From 833e325c0a5531d07b9b9deed0201b26a5152e51 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Wed, 11 Dec 2019 09:50:13 -0500
Subject: added support in parallel tempering for specifying different
 densities of temperatures in different intervals

---
 hadamard.cpp    |  4 +++-
 hadamard_pt.hpp | 18 +++++++++++++-----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/hadamard.cpp b/hadamard.cpp
index b8ebdde..9364d3c 100644
--- a/hadamard.cpp
+++ b/hadamard.cpp
@@ -104,7 +104,9 @@ int main(int argc, char* argv[]) {
   }
   MeasureTransitionRates B(num);
 
-  PT p(β0, βf, num, n, B, As);
+  range r = {β0, βf, num};
+
+  PT p({r}, n, B, As);
 
   for (MCMC& sim : p.Ms) {
     sim.M = walsh(k);
diff --git a/hadamard_pt.hpp b/hadamard_pt.hpp
index 404129c..744c866 100644
--- a/hadamard_pt.hpp
+++ b/hadamard_pt.hpp
@@ -1,6 +1,7 @@
 
 #pragma once
 #include "hadamard_mcmc.hpp"
+#include <list>
 
 void swap(MCMC& s1, MCMC& s2) {
   std::swap(s1.M, s2.M);
@@ -13,6 +14,12 @@ public:
   virtual void after_sweep(const std::vector<MCMC>&){};
 };
 
+typedef struct range {
+  double β0;
+  double β1;
+  unsigned N;
+} range;
+
 class PT {
 private:
   randutils::mt19937_rng rng;
@@ -22,13 +29,14 @@ public:
   ParallelMeasurement& B;
   std::vector<Measurement*>& As;
 
-  PT(double β0, double β1, unsigned N, unsigned n, ParallelMeasurement& B,
+  PT(std::list<range> ranges, unsigned n, ParallelMeasurement& B,
      std::vector<Measurement*>& As)
       : B(B), As(As) {
-    Ms.reserve(N);
-    for (unsigned i = 0; i < N; i++) {
-      double β = β0 + i * (β1 - β0) / (N - 1);
-      Ms.push_back(MCMC(n, β, *As[i]));
+    for (range r : ranges) {
+      for (unsigned i = 0; i < r.N; i++) {
+        double β = r.β0 + i * (r.β1 - r.β0) / (r.N - 1);
+        Ms.push_back(MCMC(n, β, *As[i]));
+      }
     }
   }
 
-- 
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