PDFWeightsHelper.h

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#ifndef PhysicsTools_HepMCCandAlgos_PDFWeightsHelper_h
#define PhysicsTools_HepMCCandAlgos_PDFWeightsHelper_h
 
#include <Eigen/Dense>
 
#include <iostream>
 
#include "FWCore/ParameterSet/interface/FileInPath.h"
 
class PDFWeightsHelper {
public:
  PDFWeightsHelper();
 
  void Init(unsigned int nreplicas, unsigned int neigenvectors, const edm::FileInPath &incsv);
  void DoMC2Hessian(double nomweight, const double *inweights, double *outweights) const;
 
  unsigned int neigenvectors() const { return transformation_.cols(); }
 
protected:
  Eigen::MatrixXd transformation_;
};
#endif