From 352e1be1bf05de2ba75f93b8375ac52036c8203e Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Tue, 4 Oct 2022 12:37:14 +0200
Subject: Refactored base code and added new utility to measure the order
 paremeter.

---
 excitation.cpp | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 excitation.cpp

(limited to 'excitation.cpp')

diff --git a/excitation.cpp b/excitation.cpp
new file mode 100644
index 0000000..05cb8c6
--- /dev/null
+++ b/excitation.cpp
@@ -0,0 +1,94 @@
+#include <iostream>
+
+#include "rbmp.hpp"
+
+int main(int argc, char* argv[]) {
+  unsigned n = 100;
+
+  int opt;
+
+  while ((opt = getopt(argc, argv, "n:")) != -1) {
+    switch (opt) {
+    case 'n':
+      n = atoi(optarg);
+      break;
+    default:
+      exit(1);
+    }
+  }
+
+  Rng r;
+  Graph G(n, r);
+
+  PerfectMatching pm(G.vertices.size(), G.edges.size());
+
+  for (const Edge& e : G.edges) {
+    pm.AddEdge(e.halfedges[0].getHead().index, e.halfedges[0].getTail().index, e.weight);
+  }
+
+  pm.options.verbose = false;
+  pm.Solve();
+
+  std::cout << n << std::endl;
+
+  for (unsigned i = 0; i < G.vertices.size() / 2; i++) {
+    unsigned j1 = pm.GetMatch(i);
+
+    std::cout
+      << G.vertices[i].coordinate[0] << " "
+      << G.vertices[i].coordinate[1] << " "
+      << G.vertices[j1].coordinate[0] << " "
+      << G.vertices[j1].coordinate[1] << std::endl;
+  }
+
+  std::vector<bool> matching(G.edges.size());
+
+  for (unsigned i = 0; i < G.edges.size(); i++) {
+    matching[i] = edgeMatched(pm, G.edges[i]);
+  }
+
+
+  while (true) {
+    unsigned eFlip = r.variate<unsigned, std::uniform_int_distribution>(0, G.edges.size() - 1);
+
+    while (!matching[eFlip]) {
+      eFlip = r.variate<unsigned, std::uniform_int_distribution>(0, G.edges.size() - 1);
+    }
+
+    pm.StartUpdate();
+    pm.UpdateCost(eFlip, 1e10);
+    pm.FinishUpdate();
+
+    pm.Solve();
+
+    unsigned m = 0;
+    for (unsigned i = 0; i < G.edges.size(); i++) {
+      if (!matching[i] && edgeMatched(pm, G.edges[i])) {
+        m++;
+      }
+    }
+
+    if (m > 4 * n) {
+      std::cerr << "Size of excitation: " << m << std::endl;
+      break;
+    } else {
+      pm.StartUpdate();
+      pm.UpdateCost(eFlip, -1e10);
+      pm.FinishUpdate();
+
+      pm.Solve();
+    }
+  }
+
+  for (unsigned i = 0; i < G.edges.size(); i++) {
+    if (!matching[i] && edgeMatched(pm, G.edges[i])) {
+      std::cout
+        << G.edges[i].halfedges[0].getTail().coordinate[0] << " "
+        << G.edges[i].halfedges[0].getTail().coordinate[1] << " "
+        << G.edges[i].halfedges[0].getHead().coordinate[0] << " "
+        << G.edges[i].halfedges[0].getHead().coordinate[1] << std::endl;
+    }
+  }
+
+  return 0;
+}
-- 
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