EgammaBDTOutputTransformer.h

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#ifndef RecoEgamma_ElectronTools_EgammaBDTOutputTransformer_h
#define RecoEgamma_ElectronTools_EgammaBDTOutputTransformer_h

//author: Sam Harper (RAL)
//description:
//  translates the raw value returned by the BDT output to the true value
//  apparently its MINUIT-like, orginally taken from E/gamma regression applicator

#include <vdt/vdtMath.h>

class EgammaBDTOutputTransformer {
public:
  EgammaBDTOutputTransformer(const double limitLow, const double limitHigh)
      : offset_(limitLow + 0.5 * (limitHigh - limitLow)), scale_(0.5 * (limitHigh - limitLow)) {}

  double operator()(const double rawVal) const { return offset_ + scale_ * vdt::fast_sin(rawVal); }

private:
  const double offset_;
  const double scale_;
};

#endif