STEER/AliTrackResidualsFast.h

   1 #ifndef ALITRACKRESIDUALSFAST_H
   2 #define ALITRACKRESIDUALSFAST_H
   3
   4 //************************************************************************
   5 // AliTrackResidualsFast: 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 "TMatrixDSym.h"
  14 #include "TMatrixD.h"
  15
  16 #include "AliAlignObj.h"
  17 #include "AliTrackResiduals.h"
  18
  19 class AliTrackResidualsFast : public AliTrackResiduals {
  20
  21  public:
  22   AliTrackResidualsFast();
  23   AliTrackResidualsFast(Int_t ntracks);
  24   AliTrackResidualsFast(const AliTrackResidualsFast &res);
  25   AliTrackResidualsFast& operator= (const AliTrackResidualsFast& res);
  26   virtual ~AliTrackResidualsFast() { }
  27
  28   Bool_t Minimize();
  29
  30  protected:
  31
  32   void   AddPoints(AliTrackPoint &p, AliTrackPoint &pprime);
  33   Bool_t Update();
  34
  35   Double_t fSum[27]; // Sums used during the chi2 minimization
  36   Double_t fSumR;    // Sum of r squared
  37
  38   ClassDef(AliTrackResidualsFast,1)
  39
  40 };
  41
  42 #endif