From 7b4ab37cc6c728b399e9279e186c9d6c596ef523 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Fri, 26 Jul 2019 15:20:27 -0400
Subject: split into different files, added command line interface, and
 implemented hard spheres

---
 spheres.cpp | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 spheres.cpp

(limited to 'spheres.cpp')

diff --git a/spheres.cpp b/spheres.cpp
new file mode 100644
index 0000000..106ce4e
--- /dev/null
+++ b/spheres.cpp
@@ -0,0 +1,104 @@
+
+#include "space_wolff.hpp"
+
+int main(int argc, char* argv[]) {
+  const unsigned D = 2;
+
+  double L = 32;
+  unsigned N = 1000;
+  double T = 2.0 / log(1.0 + sqrt(2.0));
+  double H = 1.0;
+  unsigned n = 25;
+
+  int opt;
+
+  while ((opt = getopt(argc, argv, "n:N:L:T:H:")) != -1) {
+    switch (opt) {
+      case 'n': 
+        n = (unsigned)atof(optarg);
+        break;
+      case 'N': 
+        N = (unsigned)atof(optarg);
+        break;
+      case 'L':
+        L = atof(optarg);
+        break;
+      case 'T':
+        T = atof(optarg);
+        break;
+      case 'H':
+        H = atof(optarg);
+        break;
+      default:
+        exit(1);
+    }
+  }
+
+  std::function<double(spin<double, D, double>, spin<double, D, double>)> Z =
+    [L] (spin<double, D, double> s1, spin<double, D, double> s2) -> double {
+      vector<double, D> diff = s1.x - s2.x;
+      for (unsigned i = 0; i < D; i++) {
+        if (fabs(diff(i)) > L / 2) {
+          diff(i) = L - fabs(diff(i));
+        } else {
+          diff(i) = fabs(diff(i));
+        }
+      }
+      if (diff.transpose() * diff < pow(s1.s + s2.s, 2)) {
+        return -std::numeric_limits<double>::infinity();
+      } else {
+        return 0;
+      }
+    };
+
+  std::function<double(spin<double, D, double>)> B =
+    [L, H] (spin<double, D, double> s) -> double {
+      return H * sin(2 * M_PI * 3 * s.x(0) / L);
+    };
+
+  std::function<std::set<unsigned>(model<double, D, double>&, unsigned, spin<double, D, double>)> neighbors =
+    [] (model<double, D, double>& m, unsigned i0, spin<double, D, double> s1) -> std::set<unsigned> {
+      std::set<unsigned> nn;
+      if (i0 < m.s.size()) {
+        std::set<unsigned> os1 = m.dict.on_site(s1.x);
+        std::set<unsigned> nn0 = m.dict.nearest_neighbors(m.s[i0].x);
+        std::set<unsigned> nn1 = m.dict.nearest_neighbors(s1.x);
+        std::set<unsigned> nnn0 = m.dict.next_nearest_neighbors(m.s[i0].x);
+        std::set<unsigned> nnn1 = m.dict.next_nearest_neighbors(s1.x);
+        nn.insert(nn0.begin(), nn0.end());
+        nn.insert(nn1.begin(), nn1.end());
+        nn.insert(nnn0.begin(), nnn0.end());
+        nn.insert(nnn1.begin(), nnn1.end());
+        nn.insert(os1.begin(), os1.end());
+        nn.insert(m.s.size());
+      } else {
+        for (unsigned i = 0; i < m.s.size(); i++) {
+          nn.insert(i);
+        }
+      }
+      return nn;
+    };
+
+  model<double, D, double> sphere(L, Z, B, neighbors);
+
+  randutils::auto_seed_128 seeds;
+  std::mt19937 rng{seeds};
+
+  std::uniform_real_distribution<double> dist(0.0, L);
+
+  for (unsigned i = 0; i < n; i++) {
+    vector<double, D> pos = {dist(rng), dist(rng)};
+    sphere.s.push_back({pos, 0.5});
+    sphere.dict.record<double>(pos, i);
+  }
+
+  sphere.wolff(T, N, rng);
+
+  for (spin<double, D, double> s : sphere.s) {
+    spin<double, D, double> rs = sphere.s0.inverse().act(s);
+    std::cout << s.x.transpose() << "\n";
+  }
+
+  return 0;
+}
+
-- 
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