1 #ifndef ALITRACKRESIDUALSLINEAR_H
2 #define ALITRACKRESIDUALSLINEAR_H
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. *
11 //************************************************************************
13 #include "AliAlignObj.h"
14 #include "AliTrackResiduals.h"
17 class AliTrackResidualsLinear : public AliTrackResiduals {
20 AliTrackResidualsLinear();
21 AliTrackResidualsLinear(Int_t ntracks);
22 AliTrackResidualsLinear(const AliTrackResidualsLinear &res);
23 AliTrackResidualsLinear& operator= (const AliTrackResidualsLinear& res);
24 virtual ~AliTrackResidualsLinear();
26 void SetRobust(Float_t fraction){fFraction=fraction;}
27 void FixParameter(Int_t par, Float_t value) {fBFixed[par]=kTRUE; fFixed[par]= value;}
28 const Double_t * GetParameters() const { return fParams;}
29 const Double_t * GetCovariance() const { return fCovar;}
30 void ReleaseParameter(Int_t par) {fBFixed[par]=kFALSE;}
33 void AddPoints(AliTrackPoint &p, AliTrackPoint &pprime);
34 TLinearFitter *fFitter; // !Linear fitter
35 Float_t fFraction; // fraction of points for robust fitter if less 0 - no robust fitter invoked
36 Double_t fParams[6]; // resulting parameters
37 Double_t fCovar[36]; // covariance matrix
38 Float_t fFixed[6]; // the fixed values of parameters
39 Float_t fBFixed[6]; // the flag for fixing parameter
40 Double_t fChi2Orig; // original chi2
41 ClassDef(AliTrackResidualsLinear,1)