FourJetPairing.C

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// Class FourJetPairing
//
// Author: Jenny Boehme, Anca Siebel
// Last update: $Date: 2004/06/01 16:40:09 $
//          by: $Author: blist $
// 
// Description: handle permutations of 2b jets and 4 light jets
//               

#include <iostream>
#include "jbltools/kinfit/FourJetPairing.h"
#include "jbltools/kinfit/JetFitObject.h"

FourJetPairing::FourJetPairing (JetFitObject *jets_[])  {
       
  for (int i = 0; i < NJETS; ++i) jets[i] = jets_[i];
  iperm = 0;
   
  // this assumes jet 5 & 6 to be the b-jets !!
 
  int perms[NPERM][NJETS] = {{1, 2, 3, 4}, 
                             {1, 3, 2, 4}, 
                             {1, 4, 2, 3}};
                             
  for (int i = 0; i < NPERM; ++i) 
     for (int j = 0; j < NJETS; ++j) 
                          permutations[i][j] = perms[i][j];    
                                                   
}

int FourJetPairing::nextPermutation (JetFitObject *permObjects[]) {
    
  for (int ijet = 0; ijet < NJETS; ++ijet) {
    permObjects[ijet] = jets[permutations[iperm][ijet]-1];
  } 
  
  ++iperm;
  return iperm;
}

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