* provided "as is" without express or implied warranty. *
**************************************************************************/
+/* $Id$ */
+
//-----------------------------------------------------------------
// Implementation of the TPC track class
-//
-// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
+// This class is used by the AliTPCtracker class
+// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
//-----------------------------------------------------------------
-#include <iostream.h>
+#include <Riostream.h>
-#include "AliCluster.h"
#include "AliTPCtrack.h"
-#include "AliTPCcluster.h"
-#include "AliTPCClustersRow.h"
-#include "AliTPCClustersArray.h"
+#include "AliCluster.h"
+#include "AliBarrelTrack.h"
+#include "AliESDtrack.h"
ClassImp(AliTPCtrack)
+
+//_________________________________________________________________________
+AliTPCtrack::AliTPCtrack(): AliKalmanTrack()
+{
+ fX = fP0 = fP1 = fP2 = fP3 = fP3 = fP4 = 0.0;
+ fAlpha = fdEdx = 0.0;
+ fNWrong = fNRotation = fNumber = 0; // [SR, 01.04.2003]
+}
+
//_________________________________________________________________________
AliTPCtrack::AliTPCtrack(UInt_t index, const Double_t xx[5],
const Double_t cc[15], Double_t xref, Double_t alpha) : AliKalmanTrack() {
fIndex[0]=index;
SetNumberOfClusters(1);
+
+}
+
+//_____________________________________________________________________________
+AliTPCtrack::AliTPCtrack(const AliKalmanTrack& t,Double_t alpha) :
+AliKalmanTrack(t) {
+ //-----------------------------------------------------------------
+ // Conversion AliKalmanTrack -> AliTPCtrack.
+ //-----------------------------------------------------------------
+ SetChi2(0.);
+ SetNumberOfClusters(0);
+
+ fdEdx = 0.;
+ fAlpha = alpha;
+ if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
+ else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
+
+ //Conversion of the track parameters
+ Double_t x,p[5]; t.GetExternalParameters(x,p);
+ fX=x; x=GetConvConst();
+ fP0=p[0];
+ fP1=p[1];
+ fP3=p[3];
+ fP4=p[4]/x;
+ fP2=fP4*fX - p[2];
+
+ //Conversion of the covariance matrix
+ Double_t c[15]; t.GetExternalCovariance(c);
+ c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x;
+
+ Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5];
+ Double_t c32=fX*c[13] - c[8];
+ Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12];
+
+ fC00=c[0 ];
+ fC10=c[1 ]; fC11=c[2 ];
+ fC20=c20; fC21=c21; fC22=c22;
+ fC30=c[6 ]; fC31=c[7 ]; fC32=c32; fC33=c[9 ];
+ fC40=c[10]; fC41=c[11]; fC42=c42; fC43=c[13]; fC44=c[14];
+
+}
+
+//_____________________________________________________________________________
+AliTPCtrack::AliTPCtrack(const AliESDtrack& t) : AliKalmanTrack() {
+ //-----------------------------------------------------------------
+ // Conversion AliESDtrack -> AliTPCtrack.
+ //-----------------------------------------------------------------
+ SetNumberOfClusters(t.GetTPCclusters(fIndex));
+ SetLabel(t.GetLabel());
+ SetMass(t.GetMass());
+
+ fdEdx = t.GetTPCsignal();
+ fAlpha = t.GetAlpha();
+ if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
+ else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
+
+ //Conversion of the track parameters
+ Double_t x,p[5]; t.GetExternalParameters(x,p);
+ fX=x; x=GetConvConst();
+ fP0=p[0];
+ fP1=p[1];
+ fP3=p[3];
+ fP4=p[4]/x;
+ fP2=fP4*fX - p[2];
+
+ //Conversion of the covariance matrix
+ Double_t c[15]; t.GetExternalCovariance(c);
+ c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x;
+
+ Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5];
+ Double_t c32=fX*c[13] - c[8];
+ Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12];
+
+ fC00=c[0 ];
+ fC10=c[1 ]; fC11=c[2 ];
+ fC20=c20; fC21=c21; fC22=c22;
+ fC30=c[6 ]; fC31=c[7 ]; fC32=c32; fC33=c[9 ];
+ fC40=c[10]; fC41=c[11]; fC42=c42; fC43=c[13]; fC44=c[14];
+
+ if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
+ StartTimeIntegral();
+ Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
+ SetIntegratedLength(t.GetIntegratedLength());
}
//_____________________________________________________________________________
Int_t n=GetNumberOfClusters();
for (Int_t i=0; i<n; i++) fIndex[i]=t.fIndex[i];
}
+//_____________________________________________________________________________
+
+void AliTPCtrack::GetBarrelTrack(AliBarrelTrack *track) {
+ //
+ // Create a Barrel Track out of this track
+ // Current track is propagated to the reference plane
+ // by the tracker
+ //
+ // [SR, 01.04.2003]
+
+ if (!track) return;
+ Double_t xr, vec[5], cov[15];
+ track->SetLabel(GetLabel());
+ track->SetX(fX, fAlpha);
+ track->SetNClusters(GetNumberOfClusters(), GetChi2());
+ Double_t times[10];
+ GetIntegratedTimes(times);
+ track->SetTime(times, GetIntegratedLength());
+
+ track->SetMass(GetMass());
+ track->SetdEdX(GetdEdx());
+
+ track->SetNWrongClusters(fNWrong);
+ track->SetNRotate(fNRotation);
+
+ GetExternalParameters(xr, vec);
+ track->SetStateVector(vec);
+
+ GetExternalCovariance(cov);
+ track->SetCovarianceMatrix(cov);
+
+}
//_____________________________________________________________________________
Int_t AliTPCtrack::Compare(const TObject *o) const {
//-----------------------------------------------------------------
// This function compares tracks according to the their curvature
//-----------------------------------------------------------------
AliTPCtrack *t=(AliTPCtrack*)o;
- Double_t co=TMath::Abs(t->Get1Pt());
- Double_t c =TMath::Abs(Get1Pt());
+ //Double_t co=TMath::Abs(t->Get1Pt());
+ //Double_t c =TMath::Abs(Get1Pt());
+ Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
+ Double_t c =GetSigmaY2()*GetSigmaZ2();
if (c>co) return 1;
else if (c<co) return -1;
return 0;
// This function returns an external representation of the covriance matrix.
// (See comments in AliTPCtrack.h about external track representation)
//-------------------------------------------------------------------------
- Double_t a=kConversionConstant;
+ Double_t a=GetConvConst();
- Double_t c22=fX*fX*fC33-2*fX*fC32+fC22;
- Double_t c42=fX*fC43-fC42;
- Double_t c20=fX*fC30-fC20, c21=fX*fC31-fC21, c32=fX*fC33-fC32;
+ Double_t c22=fX*fX*fC44-2*fX*fC42+fC22;
+ Double_t c32=fX*fC43-fC32;
+ Double_t c20=fX*fC40-fC20, c21=fX*fC41-fC21, c42=fX*fC44-fC42;
cc[0 ]=fC00;
cc[1 ]=fC10; cc[2 ]=fC11;
cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22;
- cc[6 ]=fC40; cc[7 ]=fC41; cc[8 ]=c42; cc[9 ]=fC44;
- cc[10]=fC30*a; cc[11]=fC31*a; cc[12]=c32*a; cc[13]=fC43*a; cc[14]=fC33*a*a;
+ cc[6 ]=fC30; cc[7 ]=fC31; cc[8 ]=c32; cc[9 ]=fC33;
+ cc[10]=fC40*a; cc[11]=fC41*a; cc[12]=c42*a; cc[13]=fC43*a; cc[14]=fC44*a*a;
}
return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det;
}
+Double_t AliTPCtrack::GetYat(Double_t xk) const {
+//-----------------------------------------------------------------
+// This function calculates the Y-coordinate of a track at the plane x=xk.
+//-----------------------------------------------------------------
+ Double_t c1=fP4*fX - fP2, r1=TMath::Sqrt(1.- c1*c1);
+ Double_t c2=fP4*xk - fP2, r2=TMath::Sqrt(1.- c2*c2);
+ return fP0 + (xk-fX)*(c1+c2)/(r1+r2);
+}
+
//_____________________________________________________________________________
-Int_t AliTPCtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho,Double_t pm)
-{
+Int_t AliTPCtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho) {
//-----------------------------------------------------------------
// This function propagates a track to a reference plane x=xk.
//-----------------------------------------------------------------
- if (TMath::Abs(fP3*xk - fP2) >= 0.99999) {
- Int_t n=GetNumberOfClusters();
- if (n>4) cerr<<n<<" AliTPCtrack warning: Propagation failed !\n";
+ if (TMath::Abs(fP4*xk - fP2) >= 0.9) {
+ // Int_t n=GetNumberOfClusters();
+ //if (n>4) cerr<<n<<" AliTPCtrack warning: Propagation failed !\n";
return 0;
}
+
+ // old position for time [SR, GSI 17.02.2003]
+ Double_t oldX = fX;
+ Double_t oldY = fP0;
+ Double_t oldZ = fP1;
+ //
Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fP0, z1=fP1;
- Double_t c1=fP3*x1 - fP2, r1=sqrt(1.- c1*c1);
- Double_t c2=fP3*x2 - fP2, r2=sqrt(1.- c2*c2);
+ Double_t c1=fP4*x1 - fP2, r1=sqrt(1.- c1*c1);
+ Double_t c2=fP4*x2 - fP2, r2=sqrt(1.- c2*c2);
fP0 += dx*(c1+c2)/(r1+r2);
- fP1 += dx*(c1+c2)/(c1*r2 + c2*r1)*fP4;
+ fP1 += dx*(c1+c2)/(c1*r2 + c2*r1)*fP3;
//f = F - 1
Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2;
Double_t f02=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
- Double_t f03= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
+ Double_t f04= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
Double_t cr=c1*r2+c2*r1;
- Double_t f12=-dx*fP4*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
- Double_t f13=dx*fP4*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
- Double_t f14= dx*cc/cr;
+ Double_t f12=-dx*fP3*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
+ Double_t f13= dx*cc/cr;
+ Double_t f14=dx*fP3*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
//b = C*ft
- Double_t b00=f02*fC20 + f03*fC30, b01=f12*fC20 + f13*fC30 + f14*fC40;
- Double_t b10=f02*fC21 + f03*fC31, b11=f12*fC21 + f13*fC31 + f14*fC41;
- Double_t b20=f02*fC22 + f03*fC32, b21=f12*fC22 + f13*fC32 + f14*fC42;
- Double_t b30=f02*fC32 + f03*fC33, b31=f12*fC32 + f13*fC33 + f14*fC43;
- Double_t b40=f02*fC42 + f03*fC43, b41=f12*fC42 + f13*fC43 + f14*fC44;
+ Double_t b00=f02*fC20 + f04*fC40, b01=f12*fC20 + f14*fC40 + f13*fC30;
+ Double_t b10=f02*fC21 + f04*fC41, b11=f12*fC21 + f14*fC41 + f13*fC31;
+ Double_t b20=f02*fC22 + f04*fC42, b21=f12*fC22 + f14*fC42 + f13*fC32;
+ Double_t b30=f02*fC32 + f04*fC43, b31=f12*fC32 + f14*fC43 + f13*fC33;
+ Double_t b40=f02*fC42 + f04*fC44, b41=f12*fC42 + f14*fC44 + f13*fC43;
//a = f*b = f*C*ft
- Double_t a00=f02*b20+f03*b30,a01=f02*b21+f03*b31,a11=f12*b21+f13*b31+f14*b41;
+ Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a11=f12*b21+f14*b41+f13*b31;
//F*C*Ft = C + (a + b + bt)
fC00 += a00 + 2*b00;
//Multiple scattering******************
Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fP0)*(y1-fP0)+(z1-fP1)*(z1-fP1));
Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
- Double_t beta2=p2/(p2 + pm*pm);
- Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
- //Double_t theta2=1.0259e-6*10*10/20/(beta2*p2)*d*rho;
+ Double_t beta2=p2/(p2 + GetMass()*GetMass());
+ //Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
+ Double_t theta2=1.0259e-6*10*10/20/(beta2*p2)*d*rho;
- Double_t ey=fP3*fX - fP2, ez=fP4;
- Double_t xz=fP3*ez, zz1=ez*ez+1, xy=fP2+ey;
+ Double_t ey=fP4*fX - fP2, ez=fP3;
+ Double_t xz=fP4*ez, zz1=ez*ez+1, xy=fP2+ey;
- fC33 += xz*xz*theta2;
- fC32 += xz*ez*xy*theta2;
- fC43 += xz*zz1*theta2;
fC22 += (2*ey*ez*ez*fP2+1-ey*ey+ez*ez+fP2*fP2*ez*ez)*theta2;
- fC42 += ez*zz1*xy*theta2;
- fC44 += zz1*zz1*theta2;
+ fC32 += ez*zz1*xy*theta2;
+ fC33 += zz1*zz1*theta2;
+ fC42 += xz*ez*xy*theta2;
+ fC43 += xz*zz1*theta2;
+ fC44 += xz*xz*theta2;
//Energy losses************************
Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d*rho;
if (x1 < x2) dE=-dE;
- cc=fP3;
- fP3*=(1.- sqrt(p2+pm*pm)/p2*dE);
- fP2+=fX*(fP3-cc);
+ cc=fP4;
+ fP4*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE);
+ fP2+=fX*(fP4-cc);
+
+ // Integrated Time [SR, GSI, 17.02.2003]
+ if (IsStartedTimeIntegral()) {
+ Double_t l2 = (fX-oldX)*(fX-oldX)+(fP0-oldY)*(fP0-oldY)+(fP1-oldZ)*(fP1-oldZ);
+ AddTimeStep(TMath::Sqrt(l2));
+ }
+ //
return 1;
}
//_____________________________________________________________________________
-Int_t AliTPCtrack::PropagateToVertex(Double_t x0,Double_t rho,Double_t pm)
+Int_t AliTPCtrack::PropagateToVertex(Double_t x0,Double_t rho)
{
//-----------------------------------------------------------------
// This function propagates tracks to the "vertex".
//-----------------------------------------------------------------
- Double_t c=fP3*fX - fP2;
- Double_t tgf=-fP2/(fP3*fP0 + sqrt(1-c*c));
+ Double_t c=fP4*fX - fP2;
+ Double_t tgf=-fP2/(fP4*fP0 + sqrt(1-c*c));
Double_t snf=tgf/sqrt(1.+ tgf*tgf);
- Double_t xv=(fP2+snf)/fP3;
- return PropagateTo(xv,x0,rho,pm);
+ Double_t xv=(fP2+snf)/fP4;
+ return PropagateTo(xv,x0,rho);
}
//_____________________________________________________________________________
//-----------------------------------------------------------------
// This function associates a cluster with this track.
//-----------------------------------------------------------------
+
+ // update the number of wrong SR[20.03.2003]
+ Int_t absLabel = TMath::Abs(GetLabel());
+ if ( (c->GetLabel(0) != absLabel) &&
+ (c->GetLabel(0) != absLabel) &&
+ (c->GetLabel(0) != absLabel)) fNWrong++;
+ //
+
Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2();
r00+=fC00; r01+=fC10; r11+=fC11;
Double_t det=r00*r11 - r01*r01;
Double_t k40=fC40*r00+fC41*r01, k41=fC40*r01+fC41*r11;
Double_t dy=c->GetY() - fP0, dz=c->GetZ() - fP1;
- Double_t cur=fP3 + k30*dy + k31*dz, eta=fP2 + k20*dy + k21*dz;
- if (TMath::Abs(cur*fX-eta) >= 0.99999) {
- Int_t n=GetNumberOfClusters();
- if (n>4) cerr<<n<<" AliTPCtrack warning: Filtering failed !\n";
+ Double_t cur=fP4 + k40*dy + k41*dz, eta=fP2 + k20*dy + k21*dz;
+ if (TMath::Abs(cur*fX-eta) >= 0.9) {
+ // Int_t n=GetNumberOfClusters();
+ //if (n>4) cerr<<n<<" AliTPCtrack warning: Filtering failed !\n";
return 0;
}
fP0 += k00*dy + k01*dz;
fP1 += k10*dy + k11*dz;
fP2 = eta;
- fP3 = cur;
- fP4 += k40*dy + k41*dz;
+ fP3 += k30*dy + k31*dz;
+ fP4 = cur;
Double_t c01=fC10, c02=fC20, c03=fC30, c04=fC40;
Double_t c12=fC21, c13=fC31, c14=fC41;
fC42-=k20*c04+k21*c14;
fC33-=k30*c03+k31*c13;
- fC43-=k30*c04+k31*c14;
+ fC43-=k40*c03+k41*c13;
fC44-=k40*c04+k41*c14;
//-----------------------------------------------------------------
// This function rotates this track.
//-----------------------------------------------------------------
+
+ if (alpha != 0) fNRotation++; // [SR, 01.04.2003]
+
fAlpha += alpha;
if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi();
if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi();
Double_t x1=fX, y1=fP0;
Double_t ca=cos(alpha), sa=sin(alpha);
- Double_t r1=fP3*fX - fP2;
+ Double_t r1=fP4*fX - fP2;
fX = x1*ca + y1*sa;
fP0=-x1*sa + y1*ca;
- fP2=fP2*ca + (fP3*y1 + sqrt(1.- r1*r1))*sa;
+ fP2=fP2*ca + (fP4*y1 + sqrt(1.- r1*r1))*sa;
- Double_t r2=fP3*fX - fP2;
+ Double_t r2=fP4*fX - fP2;
if (TMath::Abs(r2) >= 0.99999) {
Int_t n=GetNumberOfClusters();
if (n>4) cerr<<n<<" AliTPCtrack warning: Rotation failed !\n";
return 0;
}
- Double_t y0=fP0 + sqrt(1.- r2*r2)/fP3;
- if ((fP0-y0)*fP3 >= 0.) {
+ Double_t y0=fP0 + sqrt(1.- r2*r2)/fP4;
+ if ((fP0-y0)*fP4 >= 0.) {
Int_t n=GetNumberOfClusters();
if (n>4) cerr<<n<<" AliTPCtrack warning: Rotation failed !!!\n";
return 0;
}
//f = F - 1
- Double_t f00=ca-1, f23=(y1 - r1*x1/sqrt(1.- r1*r1))*sa,
- f20=fP3*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1;
+ Double_t f00=ca-1, f24=(y1 - r1*x1/sqrt(1.- r1*r1))*sa,
+ f20=fP4*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1;
//b = C*ft
- Double_t b00=fC00*f00, b02=fC00*f20+fC30*f23+fC20*f22;
- Double_t b10=fC10*f00, b12=fC10*f20+fC31*f23+fC21*f22;
- Double_t b20=fC20*f00, b22=fC20*f20+fC32*f23+fC22*f22;
- Double_t b30=fC30*f00, b32=fC30*f20+fC33*f23+fC32*f22;
- Double_t b40=fC40*f00, b42=fC40*f20+fC43*f23+fC42*f22;
+ Double_t b00=fC00*f00, b02=fC00*f20+fC40*f24+fC20*f22;
+ Double_t b10=fC10*f00, b12=fC10*f20+fC41*f24+fC21*f22;
+ Double_t b20=fC20*f00, b22=fC20*f20+fC42*f24+fC22*f22;
+ Double_t b30=fC30*f00, b32=fC30*f20+fC43*f24+fC32*f22;
+ Double_t b40=fC40*f00, b42=fC40*f20+fC44*f24+fC42*f22;
//a = f*b = f*C*ft
- Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f23*b32+f22*b22;
+ Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f24*b42+f22*b22;
// *** Double_t dy2=fCyy;
return 1;
}
-//_____________________________________________________________________________
-void AliTPCtrack::CookLabel(AliTPCClustersArray *ca) {
- //-----------------------------------------------------------------
- // This function cooks the track label. If label<0, this track is fake.
- //-----------------------------------------------------------------
- Int_t n=GetNumberOfClusters();
- Int_t *lb=new Int_t[n];
- Int_t *mx=new Int_t[n];
- AliTPCcluster **clusters=new AliTPCcluster*[n];
-
- Int_t i;
- Int_t sec,row,ncl;
- for (i=0; i<n; i++) {
- lb[i]=mx[i]=0;
- GetCluster(i,sec,row,ncl);
- AliTPCClustersRow *clrow=ca->GetRow(sec,row);
- clusters[i]=(AliTPCcluster*)(*clrow)[ncl];
- }
-
- Int_t lab=123456789;
- for (i=0; i<n; i++) {
- AliTPCcluster *c=clusters[i];
- lab=TMath::Abs(c->GetLabel(0));
- Int_t j;
- for (j=0; j<n; j++)
- if (lb[j]==lab || mx[j]==0) break;
- lb[j]=lab;
- (mx[j])++;
- }
-
- Int_t max=0;
- for (i=0; i<n; i++)
- if (mx[i]>max) {max=mx[i]; lab=lb[i];}
-
- for (i=0; i<n; i++) {
- AliTPCcluster *c=clusters[i];
- if (TMath::Abs(c->GetLabel(1)) == lab ||
- TMath::Abs(c->GetLabel(2)) == lab ) max++;
- }
-
- SetLabel(-lab);
- if (1.-Float_t(max)/n <= 0.10) {
- //Int_t tail=Int_t(0.08*fN);
- Int_t tail=14;
- max=0;
- for (i=1; i<=tail; i++) {
- AliTPCcluster *c=clusters[n-i];
- if (lab == TMath::Abs(c->GetLabel(0)) ||
- lab == TMath::Abs(c->GetLabel(1)) ||
- lab == TMath::Abs(c->GetLabel(2))) max++;
- }
- if (max >= Int_t(0.5*tail)) SetLabel(lab);
- }
-/*
-if (lab==111)
- for (i=0; i<n; i++) {
- AliTPCcluster *c=clusters[i];
- cerr<<i<<' '<<c->GetLabel(0)<<endl;
- }
-*/
- delete[] lb;
- delete[] mx;
- delete[] clusters;
+void AliTPCtrack::ResetCovariance() {
+ //------------------------------------------------------------------
+ //This function makes a track forget its history :)
+ //------------------------------------------------------------------
+
+ fC00*=10.;
+ fC10=0.; fC11*=10.;
+ fC20=0.; fC21=0.; fC22*=10.;
+ fC30=0.; fC31=0.; fC32=0.; fC33*=10.;
+ fC40=0.; fC41=0.; fC42=0.; fC43=0.; fC44*=10.;
+
+}
+
+////////////////////////////////////////////////////////////////////////
+Double_t AliTPCtrack::Phi() const {
+//
+//
+//
+ Double_t phi = TMath::ASin(GetSnp()) + fAlpha;
+ if (phi<0) phi+=2*TMath::Pi();
+ if (phi>=2*TMath::Pi()) phi-=2*TMath::Pi();
+ return phi;
}
+////////////////////////////////////////////////////////////////////////
+
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff