hadamard_time.cpp


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#include "hadamard_mcmc.hpp"
#include <iostream>

class MeasureEnergy : public Measurement {
  private:
    unsigned N;
    double totalE;

  public:
    MeasureEnergy() {
      N = 0;
      totalE = 0;
    }

    void after_sweep(double, double E, const Orthogonal&) override {
      totalE += E;
      N++;
    }

    double energy() const {
      return totalE / N;
    }
};

int main() {
  MeasureEnergy A;
  MCMC sim(20, 6.0, A);
  sim.tune(1e4, 0.01);
  sim.run(1e4);

  std::cout << "The average energy was " << A.energy() << ".";

  return 0;
}