+#ifndef OBS_PLAQ_HPP
+#define OBS_PLAQ_HPP
+
+#include "latlib/o815/o815.h"
+
+#include "latlib/writeout.h"
+
+#include "latlib/obstat.hpp"
+
+#include <iostream>
+
+using namespace std;
+
+class obs_plaq : public o815::obs {
+
+public:
+ struct obsmem {
+ double plaq;
+ };
+ obs_plaq(o815 *_O815);
+
+private:
+ void _start();
+ void _meas(bool loadedobs, const int& nthmeas);
+ void _finish();
+
+ obsmem* OM;
+
+ void plaqCompute();
+ static double plaqSus(vector< vector<double> > *vals, void *para);
+
+ sim *Sim;
+ obstat<double,double> oPlaq;
+};
+
+obs_plaq::obs_plaq(o815 *_O815) : o815::obs("plaq",
+ _O815->paraQ->getParaNames() + "plaq:plaq_err:plaqsus:plaqsus_err",
+ _O815, sizeof(obsmem) ) {
+ OM = (obsmem*)obsMem;
+ Sim = (sim*)O815->Sim;
+}
+
+void obs_plaq::_start() {
+ //*out << "OBS_test: start" << endl;
+};
+
+void obs_plaq::_meas(bool loadedobs, const int& nthmeas) {
+ if (!loadedobs)
+ plaqCompute();
+
+ oPlaq.addMeas(OM->plaq);
+};
+
+void obs_plaq::_finish() {
+ *out << O815->paraQ->getParaVals();
+
+ int compid_plaq, compid_plaqsus;
+
+ compid_plaq = oPlaq.computeEasy();
+ compid_plaqsus = oPlaq.computeJack(obs_plaq::plaqSus, &(Sim->lsize4));
+
+ *out << "\t" << oPlaq.getMean(compid_plaq) << "\t" << oPlaq.getErr(compid_plaq);
+ *out << "\t" << oPlaq.getMean(compid_plaqsus) << "\t" << oPlaq.getErr(compid_plaqsus);
+
+ *out << endl;
+
+ oPlaq.reset();
+};
+
+void obs_plaq::plaqCompute()
+{
+ OM->plaq = 0;
+
+ for( int ix=0; ix<Sim->lsize4; ix++ )
+ for( int inu=0; inu<3; inu++ )
+ for( int isigma=inu+1; isigma<4; isigma++ ) {
+ OM->plaq += real( Sim->U[ ix*4 + inu ] * Sim->U[ (*Sim->nb)[ix*8+inu]*4 + isigma ]
+ * conj(Sim->U[ (*Sim->nb)[ix*8+isigma]*4 + inu ]) * conj(Sim->U[ ix*4 + isigma ]) );
+ }
+
+ OM->plaq /= Sim->lsize4*6;
+}
+
+double obs_plaq::plaqSus(vector< vector<double> > *vals, void *para) {
+ double mean=0, mean2=0;
+ for(vector< vector<double> >::iterator valIt = vals->begin(); valIt != vals->end(); ++valIt)
+ {
+ mean += (*valIt)[0];
+ mean2 += pow((*valIt)[0],2);
+ }
+ mean /= vals->size();
+ mean2 /= vals->size();
+
+ return ( mean2 - pow(mean,2) ) * *(int*)para * 6;
+}
+
+#endif