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e4f2f73d | 1 | /************************************************************************** |
29b87567 | 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 | **************************************************************************/ | |
e4f2f73d | 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 | ||
e4f2f73d | 36 | #include "AliTRDcluster.h" |
f3d3af1b | 37 | #include "AliTRDseedV1.h" |
38 | #include "AliTRDtrackV1.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() |
3a039a31 | 53 | ,fReconstructor(0x0) |
eb38ed55 | 54 | ,fPlane(plane) |
0906e73e | 55 | ,fMom(0.) |
bcb6fb78 | 56 | ,fSnp(0.) |
57 | ,fTgl(0.) | |
58 | ,fdX(0.) | |
e4f2f73d | 59 | { |
60 | // | |
61 | // Constructor | |
62 | // | |
29b87567 | 63 | //printf("AliTRDseedV1::AliTRDseedV1()\n"); |
e44586fb | 64 | |
29b87567 | 65 | for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = 0.; |
66 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.; | |
e4f2f73d | 67 | } |
68 | ||
69 | //____________________________________________________________________ | |
0906e73e | 70 | AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref) |
e4f2f73d | 71 | :AliTRDseed((AliTRDseed&)ref) |
43d6ad34 | 72 | ,fReconstructor(ref.fReconstructor) |
0906e73e | 73 | ,fPlane(ref.fPlane) |
0906e73e | 74 | ,fMom(ref.fMom) |
bcb6fb78 | 75 | ,fSnp(ref.fSnp) |
76 | ,fTgl(ref.fTgl) | |
77 | ,fdX(ref.fdX) | |
e4f2f73d | 78 | { |
79 | // | |
80 | // Copy Constructor performing a deep copy | |
81 | // | |
82 | ||
29b87567 | 83 | //printf("AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &)\n"); |
84 | SetBit(kOwner, kFALSE); | |
85 | for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = ref.fdEdx[islice]; | |
86 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = ref.fProb[ispec]; | |
fbb2ea06 | 87 | } |
d9950a5a | 88 | |
0906e73e | 89 | |
e4f2f73d | 90 | //____________________________________________________________________ |
91 | AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref) | |
92 | { | |
93 | // | |
94 | // Assignment Operator using the copy function | |
95 | // | |
96 | ||
29b87567 | 97 | if(this != &ref){ |
98 | ref.Copy(*this); | |
99 | } | |
100 | return *this; | |
e4f2f73d | 101 | |
102 | } | |
103 | ||
104 | //____________________________________________________________________ | |
105 | AliTRDseedV1::~AliTRDseedV1() | |
106 | { | |
107 | // | |
108 | // Destructor. The RecoParam object belongs to the underlying tracker. | |
109 | // | |
110 | ||
29b87567 | 111 | //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO"); |
e4f2f73d | 112 | |
29b87567 | 113 | if(IsOwner()) |
114 | for(int itb=0; itb<knTimebins; itb++){ | |
115 | if(!fClusters[itb]) continue; | |
116 | //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb)); | |
117 | delete fClusters[itb]; | |
118 | fClusters[itb] = 0x0; | |
119 | } | |
e4f2f73d | 120 | } |
121 | ||
122 | //____________________________________________________________________ | |
123 | void AliTRDseedV1::Copy(TObject &ref) const | |
124 | { | |
125 | // | |
126 | // Copy function | |
127 | // | |
128 | ||
29b87567 | 129 | //AliInfo(""); |
130 | AliTRDseedV1 &target = (AliTRDseedV1 &)ref; | |
131 | ||
132 | target.fPlane = fPlane; | |
133 | target.fMom = fMom; | |
134 | target.fSnp = fSnp; | |
135 | target.fTgl = fTgl; | |
136 | target.fdX = fdX; | |
137 | target.fReconstructor = fReconstructor; | |
138 | ||
139 | for(int islice=0; islice < knSlices; islice++) target.fdEdx[islice] = fdEdx[islice]; | |
140 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) target.fProb[ispec] = fProb[ispec]; | |
141 | ||
142 | AliTRDseed::Copy(target); | |
e4f2f73d | 143 | } |
144 | ||
0906e73e | 145 | |
146 | //____________________________________________________________ | |
f3d3af1b | 147 | Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track) |
0906e73e | 148 | { |
149 | // Initialize this tracklet using the track information | |
150 | // | |
151 | // Parameters: | |
152 | // track - the TRD track used to initialize the tracklet | |
153 | // | |
154 | // Detailed description | |
155 | // The function sets the starting point and direction of the | |
156 | // tracklet according to the information from the TRD track. | |
157 | // | |
158 | // Caution | |
159 | // The TRD track has to be propagated to the beginning of the | |
160 | // chamber where the tracklet will be constructed | |
161 | // | |
162 | ||
29b87567 | 163 | Double_t y, z; |
164 | if(!track->GetProlongation(fX0, y, z)) return kFALSE; | |
165 | fYref[0] = y; | |
166 | fYref[1] = track->GetSnp()/(1. - track->GetSnp()*track->GetSnp()); | |
167 | fZref[0] = z; | |
168 | fZref[1] = track->GetTgl(); | |
0906e73e | 169 | |
29b87567 | 170 | //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()); |
171 | return kTRUE; | |
0906e73e | 172 | } |
173 | ||
bcb6fb78 | 174 | |
175 | //____________________________________________________________________ | |
176 | void AliTRDseedV1::CookdEdx(Int_t nslices) | |
177 | { | |
178 | // Calculates average dE/dx for all slices and store them in the internal array fdEdx. | |
179 | // | |
180 | // Parameters: | |
181 | // nslices : number of slices for which dE/dx should be calculated | |
182 | // Output: | |
183 | // store results in the internal array fdEdx. This can be accessed with the method | |
184 | // AliTRDseedV1::GetdEdx() | |
185 | // | |
186 | // Detailed description | |
187 | // Calculates average dE/dx for all slices. Depending on the PID methode | |
188 | // the number of slices can be 3 (LQ) or 8(NN). | |
189 | // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) i.e. | |
190 | // | |
191 | // dQ/dl = qc/(dx * sqrt(1 + dy/dx^2 + dz/dx^2)) | |
192 | // | |
193 | // The following effects are included in the calculation: | |
194 | // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice) | |
195 | // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing()) | |
196 | // 3. cluster size | |
197 | // | |
198 | ||
29b87567 | 199 | Int_t nclusters[knSlices]; |
200 | for(int i=0; i<knSlices; i++){ | |
201 | fdEdx[i] = 0.; | |
202 | nclusters[i] = 0; | |
203 | } | |
204 | Float_t clength = (/*.5 * */AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
205 | ||
206 | AliTRDcluster *cluster = 0x0; | |
207 | for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){ | |
208 | if(!(cluster = fClusters[ic])) continue; | |
209 | Float_t x = cluster->GetX(); | |
210 | ||
211 | // Filter clusters for dE/dx calculation | |
212 | ||
213 | // 1.consider calibration effects for slice determination | |
214 | Int_t slice; | |
215 | if(cluster->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / clength); | |
216 | else slice = x < fX0 ? 0 : nslices-1; | |
217 | ||
218 | // 2. take sharing into account | |
219 | Float_t w = cluster->IsShared() ? .5 : 1.; | |
220 | ||
221 | // 3. take into account large clusters TODO | |
222 | //w *= c->GetNPads() > 3 ? .8 : 1.; | |
223 | ||
224 | //CHECK !!! | |
225 | fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic]; | |
226 | nclusters[slice]++; | |
227 | } // End of loop over clusters | |
228 | ||
cd40b287 | 229 | //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){ |
230 | if(nslices == AliTRDReconstructor::kLQslices){ | |
29b87567 | 231 | // calculate mean charge per slice (only LQ PID) |
232 | for(int is=0; is<nslices; is++){ | |
233 | if(nclusters[is]) fdEdx[is] /= nclusters[is]; | |
234 | } | |
235 | } | |
bcb6fb78 | 236 | } |
237 | ||
b83573da | 238 | |
bcb6fb78 | 239 | //____________________________________________________________________ |
240 | Float_t AliTRDseedV1::GetdQdl(Int_t ic) const | |
241 | { | |
29b87567 | 242 | return fClusters[ic] ? TMath::Abs(fClusters[ic]->GetQ()) /fdX / TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]) : 0.; |
bcb6fb78 | 243 | } |
244 | ||
0906e73e | 245 | //____________________________________________________________________ |
246 | Double_t* AliTRDseedV1::GetProbability() | |
247 | { | |
248 | // Fill probability array for tracklet from the DB. | |
249 | // | |
250 | // Parameters | |
251 | // | |
252 | // Output | |
253 | // returns pointer to the probability array and 0x0 if missing DB access | |
254 | // | |
255 | // Detailed description | |
256 | ||
29b87567 | 257 | |
258 | // retrive calibration db | |
0906e73e | 259 | AliTRDcalibDB *calibration = AliTRDcalibDB::Instance(); |
260 | if (!calibration) { | |
261 | AliError("No access to calibration data"); | |
262 | return 0x0; | |
263 | } | |
264 | ||
3a039a31 | 265 | if (!fReconstructor) { |
266 | AliError("Reconstructor not set."); | |
4ba1d6ae | 267 | return 0x0; |
268 | } | |
269 | ||
0906e73e | 270 | // Retrieve the CDB container class with the parametric detector response |
3a039a31 | 271 | const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod()); |
0906e73e | 272 | if (!pd) { |
273 | AliError("No access to AliTRDCalPID object"); | |
274 | return 0x0; | |
275 | } | |
29b87567 | 276 | //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName())); |
10f75631 | 277 | |
29b87567 | 278 | // calculate tracklet length TO DO |
0906e73e | 279 | Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); |
280 | /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane])); | |
281 | ||
282 | //calculate dE/dx | |
3a039a31 | 283 | CookdEdx(fReconstructor->GetNdEdxSlices()); |
0906e73e | 284 | |
285 | // Sets the a priori probabilities | |
286 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) { | |
287 | fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, fPlane); | |
288 | } | |
289 | ||
29b87567 | 290 | return &fProb[0]; |
0906e73e | 291 | } |
292 | ||
e4f2f73d | 293 | //____________________________________________________________________ |
294 | Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const | |
295 | { | |
296 | // | |
297 | // Returns a quality measurement of the current seed | |
298 | // | |
299 | ||
29b87567 | 300 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; |
301 | return | |
302 | .5 * TMath::Abs(18.0 - fN2) | |
303 | + 10.* TMath::Abs(fYfit[1] - fYref[1]) | |
304 | + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr) | |
305 | + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength; | |
e4f2f73d | 306 | } |
307 | ||
0906e73e | 308 | //____________________________________________________________________ |
309 | void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const | |
310 | { | |
311 | // Computes covariance in the y-z plane at radial point x | |
312 | ||
29b87567 | 313 | Int_t ic = 0; while (!fClusters[ic]) ic++; |
eb38ed55 | 314 | AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance(); |
29b87567 | 315 | Double_t exB = fCalib->GetOmegaTau(fCalib->GetVdriftAverage(fClusters[ic]->GetDetector()), -AliTracker::GetBz()*0.1); |
eb38ed55 | 316 | |
29b87567 | 317 | Double_t sy2 = fSigmaY2*fSigmaY2 + .2*(fYfit[1]-exB)*(fYfit[1]-exB); |
318 | Double_t sz2 = fPadLength/12.; | |
0906e73e | 319 | |
eb38ed55 | 320 | |
29b87567 | 321 | //printf("Yfit[1] %f sy20 %f SigmaY2 %f\n", fYfit[1], sy20, fSigmaY2); |
0906e73e | 322 | |
29b87567 | 323 | cov[0] = sy2; |
324 | cov[1] = fTilt*(sy2-sz2); | |
325 | cov[2] = sz2; | |
3a039a31 | 326 | |
327 | // insert systematic uncertainties calibration and misalignment | |
328 | Double_t sys[15]; | |
329 | fReconstructor->GetRecoParam()->GetSysCovMatrix(sys); | |
330 | cov[0] += (sys[0]*sys[0]); | |
331 | cov[2] += (sys[1]*sys[1]); | |
0906e73e | 332 | } |
333 | ||
0906e73e | 334 | |
335 | //____________________________________________________________________ | |
29b87567 | 336 | void AliTRDseedV1::SetOwner() |
0906e73e | 337 | { |
29b87567 | 338 | //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO")); |
339 | ||
340 | if(TestBit(kOwner)) return; | |
341 | for(int ic=0; ic<knTimebins; ic++){ | |
342 | if(!fClusters[ic]) continue; | |
343 | fClusters[ic] = new AliTRDcluster(*fClusters[ic]); | |
344 | } | |
345 | SetBit(kOwner); | |
0906e73e | 346 | } |
347 | ||
e4f2f73d | 348 | //____________________________________________________________________ |
eb38ed55 | 349 | Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c) |
e4f2f73d | 350 | { |
351 | // | |
352 | // Iterative process to register clusters to the seed. | |
353 | // In iteration 0 we try only one pad-row and if quality not | |
354 | // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows) | |
355 | // | |
29b87567 | 356 | // debug level 7 |
357 | // | |
358 | ||
359 | if(!fReconstructor->GetRecoParam() ){ | |
360 | AliError("Seed can not be used without a valid RecoParam."); | |
361 | return kFALSE; | |
362 | } | |
363 | ||
364 | AliTRDchamberTimeBin *layer = 0x0; | |
365 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7 && c){ | |
366 | TClonesArray clusters("AliTRDcluster", 24); | |
367 | clusters.SetOwner(kTRUE); | |
368 | AliTRDcluster *cc = 0x0; | |
369 | Int_t det=-1, ncl, ncls = 0; | |
370 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
371 | if(!(layer = chamber->GetTB(iTime))) continue; | |
372 | if(!(ncl = Int_t(*layer))) continue; | |
373 | for(int ic=0; ic<ncl; ic++){ | |
374 | cc = (*layer)[ic]; | |
375 | det = cc->GetDetector(); | |
376 | new(clusters[ncls++]) AliTRDcluster(*cc); | |
377 | } | |
378 | } | |
379 | AliInfo(Form("N clusters[%d] = %d", fPlane, ncls)); | |
380 | ||
381 | Int_t ref = c ? 1 : 0; | |
382 | TTreeSRedirector &cstreamer = *AliTRDtrackerV1::DebugStreamer(); | |
383 | cstreamer << "AttachClustersIter" | |
384 | << "det=" << det | |
385 | << "ref=" << ref | |
386 | << "clusters.=" << &clusters | |
387 | << "tracklet.=" << this | |
388 | << "cl.=" << c | |
389 | << "\n"; | |
390 | } | |
391 | ||
392 | Float_t tquality; | |
393 | Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y(); | |
394 | Double_t kroadz = fPadLength * .5 + 1.; | |
395 | ||
396 | // initialize configuration parameters | |
397 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; | |
398 | Int_t niter = kZcorr ? 1 : 2; | |
399 | ||
400 | Double_t yexp, zexp; | |
401 | Int_t ncl = 0; | |
402 | // start seed update | |
403 | for (Int_t iter = 0; iter < niter; iter++) { | |
404 | ncl = 0; | |
405 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
406 | if(!(layer = chamber->GetTB(iTime))) continue; | |
407 | if(!Int_t(*layer)) continue; | |
408 | ||
409 | // define searching configuration | |
410 | Double_t dxlayer = layer->GetX() - fX0; | |
411 | if(c){ | |
412 | zexp = c->GetZ(); | |
413 | //Try 2 pad-rows in second iteration | |
414 | if (iter > 0) { | |
415 | zexp = fZref[0] + fZref[1] * dxlayer - zcorr; | |
416 | if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5; | |
417 | if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5; | |
418 | } | |
419 | } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.); | |
420 | yexp = fYref[0] + fYref[1] * dxlayer - zcorr; | |
421 | ||
422 | // Get and register cluster | |
423 | Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz); | |
424 | if (index < 0) continue; | |
425 | AliTRDcluster *cl = (*layer)[index]; | |
426 | ||
427 | fIndexes[iTime] = layer->GetGlobalIndex(index); | |
428 | fClusters[iTime] = cl; | |
429 | fY[iTime] = cl->GetY(); | |
430 | fZ[iTime] = cl->GetZ(); | |
431 | ncl++; | |
432 | } | |
433 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fPlane, ncl)); | |
434 | ||
435 | if(ncl>1){ | |
436 | // calculate length of the time bin (calibration aware) | |
437 | Int_t irp = 0; Float_t x[2]; Int_t tb[2]; | |
438 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
439 | if(!fClusters[iTime]) continue; | |
440 | x[irp] = fClusters[iTime]->GetX(); | |
441 | tb[irp] = iTime; | |
442 | irp++; | |
443 | if(irp==2) break; | |
444 | } | |
445 | fdX = (x[1] - x[0]) / (tb[0] - tb[1]); | |
446 | ||
447 | // update X0 from the clusters (calibration/alignment aware) | |
448 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
449 | if(!(layer = chamber->GetTB(iTime))) continue; | |
450 | if(!layer->IsT0()) continue; | |
451 | if(fClusters[iTime]){ | |
452 | fX0 = fClusters[iTime]->GetX(); | |
453 | break; | |
454 | } else { // we have to infere the position of the anode wire from the other clusters | |
455 | for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) { | |
456 | if(!fClusters[jTime]) continue; | |
457 | fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime); | |
458 | } | |
459 | break; | |
460 | } | |
461 | } | |
462 | ||
463 | // update YZ reference point | |
464 | // TODO | |
465 | ||
466 | // update x reference positions (calibration/alignment aware) | |
467 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
468 | if(!fClusters[iTime]) continue; | |
469 | fX[iTime] = fClusters[iTime]->GetX() - fX0; | |
470 | } | |
471 | ||
472 | AliTRDseed::Update(); | |
473 | } | |
474 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fPlane, fN2)); | |
475 | ||
476 | if(IsOK()){ | |
477 | tquality = GetQuality(kZcorr); | |
478 | if(tquality < quality) break; | |
479 | else quality = tquality; | |
480 | } | |
481 | kroadz *= 2.; | |
482 | } // Loop: iter | |
483 | if (!IsOK()) return kFALSE; | |
484 | ||
804bb02e | 485 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels(); |
29b87567 | 486 | UpdateUsed(); |
487 | return kTRUE; | |
e4f2f73d | 488 | } |
489 | ||
490 | //____________________________________________________________________ | |
eb38ed55 | 491 | Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber |
29b87567 | 492 | ,Bool_t kZcorr) |
e4f2f73d | 493 | { |
494 | // | |
495 | // Projective algorithm to attach clusters to seeding tracklets | |
496 | // | |
497 | // Parameters | |
498 | // | |
499 | // Output | |
500 | // | |
501 | // Detailed description | |
502 | // 1. Collapse x coordinate for the full detector plane | |
503 | // 2. truncated mean on y (r-phi) direction | |
504 | // 3. purge clusters | |
505 | // 4. truncated mean on z direction | |
506 | // 5. purge clusters | |
507 | // 6. fit tracklet | |
508 | // | |
509 | ||
29b87567 | 510 | if(!fReconstructor->GetRecoParam() ){ |
511 | AliError("Seed can not be used without a valid RecoParam."); | |
512 | return kFALSE; | |
513 | } | |
514 | ||
515 | const Int_t kClusterCandidates = 2 * knTimebins; | |
516 | ||
517 | //define roads | |
518 | Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y(); | |
519 | Double_t kroadz = fPadLength * 1.5 + 1.; | |
520 | // correction to y for the tilting angle | |
521 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; | |
522 | ||
523 | // working variables | |
524 | AliTRDcluster *clusters[kClusterCandidates]; | |
525 | Double_t cond[4], yexp[knTimebins], zexp[knTimebins], | |
526 | yres[kClusterCandidates], zres[kClusterCandidates]; | |
527 | Int_t ncl, *index = 0x0, tboundary[knTimebins]; | |
528 | ||
529 | // Do cluster projection | |
530 | AliTRDchamberTimeBin *layer = 0x0; | |
531 | Int_t nYclusters = 0; Bool_t kEXIT = kFALSE; | |
532 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
533 | if(!(layer = chamber->GetTB(iTime))) continue; | |
534 | if(!Int_t(*layer)) continue; | |
535 | ||
536 | fX[iTime] = layer->GetX() - fX0; | |
537 | zexp[iTime] = fZref[0] + fZref[1] * fX[iTime]; | |
538 | yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr; | |
539 | ||
540 | // build condition and process clusters | |
541 | cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady; | |
542 | cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz; | |
543 | layer->GetClusters(cond, index, ncl); | |
544 | for(Int_t ic = 0; ic<ncl; ic++){ | |
545 | AliTRDcluster *c = layer->GetCluster(index[ic]); | |
546 | clusters[nYclusters] = c; | |
547 | yres[nYclusters++] = c->GetY() - yexp[iTime]; | |
548 | if(nYclusters >= kClusterCandidates) { | |
549 | AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates)); | |
550 | kEXIT = kTRUE; | |
551 | break; | |
552 | } | |
553 | } | |
554 | tboundary[iTime] = nYclusters; | |
555 | if(kEXIT) break; | |
556 | } | |
557 | ||
558 | // Evaluate truncated mean on the y direction | |
559 | Double_t mean, sigma; | |
560 | AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2); | |
561 | // purge cluster candidates | |
562 | Int_t nZclusters = 0; | |
563 | for(Int_t ic = 0; ic<nYclusters; ic++){ | |
564 | if(yres[ic] - mean > 4. * sigma){ | |
565 | clusters[ic] = 0x0; | |
566 | continue; | |
567 | } | |
568 | zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()]; | |
569 | } | |
570 | ||
571 | // Evaluate truncated mean on the z direction | |
572 | AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2); | |
573 | // purge cluster candidates | |
574 | for(Int_t ic = 0; ic<nZclusters; ic++){ | |
575 | if(zres[ic] - mean > 4. * sigma){ | |
576 | clusters[ic] = 0x0; | |
577 | continue; | |
578 | } | |
579 | } | |
580 | ||
581 | ||
582 | // Select only one cluster/TimeBin | |
583 | Int_t lastCluster = 0; | |
584 | fN2 = 0; | |
585 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
586 | ncl = tboundary[iTime] - lastCluster; | |
587 | if(!ncl) continue; | |
588 | Int_t iptr = lastCluster; | |
589 | if(ncl > 1){ | |
590 | Float_t dold = 9999.; | |
591 | for(int ic=lastCluster; ic<tboundary[iTime]; ic++){ | |
592 | if(!clusters[ic]) continue; | |
593 | Float_t y = yexp[iTime] - clusters[ic]->GetY(); | |
594 | Float_t z = zexp[iTime] - clusters[ic]->GetZ(); | |
595 | Float_t d = y * y + z * z; | |
596 | if(d > dold) continue; | |
597 | dold = d; | |
598 | iptr = ic; | |
599 | } | |
600 | } | |
601 | fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr); | |
602 | fClusters[iTime] = clusters[iptr]; | |
603 | fY[iTime] = clusters[iptr]->GetY(); | |
604 | fZ[iTime] = clusters[iptr]->GetZ(); | |
605 | lastCluster = tboundary[iTime]; | |
606 | fN2++; | |
607 | } | |
608 | ||
609 | // number of minimum numbers of clusters expected for the tracklet | |
610 | Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins()); | |
e4f2f73d | 611 | if (fN2 < kClmin){ |
29b87567 | 612 | AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin)); |
e4f2f73d | 613 | fN2 = 0; |
614 | return kFALSE; | |
615 | } | |
0906e73e | 616 | |
29b87567 | 617 | // update used clusters |
618 | fNUsed = 0; | |
619 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
620 | if(!fClusters[iTime]) continue; | |
621 | if((fClusters[iTime]->IsUsed())) fNUsed++; | |
622 | } | |
0906e73e | 623 | |
624 | if (fN2-fNUsed < kClmin){ | |
29b87567 | 625 | AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2)); |
0906e73e | 626 | fN2 = 0; |
627 | return kFALSE; | |
628 | } | |
29b87567 | 629 | |
630 | return kTRUE; | |
e4f2f73d | 631 | } |
632 | ||
633 | //____________________________________________________________________ | |
d2b9977a | 634 | Bool_t AliTRDseedV1::Fit(Bool_t tilt) |
e4f2f73d | 635 | { |
636 | // | |
637 | // Linear fit of the tracklet | |
638 | // | |
639 | // Parameters : | |
640 | // | |
641 | // Output : | |
642 | // True if successful | |
643 | // | |
644 | // Detailed description | |
645 | // 2. Check if tracklet crosses pad row boundary | |
646 | // 1. Calculate residuals in the y (r-phi) direction | |
647 | // 3. Do a Least Square Fit to the data | |
648 | // | |
649 | ||
29b87567 | 650 | const Int_t kClmin = 8; |
651 | const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins(); | |
652 | AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ; | |
653 | ||
654 | // convertion factor from square to gauss distribution for sigma | |
655 | Double_t convert = 1./TMath::Sqrt(12.); | |
656 | ||
657 | // book cluster information | |
658 | Double_t xc[knTimebins+1], yc[knTimebins], zc[knTimebins+1], sy[knTimebins], sz[knTimebins+1]; | |
659 | Int_t zRow[knTimebins]; | |
660 | AliTRDcluster *c = 0x0; | |
661 | Int_t nc = 0; | |
662 | for (Int_t ic=0; ic<kNtb; ic++) { | |
663 | zRow[ic] = -1; | |
664 | xc[ic] = -1.; | |
665 | yc[ic] = 999.; | |
666 | zc[ic] = 999.; | |
667 | sy[ic] = 0.; | |
668 | sz[ic] = 0.; | |
669 | if(!(c = fClusters[ic])) continue; | |
670 | if(!c->IsInChamber()) continue; | |
671 | Float_t w = 1.; | |
672 | if(c->GetNPads()>4) w = .5; | |
673 | if(c->GetNPads()>5) w = .2; | |
674 | zRow[nc] = c->GetPadRow(); | |
d2b9977a | 675 | xc[nc] = c->GetX() - fX0; |
29b87567 | 676 | yc[nc] = c->GetY(); |
677 | zc[nc] = c->GetZ(); | |
2eafa911 | 678 | sy[nc] = w; // all clusters have the same sigma |
679 | sz[nc] = fPadLength*convert; | |
680 | fitterZ.AddPoint(&xc[nc], zc[nc], sz[nc]); | |
29b87567 | 681 | nc++; |
682 | } | |
47d5d320 | 683 | // to few clusters |
29b87567 | 684 | if (nc < kClmin) return kFALSE; |
685 | ||
e4f2f73d | 686 | |
29b87567 | 687 | Int_t zN[2*35]; |
47d5d320 | 688 | Int_t nz = AliTRDtrackerV1::Freq(nc, zRow, zN, kFALSE); |
29b87567 | 689 | // more than one pad row crossing |
690 | if(nz>2) return kFALSE; | |
691 | ||
692 | // estimate reference parameter at average x | |
693 | Double_t y0 = fYref[0]; | |
694 | Double_t dydx = fYref[1]; | |
695 | Double_t dzdx = fZref[1]; | |
696 | zc[nc] = fZref[0]; | |
697 | ||
698 | // determine z offset of the fit | |
699 | Int_t nchanges = 0, nCross = 0; | |
700 | if(nz==2){ // tracklet is crossing pad row | |
701 | // Find the break time allowing one chage on pad-rows | |
702 | // with maximal number of accepted clusters | |
703 | Int_t padRef = zRow[0]; | |
704 | for (Int_t ic=1; ic<nc; ic++) { | |
705 | if(zRow[ic] == padRef) continue; | |
706 | ||
707 | // debug | |
708 | if(zRow[ic-1] == zRow[ic]){ | |
709 | printf("ERROR in pad row change!!!\n"); | |
710 | } | |
711 | ||
712 | // evaluate parameters of the crossing point | |
713 | Float_t sx = (xc[ic-1] - xc[ic])*convert; | |
714 | xc[nc] = .5 * (xc[ic-1] + xc[ic]); | |
715 | zc[nc] = .5 * (zc[ic-1] + zc[ic]); | |
716 | sz[nc] = TMath::Max(dzdx * sx, .01); | |
717 | dzdx = zc[ic-1] > zc[ic] ? 1. : -1.; | |
718 | padRef = zRow[ic]; | |
719 | nCross = ic; | |
720 | nchanges++; | |
721 | } | |
722 | } | |
723 | ||
724 | // condition on nCross and reset nchanges TODO | |
725 | ||
726 | if(nchanges==1){ | |
727 | if(dzdx * fZref[1] < 0.){ | |
728 | AliInfo("tracklet direction does not correspond to the track direction. TODO."); | |
729 | } | |
730 | SetBit(kRowCross, kTRUE); // mark pad row crossing | |
731 | fCross[0] = xc[nc]; fCross[2] = zc[nc]; fCross[3] = sz[nc]; | |
732 | fitterZ.AddPoint(&xc[nc], zc[nc], sz[nc]); | |
733 | fitterZ.Eval(); | |
734 | dzdx = fZref[1]; // we don't trust Parameter[1] ??; | |
735 | zc[nc] = fitterZ.GetFunctionParameter(0); | |
736 | } else if(nchanges > 1){ // debug | |
737 | AliInfo("ERROR in n changes!!!"); | |
738 | return kFALSE; | |
739 | } | |
740 | ||
741 | ||
742 | // estimate deviation from reference direction | |
743 | dzdx *= fTilt; | |
744 | for (Int_t ic=0; ic<nc; ic++) { | |
d2b9977a | 745 | yc[ic] -= (y0 + xc[ic]*dydx); |
746 | if(tilt) yc[ic] -= (xc[ic]*dzdx + fTilt * (zc[ic] - zc[nc])); | |
29b87567 | 747 | fitterY.AddPoint(&xc[ic], yc[ic], sy[ic]); |
748 | } | |
749 | fitterY.Eval(); | |
750 | fYfit[0] = y0+fitterY.GetFunctionParameter(0); | |
751 | fYfit[1] = dydx+fitterY.GetFunctionParameter(1); | |
d2b9977a | 752 | |
29b87567 | 753 | if(nchanges) fCross[1] = fYfit[0] + fCross[0] * fYfit[1]; |
e4f2f73d | 754 | |
47d5d320 | 755 | // printf("\nnz = %d\n", nz); |
756 | // for(int ic=0; ic<35; ic++) printf("%d row[%d]\n", ic, zRow[ic]); | |
757 | // | |
758 | // for(int ic=0; ic<nz; ic++) printf("%d n[%d]\n", ic, zN[ic]); | |
e4f2f73d | 759 | |
29b87567 | 760 | return kTRUE; |
e4f2f73d | 761 | } |
762 | ||
47d5d320 | 763 | //___________________________________________________________________ |
764 | void AliTRDseedV1::Draw(Option_t*) | |
765 | { | |
766 | } | |
e4f2f73d | 767 | |
768 | //___________________________________________________________________ | |
47d5d320 | 769 | void AliTRDseedV1::Print(Option_t*) const |
e4f2f73d | 770 | { |
771 | // | |
772 | // Printing the seedstatus | |
773 | // | |
774 | ||
29b87567 | 775 | printf("Seed status :\n"); |
776 | printf(" fTilt = %f\n", fTilt); | |
777 | printf(" fPadLength = %f\n", fPadLength); | |
778 | printf(" fX0 = %f\n", fX0); | |
779 | for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++) { | |
e4f2f73d | 780 | const Char_t *isUsable = fUsable[ic]?"Yes":"No"; |
29b87567 | 781 | printf(" %d X[%f] Y[%f] Z[%f] Indexes[%d] clusters[%p] usable[%s]\n" |
e4f2f73d | 782 | , ic |
783 | , fX[ic] | |
784 | , fY[ic] | |
785 | , fZ[ic] | |
786 | , fIndexes[ic] | |
0906e73e | 787 | , ((void*) fClusters[ic]) |
e4f2f73d | 788 | , isUsable); |
789 | } | |
790 | ||
29b87567 | 791 | printf(" fYref[0] =%f fYref[1] =%f\n", fYref[0], fYref[1]); |
792 | printf(" fZref[0] =%f fZref[1] =%f\n", fZref[0], fZref[1]); | |
793 | printf(" fYfit[0] =%f fYfit[1] =%f\n", fYfit[0], fYfit[1]); | |
794 | printf(" fYfitR[0]=%f fYfitR[1]=%f\n", fYfitR[0], fYfitR[1]); | |
795 | printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]); | |
796 | printf(" fZfitR[0]=%f fZfitR[1]=%f\n", fZfitR[0], fZfitR[1]); | |
797 | printf(" fSigmaY =%f\n", fSigmaY); | |
798 | printf(" fSigmaY2=%f\n", fSigmaY2); | |
799 | printf(" fMeanz =%f\n", fMeanz); | |
800 | printf(" fZProb =%f\n", fZProb); | |
801 | printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]); | |
802 | printf(" fN =%d\n", fN); | |
803 | printf(" fN2 =%d (>8 isOK)\n",fN2); | |
804 | printf(" fNUsed =%d\n", fNUsed); | |
805 | printf(" fFreq =%d\n", fFreq); | |
806 | printf(" fNChange=%d\n", fNChange); | |
807 | printf(" fMPads =%f\n", fMPads); | |
808 | ||
809 | printf(" fC =%f\n", fC); | |
810 | printf(" fCC =%f\n",fCC); | |
811 | printf(" fChi2 =%f\n", fChi2); | |
812 | printf(" fChi2Z =%f\n", fChi2Z); | |
e4f2f73d | 813 | } |
47d5d320 | 814 |