X-Git-Url: http://git.treefish.org/~alex/phys/u1casc.git/blobdiff_plain/2e386c299748632e6d8cfc9da61f0148b58ae917..85cb7253b975501063e89285d46824d0988b82ee:/u1casc-ordinary/obs_phi2.hpp

diff --git a/u1casc-ordinary/obs_phi2.hpp b/u1casc-ordinary/obs_phi2.hpp
index 9afc390..3e4fe48 100644
--- a/u1casc-ordinary/obs_phi2.hpp
+++ b/u1casc-ordinary/obs_phi2.hpp
@@ -27,7 +27,9 @@ private:
   obsmem* OM;
 
   void phi2Compute();
-  static double phi2Sus(vector< vector<double> > *vals, void *para);
+
+  static void prePhi2Sus(vector< vector <double> > *allVals, vector <double> *preCalculated, void *para);
+  static double phi2Sus(vector <double> *preCalculated, vector<double> *excludedMeas, int nmeas, void *para);
 
   sim *Sim;
   obstat<double,double> oPhi2[2];
@@ -61,7 +63,7 @@ void obs_phi2::_finish() {
 
   for (int iflav=0; iflav<2; iflav++) {
     compid_phi2[iflav] = oPhi2[iflav].computeEasy();
-    compid_phi2sus[iflav] = oPhi2[iflav].computeJack(obs_phi2::phi2Sus, &(Sim->lsize4));
+    compid_phi2sus[iflav] = oPhi2[iflav].computeJack(obs_phi2::prePhi2Sus, obs_phi2::phi2Sus, &(Sim->lsize4));
 
     *out << "\t" << oPhi2[iflav].getMean(compid_phi2[iflav]) << "\t" << oPhi2[iflav].getErr(compid_phi2[iflav]);
     *out << "\t" << oPhi2[iflav].getMean(compid_phi2sus[iflav]) << "\t" << oPhi2[iflav].getErr(compid_phi2sus[iflav]);
@@ -84,17 +86,21 @@ void obs_phi2::phi2Compute()
   }
 }
 
-double obs_phi2::phi2Sus(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;
+void obs_phi2::prePhi2Sus(vector< vector <double> > *allVals, vector <double> *preCalculated, void *para) {
+  preCalculated->push_back(0);
+  preCalculated->push_back(0);
+
+  for(vector< vector<double> >::iterator valIt = allVals->begin(); valIt != allVals->end(); ++valIt) {
+    (*preCalculated)[0] += (*valIt)[0];
+    (*preCalculated)[1] += pow((*valIt)[0],2);
+  }
+}
+
+double obs_phi2::phi2Sus(vector <double> *preCalculated, vector<double> *excludedMeas, int nmeas, void *para) {
+  return (( (*preCalculated)[1] - pow((*excludedMeas)[0], 2) )
+	  - pow( (*preCalculated)[0] - (*excludedMeas)[0], 2 ))
+    * *(int*)para
+    / (nmeas-1);
 }
 
 #endif