1 /**************************************************************************
2 * Copyright(c) 2001-2002, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 Revision 1.1.8.1 2002/10/15 12:52:42 hristov
19 Changes and bug fixes for the next round of PPR
21 Revision 1.1 2002/05/08 18:19:50 kowal2
22 New class by Andrea Dainese. It deals with the parameters used by
23 AliTPCtrackerParam (efficiences, pulls etc)
27 ////////////////////////////////////////////////////////////////////////
28 // Class used by TPC tracking parameterization to handle to tracking
29 // parameters (efficiencies, etc...) on a kinematic grid [pt,eta].
30 // User has to provide the grid steps and the values of the parameter
31 // in the points of the grid. The function GetValueAt(pt,eta) returns
32 // the result of a linear interpolation at the point [pt,eta].
34 // Origin: Andrea Dainese, Padova - e-mail: andrea.dainese@pd.infn.it
35 ////////////////////////////////////////////////////////////////////////
37 //-- standard headers -----
38 #include "Riostream.h"
39 //--- Root headers --------
42 //-- AliRoot headers ------
43 #include "AliTPCkineGrid.h"
44 //-------------------------
46 ClassImp(AliTPCkineGrid)
48 //------------------------------------------------------------------------
49 AliTPCkineGrid::AliTPCkineGrid() {
50 //------------------------------------------------------------------------
51 // Default constructor
52 //------------------------------------------------------------------------
59 //------------------------------------------------------------------------
60 AliTPCkineGrid::AliTPCkineGrid(Int_t npt,Int_t neta,
61 Double_t* pt,Double_t* eta) {
62 //------------------------------------------------------------------------
63 // Standard constructor
64 //------------------------------------------------------------------------
68 fPt = new TArrayD(fNpt);
69 fEta = new TArrayD(fNeta);
71 for(Int_t i=0; i<npt; i++) (*fPt)[i] = pt[i];
72 for(Int_t i=0; i<neta; i++) (*fEta)[i] = eta[i];
74 fParams = new TMatrixD(fNpt,fNeta);
76 //-------------------------------------------------------------------------
77 AliTPCkineGrid::AliTPCkineGrid(const AliTPCkineGrid& grid) {
78 //-------------------------------------------------------------------------
80 //-------------------------------------------------------------------------
83 fPt = new TArrayD(fNpt);
84 for(Int_t i=0; i<fNpt; i++) (*fPt)[i] = grid.fPt->At(i);
85 fEta = new TArrayD(fNeta);
86 for(Int_t i=0; i<fNeta; i++) (*fEta)[i] = grid.fEta->At(i);
88 fParams = new TMatrixD(fNpt,fNeta);
89 for(Int_t i=0; i<fNpt; i++) {
90 for(Int_t j=0; j<fNeta; j++) (*fParams)(i,j)=(*grid.fParams)(i,j);
93 //--------------------------------------------------------------------------
94 AliTPCkineGrid::~AliTPCkineGrid() {
95 //--------------------------------------------------------------------------
97 //--------------------------------------------------------------------------
102 //--------------------------------------------------------------------------
103 void AliTPCkineGrid::GetArrayEta(Double_t* eta) const {
104 //--------------------------------------------------------------------------
105 // This functions returns an array with the eta points
106 //--------------------------------------------------------------------------
107 for(Int_t i=0;i<fNeta;i++) eta[i] = fEta->At(i);
110 //--------------------------------------------------------------------------
111 void AliTPCkineGrid::GetArrayPt(Double_t* pt) const {
112 //--------------------------------------------------------------------------
113 // This functions returns an array with the pt points
114 //--------------------------------------------------------------------------
115 for(Int_t i=0;i<fNpt;i++) pt[i] = fPt->At(i);
118 //--------------------------------------------------------------------------
119 Int_t AliTPCkineGrid::GetBin(Double_t pt,Double_t eta) const {
120 //--------------------------------------------------------------------------
121 // This functions tells in which bin of the grid a certain point falls
122 //--------------------------------------------------------------------------
124 Int_t etaBin=0,ptBin=0,bin=0;
125 eta = TMath::Abs(eta);
127 /* this is how bins are numbered
140 if(eta < fEta->At(0)) {
142 } else if(eta > fEta->At(fNeta-1)) {
145 for(Int_t i=0; i<fNeta; i++) {
146 if(eta < fEta->At(i)) {
152 if(pt < fPt->At(0)) {
154 } else if(pt > fPt->At(fNpt-1)) {
157 for(Int_t i=0; i<fNpt; i++) {
158 if(pt < fPt->At(i)) {
165 bin = ptBin*(fNeta+1) + etaBin;
169 //--------------------------------------------------------------------------
170 Double_t AliTPCkineGrid::GetParam(Int_t i) const {
171 //--------------------------------------------------------------------------
172 // This functions allows to get parameters using only one index
173 //--------------------------------------------------------------------------
174 Int_t ipt = (Int_t)i/fNeta;
175 Int_t ieta = i-ipt*fNeta;
176 return GetParam(ipt,ieta);
178 //--------------------------------------------------------------------------
179 Double_t AliTPCkineGrid::GetValueAt(Double_t pt,Double_t eta) const {
180 //--------------------------------------------------------------------------
181 // This functions makes a linear interpolation at the point [pt,eta]
182 //--------------------------------------------------------------------------
184 // determine the points to be used in the interpolation:
187 eta = TMath::Abs(eta);
188 Int_t etaLow=0,etaUp=0;
189 if(eta < fEta->At(0)) {
192 } else if(eta >= fEta->At(fNeta-1)) {
196 for(Int_t i=0; i<fNeta; i++) {
197 if(eta < fEta->At(i)) {
206 Int_t ptLow=0,ptUp=0;
207 if(pt < fPt->At(0)) {
210 } else if(pt >= fPt->At(fNpt-1)) {
214 for(Int_t i=0; i<fNpt; i++) {
215 if(pt < fPt->At(i)) {
223 //cerr<<" Pt = ("<<ptLow<<","<<ptUp<<") Eta = ("<<etaLow<<","<<etaUp<<")\n";
225 Double_t intValue=0,intValueEtaLow=0,intValueEtaUp=0;
226 // interpolate, at etaLow, between ptLow and ptUp
227 intValueEtaLow = (*fParams)(ptLow,etaLow)+
228 ((*fParams)(ptUp,etaLow)-(*fParams)(ptLow,etaLow))/
229 (fPt->At(ptUp)-fPt->At(ptLow))*(pt-fPt->At(ptLow));
230 // interpolate, at etaUp, between ptLow and ptUp
231 intValueEtaUp = (*fParams)(ptLow,etaUp)+
232 ((*fParams)(ptUp,etaUp)-(*fParams)(ptLow,etaUp))/
233 (fPt->At(ptUp)-fPt->At(ptLow))*(pt-fPt->At(ptLow));
234 // interpolate, at pt, between etaLow and etaUp
235 intValue = intValueEtaLow+
236 (intValueEtaUp-intValueEtaLow)/
237 (fEta->At(etaUp)-fEta->At(etaLow))*(eta-fEta->At(etaLow));
239 if(intValue<0.) intValue=0.;
242 //--------------------------------------------------------------------------
243 void AliTPCkineGrid::SetParam(Int_t i,Double_t par) {
244 //--------------------------------------------------------------------------
245 // This functions allows to set parameters using only one index
246 //--------------------------------------------------------------------------
247 Int_t ipt = (Int_t)i/fNeta;
248 Int_t ieta = i-ipt*fNeta;
249 SetParam(ipt,ieta,par);