CorrelatedData.h

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#ifndef ATLFAST_CORRELATEDDATA_H
#define ATLFAST_CORRELATEDDATA_H

#include "CLHEP/Random/JamesRandom.h"
#include "CLHEP/Matrix/Matrix.h"
#include <vector>
#include <utility>

namespace Atlfast{
  using std::vector;
  using std::pair;
  using ::HepMatrix;

  class CorrelatedData{
  public:

    CorrelatedData(int);
    ~CorrelatedData() {delete m_randomEngine;}

    vector<double> generate(const HepMatrix& matrix) const;
    double generate(double) const;

    HepMatrix root(const HepMatrix& matrix)const;
    
    
  private:
    pair<double,double> m_ellipse;
    pair<double,double> m_stFactors;
    pair<double,double> m_abFactors;
    HepRandomEngine*    m_randomEngine;
    
    vector<double> normal(int nDev)const;
    bool makeDeviate(pair<double,double> randoms, 
                     double& deviate)const;
    
  };
  
}//end of namespace

#endif

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