CbmKFMath.h

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/** Collection of mathematical routines for the CbmKF Kalman Filter
 *
 * @author  S.Gorbunov
 * @version 0.0
 * @since   02.12.05
 *
 * Description will be here
 *
 */
 
#ifndef CBMKFMATH_H
#define CBMKFMATH_H 1
 
#include "TObject.h"
 
class FairField;
class FairTrackParam;
 
class CbmKFMath : public TObject
{
  public:
    CbmKFMath() {}
    ~CbmKFMath() {}
 
    static Bool_t GetThickness(Double_t z1,
                               Double_t z2,
                               Double_t mz,
                               Double_t mthick,
                               Double_t* mz_out,
                               Double_t* mthick_out);
 
    static Bool_t intersectCone(Double_t zCone,
                                Double_t ZCone,
                                Double_t rCone,
                                Double_t RCone,
                                const Double_t x[],
                                Double_t* z1,
                                Double_t* z2);
 
    static Int_t indexS(Int_t i, Int_t j) { return (j <= i) ? i * (i + 1) / 2 + j : j * (j + 1) / 2 + i; }
 
    static void multQSQt(Int_t N, const Double_t Q[], const Double_t S[], Double_t S_out[]);
    static void multQtSQ(Int_t N, const Double_t Q[], const Double_t S[], Double_t S_out[]);
    static void multSSQ(const Double_t* A, const Double_t* B, Double_t* C, Int_t n);
    static void four_dim_inv(Double_t a[4][4]);
    static void five_dim_inv(Double_t a[5][5]);
    static Bool_t invS(Double_t A[], Int_t N);
    static Double_t getDeviation(Double_t x, Double_t y, Double_t C[], Double_t vx, Double_t vy, Double_t Cv[] = 0);
    static Double_t AnalyticQP(const Double_t T[],        // track parameters (x,y,tx,ty,Q/p,z)
                               const Double_t V[],        // vertex parameters (x,y,z)
                               FairField* MagneticField   // magnetic field
    );
 
    static Int_t GetNoise(Double_t Lrl,
                          Double_t F,
                          Double_t Fe,
                          Double_t tx,
                          Double_t ty,
                          Double_t qp,
                          Double_t mass,
                          Bool_t is_electron,
                          Bool_t downstream_direction,
                          Double_t* Q5,
                          Double_t* Q8,
                          Double_t* Q9,
                          Double_t* Ecor);
 
    static void CopyTrackParam2TC(FairTrackParam* par, Double_t T[], Double_t C[]);
    static void CopyTC2TrackParam(FairTrackParam* par, Double_t T[], Double_t C[]);
 
    ClassDef(CbmKFMath, 1)
};
 
#endif /* ! CBMKFMATH_H */