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e4f2f73d | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, 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 | ||
16 | /* $Id$ */ | |
17 | ||
18 | //////////////////////////////////////////////////////////////////////////// | |
19 | // // | |
20 | // The TRD track seed // | |
21 | // // | |
22 | // Authors: // | |
23 | // Alex Bercuci <A.Bercuci@gsi.de> // | |
24 | // Markus Fasel <M.Fasel@gsi.de> // | |
25 | // // | |
26 | //////////////////////////////////////////////////////////////////////////// | |
27 | ||
28 | #include "TMath.h" | |
29 | #include "TLinearFitter.h" | |
eb38ed55 | 30 | #include "TClonesArray.h" // tmp |
31 | #include <TTreeStream.h> | |
e4f2f73d | 32 | |
33 | #include "AliLog.h" | |
34 | #include "AliMathBase.h" | |
35 | ||
36 | #include "AliTRDseedV1.h" | |
37 | #include "AliTRDcluster.h" | |
0906e73e | 38 | #include "AliTRDtrack.h" |
e4f2f73d | 39 | #include "AliTRDcalibDB.h" |
eb38ed55 | 40 | #include "AliTRDchamberTimeBin.h" |
41 | #include "AliTRDtrackingChamber.h" | |
42 | #include "AliTRDtrackerV1.h" | |
43 | #include "AliTRDReconstructor.h" | |
e4f2f73d | 44 | #include "AliTRDrecoParam.h" |
0906e73e | 45 | #include "AliTRDgeometry.h" |
46 | #include "Cal/AliTRDCalPID.h" | |
e4f2f73d | 47 | |
e4f2f73d | 48 | ClassImp(AliTRDseedV1) |
49 | ||
50 | //____________________________________________________________________ | |
eb38ed55 | 51 | AliTRDseedV1::AliTRDseedV1(Int_t plane) |
e4f2f73d | 52 | :AliTRDseed() |
eb38ed55 | 53 | ,fPlane(plane) |
0906e73e | 54 | ,fMom(0.) |
bcb6fb78 | 55 | ,fSnp(0.) |
56 | ,fTgl(0.) | |
57 | ,fdX(0.) | |
e4f2f73d | 58 | { |
59 | // | |
60 | // Constructor | |
61 | // | |
0906e73e | 62 | for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = 0.; |
0906e73e | 63 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.; |
e4f2f73d | 64 | } |
65 | ||
66 | //____________________________________________________________________ | |
0906e73e | 67 | AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref) |
e4f2f73d | 68 | :AliTRDseed((AliTRDseed&)ref) |
0906e73e | 69 | ,fPlane(ref.fPlane) |
0906e73e | 70 | ,fMom(ref.fMom) |
bcb6fb78 | 71 | ,fSnp(ref.fSnp) |
72 | ,fTgl(ref.fTgl) | |
73 | ,fdX(ref.fdX) | |
e4f2f73d | 74 | { |
75 | // | |
76 | // Copy Constructor performing a deep copy | |
77 | // | |
78 | ||
79 | //AliInfo(""); | |
0906e73e | 80 | for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = ref.fdEdx[islice]; |
0906e73e | 81 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = ref.fProb[ispec]; |
fbb2ea06 | 82 | } |
d9950a5a | 83 | |
0906e73e | 84 | |
e4f2f73d | 85 | //____________________________________________________________________ |
86 | AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref) | |
87 | { | |
88 | // | |
89 | // Assignment Operator using the copy function | |
90 | // | |
91 | ||
92 | //AliInfo(""); | |
93 | if(this != &ref){ | |
94 | ref.Copy(*this); | |
95 | } | |
96 | return *this; | |
97 | ||
98 | } | |
99 | ||
100 | //____________________________________________________________________ | |
101 | AliTRDseedV1::~AliTRDseedV1() | |
102 | { | |
103 | // | |
104 | // Destructor. The RecoParam object belongs to the underlying tracker. | |
105 | // | |
106 | ||
107 | //AliInfo(Form("fOwner[%s]", fOwner?"YES":"NO")); | |
108 | ||
47d5d320 | 109 | if(IsOwner()) |
0906e73e | 110 | for(int itb=0; itb<knTimebins; itb++){ |
111 | if(!fClusters[itb]) continue; | |
112 | //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb)); | |
113 | delete fClusters[itb]; | |
114 | fClusters[itb] = 0x0; | |
115 | } | |
e4f2f73d | 116 | } |
117 | ||
118 | //____________________________________________________________________ | |
119 | void AliTRDseedV1::Copy(TObject &ref) const | |
120 | { | |
121 | // | |
122 | // Copy function | |
123 | // | |
124 | ||
125 | //AliInfo(""); | |
126 | AliTRDseedV1 &target = (AliTRDseedV1 &)ref; | |
127 | ||
0906e73e | 128 | target.fPlane = fPlane; |
129 | target.fMom = fMom; | |
bcb6fb78 | 130 | target.fSnp = fSnp; |
131 | target.fTgl = fTgl; | |
132 | target.fdX = fdX; | |
0906e73e | 133 | |
134 | for(int islice=0; islice < knSlices; islice++) target.fdEdx[islice] = fdEdx[islice]; | |
0906e73e | 135 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) target.fProb[ispec] = fProb[ispec]; |
136 | ||
e4f2f73d | 137 | AliTRDseed::Copy(target); |
138 | } | |
139 | ||
0906e73e | 140 | |
141 | //____________________________________________________________ | |
51863bc0 | 142 | Bool_t AliTRDseedV1::Init(AliTRDtrack *track) |
0906e73e | 143 | { |
144 | // Initialize this tracklet using the track information | |
145 | // | |
146 | // Parameters: | |
147 | // track - the TRD track used to initialize the tracklet | |
148 | // | |
149 | // Detailed description | |
150 | // The function sets the starting point and direction of the | |
151 | // tracklet according to the information from the TRD track. | |
152 | // | |
153 | // Caution | |
154 | // The TRD track has to be propagated to the beginning of the | |
155 | // chamber where the tracklet will be constructed | |
156 | // | |
157 | ||
158 | Double_t y, z; | |
51863bc0 | 159 | if(!track->GetProlongation(fX0, y, z)) return kFALSE; |
0906e73e | 160 | fYref[0] = y; |
33f721e9 | 161 | fYref[1] = track->GetSnp()/(1. - track->GetSnp()*track->GetSnp()); |
0906e73e | 162 | fZref[0] = z; |
33f721e9 | 163 | fZref[1] = track->GetTgl(); |
0906e73e | 164 | |
165 | //printf("Tracklet ref x[%7.3f] y[%7.3f] z[%7.3f], snp[%f] tgl[%f]\n", fX0, fYref[0], fZref[0], track->GetSnp(), track->GetTgl()); | |
51863bc0 | 166 | return kTRUE; |
0906e73e | 167 | } |
168 | ||
bcb6fb78 | 169 | |
170 | //____________________________________________________________________ | |
171 | void AliTRDseedV1::CookdEdx(Int_t nslices) | |
172 | { | |
173 | // Calculates average dE/dx for all slices and store them in the internal array fdEdx. | |
174 | // | |
175 | // Parameters: | |
176 | // nslices : number of slices for which dE/dx should be calculated | |
177 | // Output: | |
178 | // store results in the internal array fdEdx. This can be accessed with the method | |
179 | // AliTRDseedV1::GetdEdx() | |
180 | // | |
181 | // Detailed description | |
182 | // Calculates average dE/dx for all slices. Depending on the PID methode | |
183 | // the number of slices can be 3 (LQ) or 8(NN). | |
184 | // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) i.e. | |
185 | // | |
186 | // dQ/dl = qc/(dx * sqrt(1 + dy/dx^2 + dz/dx^2)) | |
187 | // | |
188 | // The following effects are included in the calculation: | |
189 | // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice) | |
190 | // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing()) | |
191 | // 3. cluster size | |
192 | // | |
193 | ||
194 | Int_t nclusters[knSlices]; | |
195 | for(int i=0; i<knSlices; i++){ | |
196 | fdEdx[i] = 0.; | |
197 | nclusters[i] = 0; | |
198 | } | |
199 | Float_t clength = (/*.5 * */AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
200 | ||
201 | AliTRDcluster *cluster = 0x0; | |
2985ffcb | 202 | for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){ |
bcb6fb78 | 203 | if(!(cluster = fClusters[ic])) continue; |
204 | Float_t x = cluster->GetX(); | |
205 | ||
206 | // Filter clusters for dE/dx calculation | |
207 | ||
208 | // 1.consider calibration effects for slice determination | |
209 | Int_t slice; | |
210 | if(cluster->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / clength); | |
211 | else slice = x < fX0 ? 0 : nslices-1; | |
212 | ||
213 | // 2. take sharing into account | |
214 | Float_t w = cluster->IsShared() ? .5 : 1.; | |
215 | ||
216 | // 3. take into account large clusters TODO | |
217 | //w *= c->GetNPads() > 3 ? .8 : 1.; | |
218 | ||
219 | //CHECK !!! | |
220 | fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic]; | |
221 | nclusters[slice]++; | |
222 | } // End of loop over clusters | |
223 | ||
b83573da | 224 | if(AliTRDReconstructor::RecoParam()->GetPIDMethod() == 0){ |
225 | // calculate mean charge per slice (only LQ PID) | |
226 | for(int is=0; is<nslices; is++){ | |
227 | if(nclusters[is]) fdEdx[is] /= nclusters[is]; | |
228 | } | |
229 | } | |
bcb6fb78 | 230 | } |
231 | ||
b83573da | 232 | |
bcb6fb78 | 233 | //____________________________________________________________________ |
234 | Float_t AliTRDseedV1::GetdQdl(Int_t ic) const | |
235 | { | |
10f75631 | 236 | return fClusters[ic] ? TMath::Abs(fClusters[ic]->GetQ()) /fdX / TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]) : 0.; |
bcb6fb78 | 237 | } |
238 | ||
0906e73e | 239 | //____________________________________________________________________ |
240 | Double_t* AliTRDseedV1::GetProbability() | |
241 | { | |
242 | // Fill probability array for tracklet from the DB. | |
243 | // | |
244 | // Parameters | |
245 | // | |
246 | // Output | |
247 | // returns pointer to the probability array and 0x0 if missing DB access | |
248 | // | |
249 | // Detailed description | |
250 | ||
251 | ||
252 | // retrive calibration db | |
253 | AliTRDcalibDB *calibration = AliTRDcalibDB::Instance(); | |
254 | if (!calibration) { | |
255 | AliError("No access to calibration data"); | |
256 | return 0x0; | |
257 | } | |
258 | ||
259 | // Retrieve the CDB container class with the parametric detector response | |
eb38ed55 | 260 | const AliTRDCalPID *pd = calibration->GetPIDObject(AliTRDReconstructor::RecoParam()->GetPIDMethod()); |
0906e73e | 261 | if (!pd) { |
262 | AliError("No access to AliTRDCalPID object"); | |
263 | return 0x0; | |
264 | } | |
10f75631 | 265 | //AliInfo(Form("Method[%d] : %s", AliTRDReconstructor::RecoParam()->GetPIDMethod(), pd->IsA()->GetName())); |
266 | ||
0906e73e | 267 | // calculate tracklet length TO DO |
268 | Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
269 | /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane])); | |
270 | ||
271 | //calculate dE/dx | |
eb38ed55 | 272 | CookdEdx(AliTRDReconstructor::RecoParam()->GetNdEdxSlices()); |
0906e73e | 273 | |
274 | // Sets the a priori probabilities | |
275 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) { | |
276 | fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, fPlane); | |
277 | } | |
278 | ||
279 | return &fProb[0]; | |
280 | } | |
281 | ||
e4f2f73d | 282 | //____________________________________________________________________ |
283 | Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const | |
284 | { | |
285 | // | |
286 | // Returns a quality measurement of the current seed | |
287 | // | |
288 | ||
289 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; | |
eb38ed55 | 290 | return |
291 | .5 * TMath::Abs(18.0 - fN2) | |
e4f2f73d | 292 | + 10.* TMath::Abs(fYfit[1] - fYref[1]) |
eb38ed55 | 293 | + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr) |
e4f2f73d | 294 | + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength; |
295 | } | |
296 | ||
0906e73e | 297 | //____________________________________________________________________ |
298 | void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const | |
299 | { | |
300 | // Computes covariance in the y-z plane at radial point x | |
301 | ||
eb38ed55 | 302 | Int_t ic = 0; while (!fClusters[ic]) ic++; |
303 | AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance(); | |
304 | Double_t exB = fCalib->GetOmegaTau(fCalib->GetVdriftAverage(fClusters[ic]->GetDetector()), -AliTracker::GetBz()*0.1); | |
305 | ||
306 | Double_t sy2 = fSigmaY2*fSigmaY2 + .2*(fYfit[1]-exB)*(fYfit[1]-exB); | |
0906e73e | 307 | Double_t sz2 = fPadLength/12.; |
308 | ||
eb38ed55 | 309 | |
0906e73e | 310 | //printf("Yfit[1] %f sy20 %f SigmaY2 %f\n", fYfit[1], sy20, fSigmaY2); |
311 | ||
312 | cov[0] = sy2; | |
313 | cov[1] = fTilt*(sy2-sz2); | |
314 | cov[2] = sz2; | |
315 | } | |
316 | ||
0906e73e | 317 | |
318 | //____________________________________________________________________ | |
319 | void AliTRDseedV1::SetOwner(Bool_t own) | |
320 | { | |
321 | //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO")); | |
322 | ||
323 | if(own){ | |
324 | for(int ic=0; ic<knTimebins; ic++){ | |
325 | if(!fClusters[ic]) continue; | |
326 | fClusters[ic] = new AliTRDcluster(*fClusters[ic]); | |
327 | } | |
47d5d320 | 328 | SetBit(1); |
0906e73e | 329 | } else { |
47d5d320 | 330 | if(IsOwner()){ |
0906e73e | 331 | for(int ic=0; ic<knTimebins; ic++){ |
332 | if(!fClusters[ic]) continue; | |
333 | delete fClusters[ic]; | |
334 | //fClusters[ic] = tracker->GetClusters(index) TODO | |
335 | } | |
336 | } | |
47d5d320 | 337 | SetBit(1, kFALSE); |
0906e73e | 338 | } |
339 | } | |
340 | ||
e4f2f73d | 341 | //____________________________________________________________________ |
eb38ed55 | 342 | Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c) |
e4f2f73d | 343 | { |
344 | // | |
345 | // Iterative process to register clusters to the seed. | |
346 | // In iteration 0 we try only one pad-row and if quality not | |
347 | // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows) | |
348 | // | |
eb38ed55 | 349 | // debug level 7 |
350 | // | |
e4f2f73d | 351 | |
eb38ed55 | 352 | if(!AliTRDReconstructor::RecoParam()){ |
e4f2f73d | 353 | AliError("Seed can not be used without a valid RecoParam."); |
354 | return kFALSE; | |
355 | } | |
0906e73e | 356 | |
eb38ed55 | 357 | AliTRDchamberTimeBin *layer = 0x0; |
358 | if(AliTRDReconstructor::StreamLevel()>=7 && c){ | |
359 | TClonesArray clusters("AliTRDcluster", 24); | |
360 | clusters.SetOwner(kTRUE); | |
361 | AliTRDcluster *cc = 0x0; | |
362 | Int_t det=-1, ncl, ncls = 0; | |
2985ffcb | 363 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { |
eb38ed55 | 364 | if(!(layer = chamber->GetTB(iTime))) continue; |
365 | if(!(ncl = Int_t(*layer))) continue; | |
366 | for(int ic=0; ic<ncl; ic++){ | |
367 | cc = (*layer)[ic]; | |
368 | det = cc->GetDetector(); | |
369 | new(clusters[ncls++]) AliTRDcluster(*cc); | |
370 | } | |
371 | } | |
372 | AliInfo(Form("N clusters[%d] = %d", fPlane, ncls)); | |
373 | ||
374 | Int_t ref = c ? 1 : 0; | |
375 | TTreeSRedirector &cstreamer = *AliTRDtrackerV1::DebugStreamer(); | |
376 | cstreamer << "AttachClustersIter" | |
377 | << "det=" << det | |
378 | << "ref=" << ref | |
379 | << "clusters.=" << &clusters | |
380 | << "tracklet.=" << this | |
381 | << "cl.=" << c | |
382 | << "\n"; | |
383 | } | |
0906e73e | 384 | |
e4f2f73d | 385 | Float_t tquality; |
eb38ed55 | 386 | Double_t kroady = AliTRDReconstructor::RecoParam()->GetRoad1y(); |
e4f2f73d | 387 | Double_t kroadz = fPadLength * .5 + 1.; |
388 | ||
389 | // initialize configuration parameters | |
390 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; | |
391 | Int_t niter = kZcorr ? 1 : 2; | |
392 | ||
393 | Double_t yexp, zexp; | |
394 | Int_t ncl = 0; | |
395 | // start seed update | |
396 | for (Int_t iter = 0; iter < niter; iter++) { | |
e4f2f73d | 397 | ncl = 0; |
2985ffcb | 398 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { |
eb38ed55 | 399 | if(!(layer = chamber->GetTB(iTime))) continue; |
400 | if(!Int_t(*layer)) continue; | |
401 | ||
e4f2f73d | 402 | // define searching configuration |
eb38ed55 | 403 | Double_t dxlayer = layer->GetX() - fX0; |
e4f2f73d | 404 | if(c){ |
405 | zexp = c->GetZ(); | |
406 | //Try 2 pad-rows in second iteration | |
407 | if (iter > 0) { | |
408 | zexp = fZref[0] + fZref[1] * dxlayer - zcorr; | |
409 | if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5; | |
410 | if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5; | |
411 | } | |
eb38ed55 | 412 | } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.); |
e4f2f73d | 413 | yexp = fYref[0] + fYref[1] * dxlayer - zcorr; |
bcb6fb78 | 414 | |
415 | // Get and register cluster | |
eb38ed55 | 416 | Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz); |
e4f2f73d | 417 | if (index < 0) continue; |
eb38ed55 | 418 | AliTRDcluster *cl = (*layer)[index]; |
e4f2f73d | 419 | |
eb38ed55 | 420 | fIndexes[iTime] = layer->GetGlobalIndex(index); |
e4f2f73d | 421 | fClusters[iTime] = cl; |
e4f2f73d | 422 | fY[iTime] = cl->GetY(); |
423 | fZ[iTime] = cl->GetZ(); | |
e4f2f73d | 424 | ncl++; |
425 | } | |
eb38ed55 | 426 | if(AliTRDReconstructor::StreamLevel()>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fPlane, ncl)); |
bcb6fb78 | 427 | |
eb38ed55 | 428 | if(ncl>1){ |
bcb6fb78 | 429 | // calculate length of the time bin (calibration aware) |
430 | Int_t irp = 0; Float_t x[2]; Int_t tb[2]; | |
2985ffcb | 431 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { |
bcb6fb78 | 432 | if(!fClusters[iTime]) continue; |
433 | x[irp] = fClusters[iTime]->GetX(); | |
434 | tb[irp] = iTime; | |
435 | irp++; | |
436 | if(irp==2) break; | |
437 | } | |
438 | fdX = (x[1] - x[0]) / (tb[0] - tb[1]); | |
439 | ||
440 | // update X0 from the clusters (calibration/alignment aware) | |
2985ffcb | 441 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { |
eb38ed55 | 442 | if(!(layer = chamber->GetTB(iTime))) continue; |
443 | if(!layer->IsT0()) continue; | |
bcb6fb78 | 444 | if(fClusters[iTime]){ |
445 | fX0 = fClusters[iTime]->GetX(); | |
446 | break; | |
447 | } else { // we have to infere the position of the anode wire from the other clusters | |
2985ffcb | 448 | for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) { |
bcb6fb78 | 449 | if(!fClusters[jTime]) continue; |
450 | fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime); | |
451 | } | |
452 | break; | |
453 | } | |
454 | } | |
455 | ||
456 | // update YZ reference point | |
457 | // TODO | |
458 | ||
459 | // update x reference positions (calibration/alignment aware) | |
2985ffcb | 460 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { |
bcb6fb78 | 461 | if(!fClusters[iTime]) continue; |
462 | fX[iTime] = fClusters[iTime]->GetX() - fX0; | |
463 | } | |
464 | ||
465 | AliTRDseed::Update(); | |
466 | } | |
eb38ed55 | 467 | if(AliTRDReconstructor::StreamLevel()>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fPlane, fN2)); |
bcb6fb78 | 468 | |
e4f2f73d | 469 | if(IsOK()){ |
470 | tquality = GetQuality(kZcorr); | |
471 | if(tquality < quality) break; | |
472 | else quality = tquality; | |
473 | } | |
474 | kroadz *= 2.; | |
475 | } // Loop: iter | |
476 | if (!IsOK()) return kFALSE; | |
477 | ||
478 | CookLabels(); | |
479 | UpdateUsed(); | |
480 | return kTRUE; | |
481 | } | |
482 | ||
483 | //____________________________________________________________________ | |
eb38ed55 | 484 | Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber |
0906e73e | 485 | ,Bool_t kZcorr) |
e4f2f73d | 486 | { |
487 | // | |
488 | // Projective algorithm to attach clusters to seeding tracklets | |
489 | // | |
490 | // Parameters | |
491 | // | |
492 | // Output | |
493 | // | |
494 | // Detailed description | |
495 | // 1. Collapse x coordinate for the full detector plane | |
496 | // 2. truncated mean on y (r-phi) direction | |
497 | // 3. purge clusters | |
498 | // 4. truncated mean on z direction | |
499 | // 5. purge clusters | |
500 | // 6. fit tracklet | |
501 | // | |
502 | ||
eb38ed55 | 503 | if(!AliTRDReconstructor::RecoParam()){ |
e4f2f73d | 504 | AliError("Seed can not be used without a valid RecoParam."); |
505 | return kFALSE; | |
506 | } | |
507 | ||
0906e73e | 508 | const Int_t kClusterCandidates = 2 * knTimebins; |
e4f2f73d | 509 | |
510 | //define roads | |
eb38ed55 | 511 | Double_t kroady = AliTRDReconstructor::RecoParam()->GetRoad1y(); |
e4f2f73d | 512 | Double_t kroadz = fPadLength * 1.5 + 1.; |
513 | // correction to y for the tilting angle | |
514 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; | |
515 | ||
516 | // working variables | |
517 | AliTRDcluster *clusters[kClusterCandidates]; | |
0906e73e | 518 | Double_t cond[4], yexp[knTimebins], zexp[knTimebins], |
e4f2f73d | 519 | yres[kClusterCandidates], zres[kClusterCandidates]; |
0906e73e | 520 | Int_t ncl, *index = 0x0, tboundary[knTimebins]; |
e4f2f73d | 521 | |
522 | // Do cluster projection | |
eb38ed55 | 523 | AliTRDchamberTimeBin *layer = 0x0; |
e4f2f73d | 524 | Int_t nYclusters = 0; Bool_t kEXIT = kFALSE; |
2985ffcb | 525 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { |
eb38ed55 | 526 | if(!(layer = chamber->GetTB(iTime))) continue; |
527 | if(!Int_t(*layer)) continue; | |
528 | ||
529 | fX[iTime] = layer->GetX() - fX0; | |
e4f2f73d | 530 | zexp[iTime] = fZref[0] + fZref[1] * fX[iTime]; |
531 | yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr; | |
532 | ||
533 | // build condition and process clusters | |
534 | cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady; | |
535 | cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz; | |
eb38ed55 | 536 | layer->GetClusters(cond, index, ncl); |
e4f2f73d | 537 | for(Int_t ic = 0; ic<ncl; ic++){ |
eb38ed55 | 538 | AliTRDcluster *c = layer->GetCluster(index[ic]); |
e4f2f73d | 539 | clusters[nYclusters] = c; |
540 | yres[nYclusters++] = c->GetY() - yexp[iTime]; | |
541 | if(nYclusters >= kClusterCandidates) { | |
542 | AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates)); | |
543 | kEXIT = kTRUE; | |
544 | break; | |
545 | } | |
546 | } | |
547 | tboundary[iTime] = nYclusters; | |
548 | if(kEXIT) break; | |
549 | } | |
550 | ||
551 | // Evaluate truncated mean on the y direction | |
552 | Double_t mean, sigma; | |
553 | AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2); | |
eb38ed55 | 554 | // purge cluster candidates |
e4f2f73d | 555 | Int_t nZclusters = 0; |
556 | for(Int_t ic = 0; ic<nYclusters; ic++){ | |
557 | if(yres[ic] - mean > 4. * sigma){ | |
558 | clusters[ic] = 0x0; | |
559 | continue; | |
560 | } | |
561 | zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()]; | |
562 | } | |
563 | ||
564 | // Evaluate truncated mean on the z direction | |
565 | AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2); | |
eb38ed55 | 566 | // purge cluster candidates |
e4f2f73d | 567 | for(Int_t ic = 0; ic<nZclusters; ic++){ |
568 | if(zres[ic] - mean > 4. * sigma){ | |
569 | clusters[ic] = 0x0; | |
570 | continue; | |
571 | } | |
572 | } | |
573 | ||
574 | ||
575 | // Select only one cluster/TimeBin | |
576 | Int_t lastCluster = 0; | |
577 | fN2 = 0; | |
2985ffcb | 578 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { |
e4f2f73d | 579 | ncl = tboundary[iTime] - lastCluster; |
580 | if(!ncl) continue; | |
eb38ed55 | 581 | Int_t iptr = lastCluster; |
582 | if(ncl > 1){ | |
583 | Float_t dold = 9999.; | |
e4f2f73d | 584 | for(int ic=lastCluster; ic<tboundary[iTime]; ic++){ |
585 | if(!clusters[ic]) continue; | |
586 | Float_t y = yexp[iTime] - clusters[ic]->GetY(); | |
587 | Float_t z = zexp[iTime] - clusters[ic]->GetZ(); | |
588 | Float_t d = y * y + z * z; | |
589 | if(d > dold) continue; | |
590 | dold = d; | |
591 | iptr = ic; | |
592 | } | |
e4f2f73d | 593 | } |
eb38ed55 | 594 | fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr); |
595 | fClusters[iTime] = clusters[iptr]; | |
596 | fY[iTime] = clusters[iptr]->GetY(); | |
597 | fZ[iTime] = clusters[iptr]->GetZ(); | |
0906e73e | 598 | lastCluster = tboundary[iTime]; |
e4f2f73d | 599 | fN2++; |
600 | } | |
601 | ||
602 | // number of minimum numbers of clusters expected for the tracklet | |
2985ffcb | 603 | Int_t kClmin = Int_t(AliTRDReconstructor::RecoParam()->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins()); |
e4f2f73d | 604 | if (fN2 < kClmin){ |
605 | AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin)); | |
606 | fN2 = 0; | |
607 | return kFALSE; | |
608 | } | |
0906e73e | 609 | |
610 | // update used clusters | |
611 | fNUsed = 0; | |
2985ffcb | 612 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { |
0906e73e | 613 | if(!fClusters[iTime]) continue; |
614 | if((fClusters[iTime]->IsUsed())) fNUsed++; | |
615 | } | |
616 | ||
617 | if (fN2-fNUsed < kClmin){ | |
618 | AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2)); | |
619 | fN2 = 0; | |
620 | return kFALSE; | |
621 | } | |
e4f2f73d | 622 | |
e4f2f73d | 623 | return kTRUE; |
624 | } | |
625 | ||
626 | //____________________________________________________________________ | |
0906e73e | 627 | Bool_t AliTRDseedV1::Fit() |
e4f2f73d | 628 | { |
629 | // | |
630 | // Linear fit of the tracklet | |
631 | // | |
632 | // Parameters : | |
633 | // | |
634 | // Output : | |
635 | // True if successful | |
636 | // | |
637 | // Detailed description | |
638 | // 2. Check if tracklet crosses pad row boundary | |
639 | // 1. Calculate residuals in the y (r-phi) direction | |
640 | // 3. Do a Least Square Fit to the data | |
641 | // | |
642 | ||
47d5d320 | 643 | const Int_t kClmin = 8; |
644 | const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins(); | |
8acca6a3 | 645 | AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ; |
47d5d320 | 646 | |
647 | // convertion factor from square to gauss distribution for sigma | |
648 | Double_t convert = 1./TMath::Sqrt(12.); | |
649 | ||
650 | // book cluster information | |
8acca6a3 | 651 | Double_t xc[knTimebins+1], yc[knTimebins], zc[knTimebins+1], sy[knTimebins], sz[knTimebins+1]; |
47d5d320 | 652 | Int_t zRow[knTimebins]; |
653 | AliTRDcluster *c = 0x0; | |
654 | Int_t nc = 0; | |
655 | for (Int_t ic=0; ic<kNtb; ic++) { | |
656 | zRow[ic] = -1; | |
657 | xc[ic] = -1.; | |
658 | yc[ic] = 999.; | |
659 | zc[ic] = 999.; | |
660 | sy[ic] = 0.; | |
661 | sz[ic] = 0.; | |
662 | if(!(c = fClusters[ic])) continue; | |
663 | if(!c->IsInChamber()) continue; | |
664 | Float_t w = 1.; | |
665 | if(c->GetNPads()>4) w = .5; | |
666 | if(c->GetNPads()>5) w = .2; | |
667 | zRow[nc] = c->GetPadRow(); | |
668 | xc[nc] = fX0 - c->GetX(); | |
669 | yc[nc] = c->GetY(); | |
670 | zc[nc] = c->GetZ(); | |
671 | sy[ic] = w; // all clusters have the same sigma | |
672 | sz[ic] = fPadLength*convert; | |
8acca6a3 | 673 | fitterZ.AddPoint(&xc[ic], zc[ic], sz[ic]); |
47d5d320 | 674 | nc++; |
675 | } | |
676 | // to few clusters | |
677 | if (nc < kClmin) return kFALSE; | |
678 | ||
e4f2f73d | 679 | |
47d5d320 | 680 | Int_t zN[2*35]; |
681 | Int_t nz = AliTRDtrackerV1::Freq(nc, zRow, zN, kFALSE); | |
682 | // more than one pad row crossing | |
683 | if(nz>2) return kFALSE; | |
e4f2f73d | 684 | |
47d5d320 | 685 | // estimate reference parameter at average x |
686 | Double_t y0 = fYref[0]; | |
687 | Double_t dydx = fYref[1]; | |
688 | Double_t dzdx = fZref[1]; | |
689 | zc[nc] = fZref[0]; | |
690 | ||
691 | // determine z offset of the fit | |
692 | Int_t nchanges = 0, nCross = 0; | |
693 | if(nz==2){ // tracklet is crossing pad row | |
694 | // Find the break time allowing one chage on pad-rows | |
695 | // with maximal number of accepted clusters | |
696 | Int_t padRef = zRow[0]; | |
697 | for (Int_t ic=1; ic<nc; ic++) { | |
698 | if(zRow[ic] == padRef) continue; | |
699 | ||
700 | // debug | |
701 | if(zRow[ic-1] == zRow[ic]){ | |
702 | printf("ERROR in pad row change!!!\n"); | |
703 | } | |
704 | ||
705 | // evaluate parameters of the crossing point | |
706 | Float_t sx = (xc[ic-1] - xc[ic])*convert; | |
707 | xc[nc] = .5 * (xc[ic-1] + xc[ic]); | |
708 | zc[nc] = .5 * (zc[ic-1] + zc[ic]); | |
709 | sz[nc] = TMath::Max(dzdx * sx, .01); | |
710 | dzdx = zc[ic-1] > zc[ic] ? 1. : -1.; | |
711 | padRef = zRow[ic]; | |
712 | nCross = ic; | |
713 | nchanges++; | |
714 | } | |
e4f2f73d | 715 | } |
716 | ||
47d5d320 | 717 | // condition on nCross and reset nchanges TODO |
718 | ||
47d5d320 | 719 | if(nchanges==1){ |
720 | if(dzdx * fZref[1] < 0.){ | |
721 | AliInfo("tracklet direction does not correspond to the track direction. TODO."); | |
722 | } | |
723 | SetBit(2, kTRUE); // mark pad row crossing | |
724 | fCross[0] = xc[nc]; fCross[2] = zc[nc]; fCross[3] = sz[nc]; | |
8acca6a3 | 725 | fitterZ.AddPoint(&xc[nc], zc[nc], sz[nc]); |
726 | fitterZ.Eval(); | |
727 | dzdx = fZref[1]; // we don't trust Parameter[1] ??; | |
728 | zc[nc] = fitterZ.GetFunctionParameter(0); | |
47d5d320 | 729 | } else if(nchanges > 1){ // debug |
730 | AliInfo("ERROR in n changes!!!"); | |
e4f2f73d | 731 | return kFALSE; |
732 | } | |
47d5d320 | 733 | |
734 | ||
735 | // estimate deviation from reference direction | |
736 | dzdx *= fTilt; | |
737 | for (Int_t ic=0; ic<nc; ic++) { | |
738 | yc[ic] -= y0 + xc[ic]*(dydx + dzdx) + fTilt * (zc[ic] - zc[nc]); | |
8acca6a3 | 739 | fitterY.AddPoint(&xc[ic], yc[ic], sy[ic]); |
e4f2f73d | 740 | } |
8acca6a3 | 741 | fitterY.Eval(); |
742 | fYfit[0] = y0+fitterY.GetFunctionParameter(0); | |
743 | fYfit[1] = dydx+fitterY.GetFunctionParameter(1); | |
47d5d320 | 744 | if(nchanges) fCross[1] = fYfit[0] + fCross[0] * fYfit[1]; |
e4f2f73d | 745 | |
47d5d320 | 746 | // printf("\nnz = %d\n", nz); |
747 | // for(int ic=0; ic<35; ic++) printf("%d row[%d]\n", ic, zRow[ic]); | |
748 | // | |
749 | // for(int ic=0; ic<nz; ic++) printf("%d n[%d]\n", ic, zN[ic]); | |
e4f2f73d | 750 | |
751 | return kTRUE; | |
752 | } | |
753 | ||
47d5d320 | 754 | //___________________________________________________________________ |
755 | void AliTRDseedV1::Draw(Option_t*) | |
756 | { | |
757 | } | |
e4f2f73d | 758 | |
759 | //___________________________________________________________________ | |
47d5d320 | 760 | void AliTRDseedV1::Print(Option_t*) const |
e4f2f73d | 761 | { |
762 | // | |
763 | // Printing the seedstatus | |
764 | // | |
765 | ||
e4f2f73d | 766 | printf("Seed status :\n"); |
767 | printf(" fTilt = %f\n", fTilt); | |
768 | printf(" fPadLength = %f\n", fPadLength); | |
769 | printf(" fX0 = %f\n", fX0); | |
2985ffcb | 770 | for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++) { |
e4f2f73d | 771 | const Char_t *isUsable = fUsable[ic]?"Yes":"No"; |
0906e73e | 772 | printf(" %d X[%f] Y[%f] Z[%f] Indexes[%d] clusters[%p] usable[%s]\n" |
e4f2f73d | 773 | , ic |
774 | , fX[ic] | |
775 | , fY[ic] | |
776 | , fZ[ic] | |
777 | , fIndexes[ic] | |
0906e73e | 778 | , ((void*) fClusters[ic]) |
e4f2f73d | 779 | , isUsable); |
780 | } | |
781 | ||
782 | printf(" fYref[0] =%f fYref[1] =%f\n", fYref[0], fYref[1]); | |
783 | printf(" fZref[0] =%f fZref[1] =%f\n", fZref[0], fZref[1]); | |
784 | printf(" fYfit[0] =%f fYfit[1] =%f\n", fYfit[0], fYfit[1]); | |
785 | printf(" fYfitR[0]=%f fYfitR[1]=%f\n", fYfitR[0], fYfitR[1]); | |
786 | printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]); | |
787 | printf(" fZfitR[0]=%f fZfitR[1]=%f\n", fZfitR[0], fZfitR[1]); | |
788 | printf(" fSigmaY =%f\n", fSigmaY); | |
789 | printf(" fSigmaY2=%f\n", fSigmaY2); | |
790 | printf(" fMeanz =%f\n", fMeanz); | |
791 | printf(" fZProb =%f\n", fZProb); | |
792 | printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]); | |
793 | printf(" fN =%d\n", fN); | |
794 | printf(" fN2 =%d (>8 isOK)\n",fN2); | |
795 | printf(" fNUsed =%d\n", fNUsed); | |
796 | printf(" fFreq =%d\n", fFreq); | |
797 | printf(" fNChange=%d\n", fNChange); | |
798 | printf(" fMPads =%f\n", fMPads); | |
799 | ||
800 | printf(" fC =%f\n", fC); | |
801 | printf(" fCC =%f\n",fCC); | |
802 | printf(" fChi2 =%f\n", fChi2); | |
803 | printf(" fChi2Z =%f\n", fChi2Z); | |
e4f2f73d | 804 | } |
47d5d320 | 805 |