From 02bff5563d5a0150bde4ae3de9222a1837aefa98 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Mon, 10 Oct 2022 20:49:04 +0200
Subject: Merged Graph and AztecDiamond classes.

---
 uniform.cpp | 113 +++++-------------------------------------------------------
 1 file changed, 8 insertions(+), 105 deletions(-)

(limited to 'uniform.cpp')

diff --git a/uniform.cpp b/uniform.cpp
index 2c123ff..c6f7869 100644
--- a/uniform.cpp
+++ b/uniform.cpp
@@ -4,101 +4,6 @@
 
 #include "rbmp.hpp"
 
-using Real = long double;
-
-class AztecDiamond {
-
-public:
-  typedef struct Edge {
-    std::stack<Real> weights;
-    Real probability = 0;
-  } Edge;
-
-private:
-  std::tuple<Edge&, Edge&, Edge&, Edge&> face(unsigned i, unsigned j) {
-    unsigned x0 = n - i;
-    unsigned xx = 2 * (j % i);
-    unsigned yy = 2 * (j / i);
-
-    Edge& e1 = edges[2 * n * (x0 + yy) + x0 + xx];
-    Edge& e2 = edges[2 * n * (x0 + yy) + x0 + xx + 1];
-    Edge& e3 = edges[2 * n * (x0 + yy + 1) + x0 + xx];
-    Edge& e4 = edges[2 * n * (x0 + yy + 1) + x0 + xx + 1];
-
-    return {e1, e2, e3, e4};
-  }
-
-public:
-  unsigned n;
-  std::vector<Edge> edges;
-
-  AztecDiamond(unsigned n) : edges(pow(2 * n, 2)), n(n) {}
-
-  void computeWeights() {
-    for (unsigned i = n; i > 0; i--) {
-#pragma omp parallel for
-      for (unsigned j = 0; j < pow(i, 2); j++) {
-        auto [e1, e2, e3, e4] = face(i, j);
-
-        Real w = e1.weights.top();
-        Real x = e2.weights.top();
-        Real y = e3.weights.top();
-        Real z = e4.weights.top();
-
-        Real cellFactor = w * z + x * y;
-
-        e1.weights.push(z / cellFactor);
-        e2.weights.push(y / cellFactor);
-        e3.weights.push(x / cellFactor);
-        e4.weights.push(w / cellFactor);
-      }
-    }
-
-    // This process computes one extra weight per edge.
-    for (Edge& e : edges) {
-      e.weights.pop();
-    }
-  }
-
-  Real computeProbabilities() { // destroys *all* weights
-    Real partitionFunction = 1;
-
-    for (unsigned i = 1; i <= n; i++) {
-#pragma omp parallel for
-      for (unsigned j = 0; j < pow(i, 2); j++) {
-        auto [e1, e2, e3, e4] = face(i, j);
-
-        Real p = e1.probability;
-        Real q = e2.probability;
-        Real r = e3.probability;
-        Real s = e4.probability;
-
-        Real w = e1.weights.top();
-        Real x = e2.weights.top();
-        Real y = e3.weights.top();
-        Real z = e4.weights.top();
-
-        Real cellFactor = w * z + x * y;
-        Real deficit = 1 - p - q - r - s;
-
-        e1.probability = s + deficit * w * z / cellFactor;
-        e2.probability = r + deficit * x * y / cellFactor;
-        e3.probability = q + deficit * x * y / cellFactor;
-        e4.probability = p + deficit * w * z / cellFactor;
-
-        e1.weights.pop();
-        e2.weights.pop();
-        e3.weights.pop();
-        e4.weights.pop();
-
-        partitionFunction *= cellFactor;
-      }
-    }
-
-    return partitionFunction;
-  }
-};
-
 int main(int argc, char* argv[]) {
   unsigned n = 100;
   unsigned m = 100;
@@ -125,7 +30,7 @@ int main(int argc, char* argv[]) {
   std::string filename = "order_" + std::to_string(n) + "_" + std::to_string(T) + ".dat";
 
   Rng r;
-  AztecDiamond a(n);
+  AztecDiamond a(n, r);
 
   std::vector<Real> avgProbabilities(a.edges.size());
 
@@ -142,15 +47,13 @@ int main(int argc, char* argv[]) {
     }
   }
 
-  Graph G(n, r);
-
-  std::vector<Real> data_x(G.vertices.size());
-  std::vector<Real> data_y(G.vertices.size());
+  std::vector<Real> data_x(a.vertices.size());
+  std::vector<Real> data_y(a.vertices.size());
 
-  for (unsigned i = 0; i < G.edges.size(); i++) {
-    const Graph::Edge& e = G.edges[i];
-    const Graph::Vertex& vt = e.halfedges[0].getTail();
-    const Graph::Vertex& vh =  e.halfedges[0].getHead();
+  for (unsigned i = 0; i < a.edges.size(); i++) {
+    const AztecDiamond::Edge& e = a.edges[i];
+    const AztecDiamond::Vertex& vt = *e.tail;
+    const AztecDiamond::Vertex& vh =  *e.head;
     data_x[vt.index] += avgProbabilities[i] * (vt.coordinate[0] - vh.coordinate[0]);
     data_y[vt.index] += avgProbabilities[i] * (vt.coordinate[1] - vh.coordinate[1]);
     data_x[vh.index] += avgProbabilities[i] * (vt.coordinate[0] - vh.coordinate[0]);
@@ -159,7 +62,7 @@ int main(int argc, char* argv[]) {
 
   std::ofstream output(filename);
 
-  for (unsigned i = 0; i < G.vertices.size(); i++) {
+  for (unsigned i = 0; i < a.vertices.size(); i++) {
     output << data_x[i] << " " << data_y[i] << std::endl;
   }
 
-- 
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