commented define _ClusterTopology_ - to be used only for the special productions
[u/mrichter/AliRoot.git] / ITS / AliITSdEdxSamples.cxx
CommitLineData
9189f38b 1/**************************************************************************
2 * Copyright(c) 2009-2012, 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/* $Id$ */
16
17
18
19///////////////////////////////////////////////////////////////////
20// //
21// Class to store information for PID with ITS //
22// and truncated mean computation methods //
23// Origin: F.Prino, Torino, prino@to.infn.it //
24// //
25///////////////////////////////////////////////////////////////////
26
27#include "AliITSPidParams.h"
28#include "AliITSdEdxSamples.h"
29#include "AliLog.h"
30#include <TMath.h>
31
32ClassImp(AliITSdEdxSamples)
33
34//______________________________________________________________________
35AliITSdEdxSamples::AliITSdEdxSamples():TObject(),
36 fNSamples(0),
0d66557a 37 fClusterMap(0),
9189f38b 38 fP(0.),
0d66557a 39 fParticleSpecie(0),
40 fLayersForPid(0xFFFF)
9189f38b 41{
42 // Default constructor
92329a66 43 for(Int_t i=0; i<kMaxSamples; i++){
44 fdESamples[i]=0.;
45 fdxSamples[i]=0.;
cb0a52e0 46 fPAtSample[i]=0.;
47 }
9189f38b 48}
49
50//______________________________________________________________________
92329a66 51AliITSdEdxSamples::AliITSdEdxSamples(Int_t nSamples, Double_t* esamples, Double_t* xsamples, Double_t mom, Int_t specie) :
9189f38b 52 TObject(),
53 fNSamples(nSamples),
0d66557a 54 fClusterMap(0),
9189f38b 55 fP(mom),
0d66557a 56 fParticleSpecie(specie),
57 fLayersForPid(0xFFFF)
9189f38b 58{
59 // Standard constructor
92329a66 60 SetdESamples(nSamples,esamples);
61 SetdxSamples(nSamples,xsamples);
0d66557a 62 SetClusterMapFromdE();
92329a66 63}
64
65//______________________________________________________________________
66AliITSdEdxSamples::AliITSdEdxSamples(const AliITSdEdxSamples& source) :
67 TObject(),
68 fNSamples(source.fNSamples),
0d66557a 69 fClusterMap(source.fClusterMap),
92329a66 70 fP(source.fP),
0d66557a 71 fParticleSpecie(source.fParticleSpecie),
72 fLayersForPid(source.fLayersForPid)
92329a66 73{
74 // Copy constructor
8d91dc44 75 for(Int_t i=0; i<kMaxSamples; i++){
92329a66 76 fdESamples[i]=source.GetdESample(i);
77 fdxSamples[i]=source.GetdxSample(i);
78 fPAtSample[i]=source.GetMomentumAtSample(i);
79 }
9189f38b 80}
accb90b5 81//_____________________________________________________________________________
82AliITSdEdxSamples& AliITSdEdxSamples::operator=(const AliITSdEdxSamples &source){
83 // Assignment operator
84 if(this==&source) return *this;
85 ((TObject *)this)->operator=(source);
86 fNSamples = source.fNSamples;
87 fClusterMap = source.fClusterMap;
88 fP = source.fP;
89 fParticleSpecie = source.fParticleSpecie;
90 fLayersForPid = source.fLayersForPid;
91 for(Int_t i=0; i<kMaxSamples; i++){
92 fdESamples[i]=source.GetdESample(i);
93 fdxSamples[i]=source.GetdxSample(i);
94 fPAtSample[i]=source.GetMomentumAtSample(i);
95 }
fa8f5c53 96 return *this;
accb90b5 97}
98
9189f38b 99//______________________________________________________________________
92329a66 100void AliITSdEdxSamples::SetdESamples(Int_t nSamples, Double_t* samples){
9189f38b 101 // Set the samples
102
92329a66 103 if(nSamples>kMaxSamples){
104 AliWarning(Form("Too many dE samples,only first %d will be used",kMaxSamples));
105 fNSamples=kMaxSamples;
9189f38b 106 }else{
107 fNSamples=nSamples;
108 }
92329a66 109 for(Int_t i=0; i<fNSamples; i++) fdESamples[i]=samples[i];
110 for(Int_t i=fNSamples; i<kMaxSamples; i++) fdESamples[i]=0.;
9189f38b 111 return;
112}
113//______________________________________________________________________
92329a66 114void AliITSdEdxSamples::SetdxSamples(Int_t nSamples, Double_t* samples){
9189f38b 115 // Set the samples
92329a66 116
117 if(nSamples>kMaxSamples){
13242232 118 AliWarning(Form("Too many dx samples,only first %d will be used",kMaxSamples));
92329a66 119 fNSamples=kMaxSamples;
120 }else{
121 fNSamples=nSamples;
122 }
123 for(Int_t i=0; i<fNSamples; i++) fdxSamples[i]=samples[i];
124 for(Int_t i=fNSamples; i<kMaxSamples; i++) fdxSamples[i]=0.;
125 return;
126}
127
128//______________________________________________________________________
129void AliITSdEdxSamples::SetSamplesAndMomenta(Int_t nSamples, Double_t* esamples, Double_t* xsamples, Double_t* mom){
130 // Set the samples
131 SetdESamples(nSamples,esamples);
132 SetdxSamples(nSamples,xsamples);
9189f38b 133 for(Int_t i=0; i<fNSamples; i++) fPAtSample[i]=mom[i];
92329a66 134 for(Int_t i=fNSamples; i<kMaxSamples; i++) fPAtSample[i]=0.;
9189f38b 135 return;
136}
137//______________________________________________________________________
0d66557a 138void AliITSdEdxSamples::SetLayerSample(Int_t iLayer, Bool_t haspoint, Double_t dE, Double_t dx, Double_t p){
139 // set info from single layer
140 if(haspoint){
141 SetPointOnLayer(iLayer);
142 fdESamples[iLayer]=dE;
143 fdxSamples[iLayer]=dx;
144 fPAtSample[iLayer]=p;
145 }else{
146 if(HasPointOnLayer(iLayer)) fClusterMap-=(1<<iLayer);
147 fdESamples[iLayer]=0.;
148 fdxSamples[iLayer]=0.;
149 fPAtSample[iLayer]=0.;
150
151 }
152}
153//______________________________________________________________________
9189f38b 154Double_t AliITSdEdxSamples::GetTruncatedMean(Double_t frac, Double_t mindedx) const {
155 // compute truncated mean
156
157 Int_t nc=0;
92329a66 158 Double_t dedx[kMaxSamples];
9189f38b 159 for (Int_t il=0; il<fNSamples; il++) { // count good (>0) dE/dx values
92329a66 160 Double_t dedxsamp=GetdEdxSample(il);
0d66557a 161 if(HasPointOnLayer(il) && UseLayerForPid(il) && dedxsamp>mindedx){
92329a66 162 dedx[nc]= dedxsamp;
9189f38b 163 nc++;
92329a66 164 }
9189f38b 165 }
166 if(nc<1) return 0.;
0d66557a 167
9189f38b 168 Int_t swap; // sort in ascending order
169 do {
170 swap=0;
171 for (Int_t i=0; i<nc-1; i++) {
172 if (dedx[i]<=dedx[i+1]) continue;
173 Double_t tmp=dedx[i];
174 dedx[i]=dedx[i+1];
175 dedx[i+1]=tmp;
176 swap++;
177 }
178 } while (swap);
179
180 Double_t sumamp=0,sumweight=0;
92329a66 181 Double_t weight[kMaxSamples];
182 for(Int_t iw=0; iw<kMaxSamples; iw++) weight[iw]=0.;
9189f38b 183 Int_t lastUsed=(Int_t)(frac*nc+0.00001);
184 if(lastUsed==0) lastUsed=1;
92329a66 185 if(lastUsed>kMaxSamples) lastUsed=kMaxSamples;
9189f38b 186 for(Int_t iw=0; iw<lastUsed; iw++) weight[iw]=1.;
92329a66 187 if((frac*nc-lastUsed)>0.4 && lastUsed<kMaxSamples) weight[lastUsed]=0.5;
9189f38b 188 for (Int_t i=0; i<nc; i++) {
92329a66 189 // AliDebug(5,Form("dE/dx %f weight %f",dedx[i],weight[i]));
9189f38b 190 sumamp+= dedx[i]*weight[i];
191 sumweight+=weight[i];
192 }
193 if(sumweight>0.) return sumamp/sumweight;
194 else return 0.;
195
196}
197//______________________________________________________________________
198Double_t AliITSdEdxSamples::GetWeightedMean(Double_t mindedx) const {
199 // compute generalized mean with k=-2 (used by CMS)
9189f38b 200 Int_t nc=0;
92329a66 201 Double_t dedx[kMaxSamples];
9189f38b 202 for (Int_t il=0; il<fNSamples; il++) { // count good (>0) dE/dx values
92329a66 203 Double_t dedxsamp=GetdEdxSample(il);
0d66557a 204 if(HasPointOnLayer(il) && UseLayerForPid(il) && dedxsamp>mindedx){
92329a66 205 dedx[nc]= dedxsamp;
206 nc++;
9189f38b 207 }
208 }
209 if(nc<1) return 0.;
210
211 Double_t weiSum = 0.;
212 for (Int_t i=0; i<nc; i++) {
213 weiSum+=TMath::Power(dedx[i],-2);
214 }
215 Double_t wMean=0.;
216 if(weiSum>0.) wMean= TMath::Power(weiSum/nc,-0.5);
217 return wMean;
218
219}
220//______________________________________________________________________
b34fed4e 221void AliITSdEdxSamples::GetConditionalProbabilities(const AliITSPidParams* pars, Double_t condprob[AliPID::kSPECIES], Double_t mindedx) const {
9189f38b 222 // compute conditional probablilities
223 const Int_t nPart = 3;
224 Double_t itsProb[nPart] = {1,1,1}; // p, K, pi
225
226 for(Int_t iS=0; iS<fNSamples; iS++){
0d66557a 227 if(!HasPointOnLayer(iS)) continue;
228 if(!UseLayerForPid(iS)) continue;
9189f38b 229 Int_t iLayer=iS+3; // to match with present ITS
230 if(iLayer>6) iLayer=6; // all extra points are treated as SSD
92329a66 231 Float_t dedx = GetdEdxSample(iS);
232 if(dedx<mindedx) continue;
9189f38b 233 Float_t layProb = pars->GetLandauGausNorm(dedx,AliPID::kProton,fP,iLayer);
234 itsProb[0] *= layProb;
235
236 layProb = pars->GetLandauGausNorm(dedx,AliPID::kKaon,fP,iLayer);
237 if (fP < 0.16) layProb=0.00001;
238 itsProb[1] *= layProb;
239
240 layProb = pars->GetLandauGausNorm(dedx,AliPID::kPion,fP,iLayer);
241 itsProb[2] *= layProb;
242 }
243
244 // Normalise probabilities
245 Double_t sumProb = 0;
246 for (Int_t iPart = 0; iPart < nPart; iPart++) {
247 sumProb += itsProb[iPart];
248 }
249 sumProb += 2*itsProb[2]; // muon and electron cannot be distinguished from pions
250
251 for (Int_t iPart = 0; iPart < nPart; iPart++) {
252 itsProb[iPart]/=sumProb;
253 }
254
255 condprob[AliPID::kElectron] = itsProb[2];
256 condprob[AliPID::kMuon] = itsProb[2];
257 condprob[AliPID::kPion] = itsProb[2];
258 condprob[AliPID::kKaon] = itsProb[1];
259 condprob[AliPID::kProton] = itsProb[0];
260 return;
261
262}
0d66557a 263//______________________________________________________________________
264void AliITSdEdxSamples::PrintAll() const{
265 // print all the infos
266 printf("Particle %d momentum %f GeV/c, number of points %d\n",
267 GetParticleSpecieMC(),
268 fP,
269 GetNumberOfEffectiveSamples());
270 for(Int_t iLay=0; iLay<fNSamples; iLay++){
271 printf(" Layer %d Point %d dE %f keV dx %f cm mom %f GeV/c\n",iLay,
272 HasPointOnLayer(iLay),
273 GetdESample(iLay),
274 GetdxSample(iLay),
275 GetMomentumAtSample(iLay));
276 }
277
278 printf("Layers used for PID:\n");
279 printf("Layer ");
280 for(Int_t iLay=0; iLay<fNSamples; iLay++){
281 printf("%d ",iLay);
282 }
283 printf("\n");
284
285 printf("Use ");
286 for(Int_t iLay=0; iLay<fNSamples; iLay++){
287 printf("%d ",UseLayerForPid(iLay));
288 }
289 printf("\n");
290 printf("Truncated mean = %f\n",GetTruncatedMean());
291}
292//______________________________________________________________________
293void AliITSdEdxSamples::PrintClusterMap() const{
294 // print the cluster map
295
296 printf("Layer ");
297 for(Int_t iLay=0; iLay<fNSamples; iLay++){
298 printf("%d ",iLay);
299 }
300 printf("\n");
301
302 printf("Point ");
303 for(Int_t iLay=0; iLay<fNSamples; iLay++){
304 printf("%d ",HasPointOnLayer(iLay));
305 }
306 printf("\n");
307}