;
-  } dat;
-  std::ofstream e_file;
-  dat e;
+  int e;
+  int m;
+  int64_t e_tot;
+  int64_t m_tot;
+  unsigned N;
 
 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(int eold, int mold) {
+    e = eold;
+    m = mold;
+    e_tot = 0;
+    m_tot = 0;
+    N = 0;
   }
 
-  ~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;
+    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]);
+    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));
+    e_tot += e;
+    m_tot += m;
+    N++;
+  }
+
+  double e_avg() const {
+    return ((double)e_tot) / N;
+  }
+
+  double m_avg() const {
+    return ((double)m_tot) / N;
   }
 };
 
@@ -55,11 +82,12 @@ int main(int argc, char* argv[]) {
   unsigned L = 128;
   double T = 2 / log(1 + sqrt(2));
   double H = 0;
+  double w = 1.0;
 
   int opt;
 
   // take command line arguments
-  while ((opt = getopt(argc, argv, "N:D:L:T:H:")) != -1) {
+  while ((opt = getopt(argc, argv, "N:D:L:T:H:w:")) != -1) {
     switch (opt) {
     case 'N': // number of steps
       N = (unsigned)atof(optarg);
@@ -76,11 +104,16 @@ int main(int argc, char* argv[]) {
     case 'H': // field
       H = atof(optarg);
       break;
+    case 'w':
+      w = atof(optarg);
+      break;
     default:
       exit(EXIT_FAILURE);
     }
   }
 
+  unsigned N_wait = w * pow(L, D);
+
   // 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); };
@@ -104,11 +137,25 @@ int main(int argc, char* argv[]) {
       gen_r = gen_ising<graph<>>;
 
   // initailze the measurement object
-  sample A(S, D, L, T, H);
-
-  // run wolff N times
+  track AA(S);
+  S.run_wolff(N_wait, gen_r, AA, rng);
+  sample A(AA.e, AA.m);
   S.run_wolff(N, gen_r, A, rng);
 
+  std::ifstream checkfile("out.dat");
+  bool already_exists = checkfile.good();
+  if (already_exists) {
+    checkfile.close();
+  }
+
+  std::ofstream outfile;
+  outfile.open("out.dat", std::ios::app);
+  if (!already_exists) {
+    outfile << "N D L T H E M\n";
+  }
+  outfile << N << " " << D << " " << L << " " << T << " " << H << " " << A.e_avg() / S.nv << " " << A.m_avg() / S.nv << "\n";
+  outfile.close();
+
   // exit
   return 0;
 }
-- 
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