STEER/AliTrackResidualsLinear.h

   1 #ifndef ALITRACKRESIDUALSLINEAR_H
   2 #define ALITRACKRESIDUALSLINEAR_H
   3
   4 //************************************************************************
   5 // AliTrackResidualsLinear: derived class (from AliTrackResiduals) which   *
   6 // implements a simple linear minimization of the track residuals chi2.  *
   7 // The minimization relies on the fact that the alignment parameters     *
   8 // (angles and translations) are small.                                  *
   9 //                                                                       *
  10 //                                                                       *
  11 //************************************************************************
  12
  13 #include "AliAlignObj.h"
  14 #include "AliTrackResiduals.h"
  15 class TLinearFitter;
  16
  17 class AliTrackResidualsLinear : public AliTrackResiduals {
  18
  19  public:
  20   AliTrackResidualsLinear();
  21   AliTrackResidualsLinear(Int_t ntracks);
  22   AliTrackResidualsLinear(const AliTrackResidualsLinear &res);
  23   AliTrackResidualsLinear& operator= (const AliTrackResidualsLinear& res);
  24   virtual ~AliTrackResidualsLinear();
  25   Bool_t Minimize();
  26   void   SetRobust(Float_t fraction){fFraction=fraction;}
  27   const Double_t * GetParameters() const { return fParams;}
  28   const Double_t * GetCovariance() const { return fCovar;}
  29  protected:
  30   Bool_t Update();
  31   void   AddPoints(AliTrackPoint &p, AliTrackPoint &pprime);
  32   TLinearFitter *fFitter;           // !Linear fitter
  33   Float_t fFraction;                // fraction of points for robust fitter if less 0 - no robust fitter invoked
  34   Double_t fParams[6];               // resulting parameters
  35   Double_t fCovar[36];               // covariance matrix
  36   Double_t fChi2Orig;               // original chi2
  37   ClassDef(AliTrackResidualsLinear,1)
  38
  39 };
  40
  41 #endif