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33049b0a | 1 | /************************************************************************** |
2 | * Copyright(c) 2001-2002, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
88cb7938 | 16 | /* $Id$ */ |
33049b0a | 17 | |
18 | //////////////////////////////////////////////////////////////////////// | |
19 | // Class used by TPC tracking parameterization to handle to tracking | |
20 | // parameters (efficiencies, etc...) on a kinematic grid [pt,eta]. | |
21 | // User has to provide the grid steps and the values of the parameter | |
22 | // in the points of the grid. The function GetValueAt(pt,eta) returns | |
23 | // the result of a linear interpolation at the point [pt,eta]. | |
24 | // | |
25 | // Origin: Andrea Dainese, Padova - e-mail: andrea.dainese@pd.infn.it | |
26 | //////////////////////////////////////////////////////////////////////// | |
27 | ||
b2bca9d4 | 28 | //-- standard headers ----- |
29 | #include "Riostream.h" | |
30 | //--- Root headers -------- | |
33049b0a | 31 | #include <TMatrixD.h> |
32 | #include <TArrayD.h> | |
b2bca9d4 | 33 | //-- AliRoot headers ------ |
33049b0a | 34 | #include "AliTPCkineGrid.h" |
b2bca9d4 | 35 | //------------------------- |
33049b0a | 36 | |
37 | ClassImp(AliTPCkineGrid) | |
38 | ||
39 | //------------------------------------------------------------------------ | |
179c6296 | 40 | AliTPCkineGrid::AliTPCkineGrid() |
41 | :TNamed(), | |
42 | fNpt(0), | |
43 | fNeta(0), | |
44 | fPt(0), | |
45 | fEta(0), | |
46 | fParams(0) | |
47 | { | |
33049b0a | 48 | //------------------------------------------------------------------------ |
49 | // Default constructor | |
50 | //------------------------------------------------------------------------ | |
179c6296 | 51 | |
33049b0a | 52 | } |
53 | //------------------------------------------------------------------------ | |
54 | AliTPCkineGrid::AliTPCkineGrid(Int_t npt,Int_t neta, | |
179c6296 | 55 | Double_t* pt,Double_t* eta) |
56 | :TNamed(), | |
57 | fNpt(npt), | |
58 | fNeta(neta), | |
59 | fPt(0), | |
60 | fEta(0), | |
61 | fParams(0) | |
62 | { | |
33049b0a | 63 | //------------------------------------------------------------------------ |
64 | // Standard constructor | |
65 | //------------------------------------------------------------------------ | |
179c6296 | 66 | |
33049b0a | 67 | |
68 | fPt = new TArrayD(fNpt); | |
69 | fEta = new TArrayD(fNeta); | |
70 | ||
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]; | |
73 | ||
74 | fParams = new TMatrixD(fNpt,fNeta); | |
75 | } | |
76 | //------------------------------------------------------------------------- | |
179c6296 | 77 | AliTPCkineGrid::AliTPCkineGrid(const AliTPCkineGrid& grid):TNamed(grid), |
78 | fNpt(0), | |
79 | fNeta(0), | |
80 | fPt(0), | |
81 | fEta(0), | |
82 | fParams(0) | |
83 | { | |
33049b0a | 84 | //------------------------------------------------------------------------- |
85 | // Copy constructor | |
86 | //------------------------------------------------------------------------- | |
87 | fNpt = grid.fNpt; | |
88 | fNeta = grid.fNeta; | |
89 | fPt = new TArrayD(fNpt); | |
90 | for(Int_t i=0; i<fNpt; i++) (*fPt)[i] = grid.fPt->At(i); | |
91 | fEta = new TArrayD(fNeta); | |
92 | for(Int_t i=0; i<fNeta; i++) (*fEta)[i] = grid.fEta->At(i); | |
93 | ||
94 | fParams = new TMatrixD(fNpt,fNeta); | |
95 | for(Int_t i=0; i<fNpt; i++) { | |
96 | for(Int_t j=0; j<fNeta; j++) (*fParams)(i,j)=(*grid.fParams)(i,j); | |
97 | } | |
98 | } | |
99 | //-------------------------------------------------------------------------- | |
100 | AliTPCkineGrid::~AliTPCkineGrid() { | |
101 | //-------------------------------------------------------------------------- | |
102 | // Destructor | |
103 | //-------------------------------------------------------------------------- | |
104 | delete fPt; | |
105 | delete fEta; | |
106 | delete fParams; | |
107 | } | |
179c6296 | 108 | //__________________________________________________________________________ |
109 | AliTPCkineGrid & AliTPCkineGrid::operator =(const AliTPCkineGrid & param) | |
110 | { | |
111 | // | |
112 | // assignment operator - dummy | |
113 | // | |
114 | fNpt=param.fNpt; | |
115 | return (*this); | |
116 | } | |
33049b0a | 117 | //-------------------------------------------------------------------------- |
118 | void AliTPCkineGrid::GetArrayEta(Double_t* eta) const { | |
119 | //-------------------------------------------------------------------------- | |
120 | // This functions returns an array with the eta points | |
121 | //-------------------------------------------------------------------------- | |
122 | for(Int_t i=0;i<fNeta;i++) eta[i] = fEta->At(i); | |
123 | return; | |
124 | } | |
125 | //-------------------------------------------------------------------------- | |
126 | void AliTPCkineGrid::GetArrayPt(Double_t* pt) const { | |
127 | //-------------------------------------------------------------------------- | |
128 | // This functions returns an array with the pt points | |
129 | //-------------------------------------------------------------------------- | |
130 | for(Int_t i=0;i<fNpt;i++) pt[i] = fPt->At(i); | |
131 | return; | |
132 | } | |
133 | //-------------------------------------------------------------------------- | |
134 | Int_t AliTPCkineGrid::GetBin(Double_t pt,Double_t eta) const { | |
135 | //-------------------------------------------------------------------------- | |
136 | // This functions tells in which bin of the grid a certain point falls | |
137 | //-------------------------------------------------------------------------- | |
138 | ||
139 | Int_t etaBin=0,ptBin=0,bin=0; | |
140 | eta = TMath::Abs(eta); | |
141 | ||
142 | /* this is how bins are numbered | |
143 | ||
144 | ... ... . | |
145 | ---+---+--- | |
146 | ^ 6 | 7 | 8 | |
147 | | ---+---+--- | |
148 | 3 | 4 | 5 | |
149 | Pt ---+---+--- | |
150 | 0 | 1 | 2 | |
151 | ||
152 | eta -> | |
153 | */ | |
154 | ||
155 | if(eta < fEta->At(0)) { | |
156 | etaBin = 0; | |
157 | } else if(eta > fEta->At(fNeta-1)) { | |
158 | etaBin = fNeta; | |
159 | } else { | |
160 | for(Int_t i=0; i<fNeta; i++) { | |
161 | if(eta < fEta->At(i)) { | |
162 | etaBin = i; | |
163 | break; | |
164 | } | |
165 | } | |
166 | } | |
167 | if(pt < fPt->At(0)) { | |
168 | ptBin = 0; | |
169 | } else if(pt > fPt->At(fNpt-1)) { | |
170 | ptBin = fNpt; | |
171 | } else { | |
172 | for(Int_t i=0; i<fNpt; i++) { | |
173 | if(pt < fPt->At(i)) { | |
174 | ptBin = i; | |
175 | break; | |
176 | } | |
177 | } | |
178 | } | |
179 | ||
180 | bin = ptBin*(fNeta+1) + etaBin; | |
181 | ||
182 | return bin; | |
183 | } | |
184 | //-------------------------------------------------------------------------- | |
185 | Double_t AliTPCkineGrid::GetParam(Int_t i) const { | |
186 | //-------------------------------------------------------------------------- | |
187 | // This functions allows to get parameters using only one index | |
188 | //-------------------------------------------------------------------------- | |
189 | Int_t ipt = (Int_t)i/fNeta; | |
190 | Int_t ieta = i-ipt*fNeta; | |
191 | return GetParam(ipt,ieta); | |
192 | } | |
193 | //-------------------------------------------------------------------------- | |
194 | Double_t AliTPCkineGrid::GetValueAt(Double_t pt,Double_t eta) const { | |
195 | //-------------------------------------------------------------------------- | |
196 | // This functions makes a linear interpolation at the point [pt,eta] | |
197 | //-------------------------------------------------------------------------- | |
198 | ||
199 | // determine the points to be used in the interpolation: | |
200 | // | |
201 | // eta | |
202 | eta = TMath::Abs(eta); | |
203 | Int_t etaLow=0,etaUp=0; | |
204 | if(eta < fEta->At(0)) { | |
205 | etaLow = 0; | |
206 | etaUp = 1; | |
207 | } else if(eta >= fEta->At(fNeta-1)) { | |
208 | etaLow = fNeta-2; | |
209 | etaUp = fNeta-1; | |
210 | } else { | |
211 | for(Int_t i=0; i<fNeta; i++) { | |
212 | if(eta < fEta->At(i)) { | |
213 | etaLow = i-1; | |
214 | etaUp = i; | |
215 | break; | |
216 | } | |
217 | } | |
218 | } | |
219 | // | |
220 | // pt | |
221 | Int_t ptLow=0,ptUp=0; | |
222 | if(pt < fPt->At(0)) { | |
223 | ptLow = 0; | |
224 | ptUp = 1; | |
225 | } else if(pt >= fPt->At(fNpt-1)) { | |
226 | ptLow = fNpt-2; | |
227 | ptUp = fNpt-1; | |
228 | } else { | |
229 | for(Int_t i=0; i<fNpt; i++) { | |
230 | if(pt < fPt->At(i)) { | |
231 | ptLow = i-1; | |
232 | ptUp = i; | |
233 | break; | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
238 | //cerr<<" Pt = ("<<ptLow<<","<<ptUp<<") Eta = ("<<etaLow<<","<<etaUp<<")\n"; | |
239 | ||
240 | Double_t intValue=0,intValueEtaLow=0,intValueEtaUp=0; | |
241 | // interpolate, at etaLow, between ptLow and ptUp | |
242 | intValueEtaLow = (*fParams)(ptLow,etaLow)+ | |
243 | ((*fParams)(ptUp,etaLow)-(*fParams)(ptLow,etaLow))/ | |
244 | (fPt->At(ptUp)-fPt->At(ptLow))*(pt-fPt->At(ptLow)); | |
245 | // interpolate, at etaUp, between ptLow and ptUp | |
246 | intValueEtaUp = (*fParams)(ptLow,etaUp)+ | |
247 | ((*fParams)(ptUp,etaUp)-(*fParams)(ptLow,etaUp))/ | |
248 | (fPt->At(ptUp)-fPt->At(ptLow))*(pt-fPt->At(ptLow)); | |
249 | // interpolate, at pt, between etaLow and etaUp | |
250 | intValue = intValueEtaLow+ | |
251 | (intValueEtaUp-intValueEtaLow)/ | |
252 | (fEta->At(etaUp)-fEta->At(etaLow))*(eta-fEta->At(etaLow)); | |
253 | ||
254 | if(intValue<0.) intValue=0.; | |
255 | return intValue; | |
256 | } | |
257 | //-------------------------------------------------------------------------- | |
258 | void AliTPCkineGrid::SetParam(Int_t i,Double_t par) { | |
259 | //-------------------------------------------------------------------------- | |
260 | // This functions allows to set parameters using only one index | |
261 | //-------------------------------------------------------------------------- | |
262 | Int_t ipt = (Int_t)i/fNeta; | |
263 | Int_t ieta = i-ipt*fNeta; | |
264 | SetParam(ipt,ieta,par); | |
265 | ||
266 | return; | |
267 | } | |
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