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f7336fa3 | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
f7336fa3 | 17 | |
18 | /////////////////////////////////////////////////////////////////////////////// | |
19 | // // | |
20 | // TRD cluster finder for the slow simulator. | |
21 | // // | |
22 | /////////////////////////////////////////////////////////////////////////////// | |
23 | ||
24 | #include <TF1.h> | |
94de3818 | 25 | #include <TTree.h> |
793ff80c | 26 | #include <TH1.h> |
a819a5f7 | 27 | #include <TFile.h> |
f7336fa3 | 28 | |
793ff80c | 29 | #include "AliRun.h" |
88cb7938 | 30 | #include "AliRunLoader.h" |
31 | #include "AliLoader.h" | |
793ff80c | 32 | |
f7336fa3 | 33 | #include "AliTRDclusterizerV1.h" |
34 | #include "AliTRDmatrix.h" | |
35 | #include "AliTRDgeometry.h" | |
6f1e466d | 36 | #include "AliTRDdataArrayF.h" |
793ff80c | 37 | #include "AliTRDdataArrayI.h" |
38 | #include "AliTRDdigitsManager.h" | |
17b26de4 | 39 | #include "AliTRDparameter.h" |
f7336fa3 | 40 | |
41 | ClassImp(AliTRDclusterizerV1) | |
42 | ||
43 | //_____________________________________________________________________________ | |
44 | AliTRDclusterizerV1::AliTRDclusterizerV1():AliTRDclusterizer() | |
45 | { | |
46 | // | |
47 | // AliTRDclusterizerV1 default constructor | |
48 | // | |
49 | ||
17b26de4 | 50 | fDigitsManager = 0; |
db30bf0f | 51 | |
f7336fa3 | 52 | } |
53 | ||
54 | //_____________________________________________________________________________ | |
55 | AliTRDclusterizerV1::AliTRDclusterizerV1(const Text_t* name, const Text_t* title) | |
56 | :AliTRDclusterizer(name,title) | |
57 | { | |
58 | // | |
59 | // AliTRDclusterizerV1 default constructor | |
60 | // | |
61 | ||
6f1e466d | 62 | fDigitsManager = new AliTRDdigitsManager(); |
17b26de4 | 63 | fDigitsManager->CreateArrays(); |
f7336fa3 | 64 | |
65 | } | |
66 | ||
8230f242 | 67 | //_____________________________________________________________________________ |
dd9a6ee3 | 68 | AliTRDclusterizerV1::AliTRDclusterizerV1(const AliTRDclusterizerV1 &c) |
73ae7b59 | 69 | :AliTRDclusterizer(c) |
8230f242 | 70 | { |
71 | // | |
72 | // AliTRDclusterizerV1 copy constructor | |
73 | // | |
74 | ||
dd9a6ee3 | 75 | ((AliTRDclusterizerV1 &) c).Copy(*this); |
8230f242 | 76 | |
77 | } | |
78 | ||
f7336fa3 | 79 | //_____________________________________________________________________________ |
80 | AliTRDclusterizerV1::~AliTRDclusterizerV1() | |
81 | { | |
8230f242 | 82 | // |
83 | // AliTRDclusterizerV1 destructor | |
84 | // | |
f7336fa3 | 85 | |
6f1e466d | 86 | if (fDigitsManager) { |
87 | delete fDigitsManager; | |
abaf1f1d | 88 | fDigitsManager = NULL; |
f7336fa3 | 89 | } |
90 | ||
91 | } | |
92 | ||
dd9a6ee3 | 93 | //_____________________________________________________________________________ |
94 | AliTRDclusterizerV1 &AliTRDclusterizerV1::operator=(const AliTRDclusterizerV1 &c) | |
95 | { | |
96 | // | |
97 | // Assignment operator | |
98 | // | |
99 | ||
100 | if (this != &c) ((AliTRDclusterizerV1 &) c).Copy(*this); | |
101 | return *this; | |
102 | ||
103 | } | |
104 | ||
8230f242 | 105 | //_____________________________________________________________________________ |
e0d47c25 | 106 | void AliTRDclusterizerV1::Copy(TObject &c) const |
8230f242 | 107 | { |
108 | // | |
109 | // Copy function | |
110 | // | |
111 | ||
17b26de4 | 112 | ((AliTRDclusterizerV1 &) c).fDigitsManager = 0; |
8230f242 | 113 | |
114 | AliTRDclusterizer::Copy(c); | |
115 | ||
116 | } | |
117 | ||
f7336fa3 | 118 | //_____________________________________________________________________________ |
119 | Bool_t AliTRDclusterizerV1::ReadDigits() | |
120 | { | |
121 | // | |
122 | // Reads the digits arrays from the input aliroot file | |
123 | // | |
124 | ||
88cb7938 | 125 | if (!fRunLoader) { |
17b26de4 | 126 | printf("<AliTRDclusterizerV1::ReadDigits> "); |
f7336fa3 | 127 | printf("No input file open\n"); |
128 | return kFALSE; | |
129 | } | |
88cb7938 | 130 | AliLoader* loader = fRunLoader->GetLoader("TRDLoader"); |
131 | if (!loader->TreeD()) loader->LoadDigits(); | |
abaf1f1d | 132 | |
f7336fa3 | 133 | // Read in the digit arrays |
88cb7938 | 134 | return (fDigitsManager->ReadDigits(loader->TreeD())); |
f7336fa3 | 135 | |
136 | } | |
137 | ||
138 | //_____________________________________________________________________________ | |
793ff80c | 139 | Bool_t AliTRDclusterizerV1::MakeClusters() |
f7336fa3 | 140 | { |
141 | // | |
142 | // Generates the cluster. | |
143 | // | |
144 | ||
145 | Int_t row, col, time; | |
146 | ||
bdbb05bb | 147 | /* |
3e1a3ad8 | 148 | if (fTRD->IsVersion() != 1) { |
17b26de4 | 149 | printf("<AliTRDclusterizerV1::MakeCluster> "); |
f7336fa3 | 150 | printf("TRD must be version 1 (slow simulator).\n"); |
151 | return kFALSE; | |
152 | } | |
bdbb05bb | 153 | */ |
f7336fa3 | 154 | |
155 | // Get the geometry | |
bdbb05bb | 156 | AliTRDgeometry *geo = AliTRDgeometry::GetGeometry(fRunLoader); |
f7336fa3 | 157 | |
17b26de4 | 158 | // Create a default parameter class if none is defined |
159 | if (!fPar) { | |
160 | fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter"); | |
5443e65e | 161 | printf("<AliTRDclusterizerV1::MakeCluster> "); |
162 | printf("Create the default parameter object.\n"); | |
17b26de4 | 163 | } |
164 | ||
165 | Float_t timeBinSize = fPar->GetTimeBinSize(); | |
a819a5f7 | 166 | // Half of ampl.region |
167 | const Float_t kAmWidth = AliTRDgeometry::AmThick()/2.; | |
168 | ||
17b26de4 | 169 | Float_t omegaTau = fPar->GetOmegaTau(); |
47517f42 | 170 | if (fVerbose > 0) { |
17b26de4 | 171 | printf("<AliTRDclusterizerV1::MakeCluster> "); |
47517f42 | 172 | printf("OmegaTau = %f \n",omegaTau); |
17b26de4 | 173 | printf("<AliTRDclusterizerV1::MakeCluster> "); |
47517f42 | 174 | printf("Start creating clusters.\n"); |
175 | } | |
f7336fa3 | 176 | |
8230f242 | 177 | AliTRDdataArrayI *digits; |
793ff80c | 178 | AliTRDdataArrayI *track0; |
179 | AliTRDdataArrayI *track1; | |
180 | AliTRDdataArrayI *track2; | |
f7336fa3 | 181 | |
3e1a3ad8 | 182 | // Threshold value for the maximum |
17b26de4 | 183 | Int_t maxThresh = fPar->GetClusMaxThresh(); |
3e1a3ad8 | 184 | // Threshold value for the digit signal |
17b26de4 | 185 | Int_t sigThresh = fPar->GetClusSigThresh(); |
f7336fa3 | 186 | |
187 | // Iteration limit for unfolding procedure | |
8230f242 | 188 | const Float_t kEpsilon = 0.01; |
f7336fa3 | 189 | |
8230f242 | 190 | const Int_t kNclus = 3; |
191 | const Int_t kNsig = 5; | |
3e1a3ad8 | 192 | const Int_t kNtrack = 3 * kNclus; |
193 | ||
db30bf0f | 194 | Int_t iType = 0; |
195 | Int_t iUnfold = 0; | |
196 | ||
197 | Float_t ratioLeft = 1.0; | |
198 | Float_t ratioRight = 1.0; | |
199 | ||
3e1a3ad8 | 200 | Float_t padSignal[kNsig]; |
201 | Float_t clusterSignal[kNclus]; | |
202 | Float_t clusterPads[kNclus]; | |
203 | Int_t clusterDigit[kNclus]; | |
204 | Int_t clusterTracks[kNtrack]; | |
f7336fa3 | 205 | |
206 | Int_t chamBeg = 0; | |
793ff80c | 207 | Int_t chamEnd = AliTRDgeometry::Ncham(); |
f7336fa3 | 208 | Int_t planBeg = 0; |
793ff80c | 209 | Int_t planEnd = AliTRDgeometry::Nplan(); |
f7336fa3 | 210 | Int_t sectBeg = 0; |
793ff80c | 211 | Int_t sectEnd = AliTRDgeometry::Nsect(); |
f7336fa3 | 212 | |
3e1a3ad8 | 213 | // Start clustering in every chamber |
f7336fa3 | 214 | for (Int_t icham = chamBeg; icham < chamEnd; icham++) { |
215 | for (Int_t iplan = planBeg; iplan < planEnd; iplan++) { | |
216 | for (Int_t isect = sectBeg; isect < sectEnd; isect++) { | |
217 | ||
8230f242 | 218 | Int_t idet = geo->GetDetector(iplan,icham,isect); |
f7336fa3 | 219 | |
db30bf0f | 220 | Int_t nClusters = 0; |
221 | Int_t nClusters2pad = 0; | |
222 | Int_t nClusters3pad = 0; | |
223 | Int_t nClusters4pad = 0; | |
224 | Int_t nClusters5pad = 0; | |
225 | Int_t nClustersLarge = 0; | |
3e1a3ad8 | 226 | |
47517f42 | 227 | if (fVerbose > 0) { |
17b26de4 | 228 | printf("<AliTRDclusterizerV1::MakeCluster> "); |
47517f42 | 229 | printf("Analyzing chamber %d, plane %d, sector %d.\n" |
230 | ,icham,iplan,isect); | |
231 | } | |
f7336fa3 | 232 | |
5443e65e | 233 | Int_t nRowMax = fPar->GetRowMax(iplan,icham,isect); |
234 | Int_t nColMax = fPar->GetColMax(iplan); | |
235 | Int_t nTimeBefore = fPar->GetTimeBefore(); | |
236 | Int_t nTimeTotal = fPar->GetTimeTotal(); | |
237 | ||
238 | Float_t row0 = fPar->GetRow0(iplan,icham,isect); | |
239 | Float_t col0 = fPar->GetCol0(iplan); | |
240 | Float_t rowSize = fPar->GetRowPadSize(iplan,icham,isect); | |
241 | Float_t colSize = fPar->GetColPadSize(iplan); | |
f7336fa3 | 242 | |
3e1a3ad8 | 243 | // Get the digits |
8230f242 | 244 | digits = fDigitsManager->GetDigits(idet); |
3e1a3ad8 | 245 | digits->Expand(); |
793ff80c | 246 | track0 = fDigitsManager->GetDictionary(idet,0); |
3e1a3ad8 | 247 | track0->Expand(); |
793ff80c | 248 | track1 = fDigitsManager->GetDictionary(idet,1); |
3e1a3ad8 | 249 | track1->Expand(); |
793ff80c | 250 | track2 = fDigitsManager->GetDictionary(idet,2); |
3e1a3ad8 | 251 | track2->Expand(); |
252 | ||
253 | // Loop through the chamber and find the maxima | |
254 | for ( row = 0; row < nRowMax; row++) { | |
95d99e62 | 255 | // for ( col = 2; col < nColMax; col++) { |
256 | for ( col = 4; col < nColMax-2; col++) { | |
3e1a3ad8 | 257 | for (time = 0; time < nTimeTotal; time++) { |
258 | ||
a819a5f7 | 259 | Int_t signalL = TMath::Abs(digits->GetDataUnchecked(row,col ,time)); |
260 | Int_t signalM = TMath::Abs(digits->GetDataUnchecked(row,col-1,time)); | |
261 | Int_t signalR = TMath::Abs(digits->GetDataUnchecked(row,col-2,time)); | |
3e1a3ad8 | 262 | |
263 | // Look for the maximum | |
db30bf0f | 264 | if (signalM >= maxThresh) { |
265 | if (((signalL >= sigThresh) && | |
266 | (signalL < signalM)) || | |
267 | ((signalR >= sigThresh) && | |
268 | (signalR < signalM))) { | |
3e1a3ad8 | 269 | // Maximum found, mark the position by a negative signal |
270 | digits->SetDataUnchecked(row,col-1,time,-signalM); | |
271 | } | |
272 | } | |
273 | ||
274 | } | |
275 | } | |
276 | } | |
277 | ||
278 | // Now check the maxima and calculate the cluster position | |
279 | for ( row = 0; row < nRowMax ; row++) { | |
db30bf0f | 280 | for (time = 0; time < nTimeTotal; time++) { |
281 | for ( col = 1; col < nColMax-1; col++) { | |
3e1a3ad8 | 282 | |
283 | // Maximum found ? | |
284 | if (digits->GetDataUnchecked(row,col,time) < 0) { | |
f7336fa3 | 285 | |
9d0b222b | 286 | Int_t iPad; |
8230f242 | 287 | for (iPad = 0; iPad < kNclus; iPad++) { |
3e1a3ad8 | 288 | Int_t iPadCol = col - 1 + iPad; |
289 | clusterSignal[iPad] = TMath::Abs(digits->GetDataUnchecked(row | |
290 | ,iPadCol | |
291 | ,time)); | |
292 | clusterDigit[iPad] = digits->GetIndexUnchecked(row,iPadCol,time); | |
293 | clusterTracks[3*iPad ] = track0->GetDataUnchecked(row,iPadCol,time) - 1; | |
294 | clusterTracks[3*iPad+1] = track1->GetDataUnchecked(row,iPadCol,time) - 1; | |
295 | clusterTracks[3*iPad+2] = track2->GetDataUnchecked(row,iPadCol,time) - 1; | |
f7336fa3 | 296 | } |
297 | ||
db30bf0f | 298 | // Count the number of pads in the cluster |
299 | Int_t nPadCount = 0; | |
300 | Int_t ii = 0; | |
301 | while (TMath::Abs(digits->GetDataUnchecked(row,col-ii ,time)) | |
302 | >= sigThresh) { | |
303 | nPadCount++; | |
304 | ii++; | |
305 | if (col-ii < 0) break; | |
306 | } | |
307 | ii = 0; | |
308 | while (TMath::Abs(digits->GetDataUnchecked(row,col+ii+1,time)) | |
309 | >= sigThresh) { | |
310 | nPadCount++; | |
311 | ii++; | |
312 | if (col+ii+1 >= nColMax) break; | |
313 | } | |
314 | ||
315 | nClusters++; | |
316 | switch (nPadCount) { | |
317 | case 2: | |
318 | iType = 0; | |
319 | nClusters2pad++; | |
320 | break; | |
321 | case 3: | |
322 | iType = 1; | |
323 | nClusters3pad++; | |
324 | break; | |
325 | case 4: | |
326 | iType = 2; | |
327 | nClusters4pad++; | |
328 | break; | |
329 | case 5: | |
330 | iType = 3; | |
331 | nClusters5pad++; | |
332 | break; | |
333 | default: | |
334 | iType = 4; | |
335 | nClustersLarge++; | |
336 | break; | |
337 | }; | |
338 | ||
339 | // Don't analyze large clusters | |
340 | //if (iType == 4) continue; | |
341 | ||
342 | // Look for 5 pad cluster with minimum in the middle | |
343 | Bool_t fivePadCluster = kFALSE; | |
3e1a3ad8 | 344 | if (col < nColMax-3) { |
345 | if (digits->GetDataUnchecked(row,col+2,time) < 0) { | |
db30bf0f | 346 | fivePadCluster = kTRUE; |
347 | } | |
348 | if ((fivePadCluster) && (col < nColMax-5)) { | |
349 | if (digits->GetDataUnchecked(row,col+4,time) >= sigThresh) { | |
350 | fivePadCluster = kFALSE; | |
351 | } | |
352 | } | |
353 | if ((fivePadCluster) && (col > 1)) { | |
354 | if (digits->GetDataUnchecked(row,col-2,time) >= sigThresh) { | |
355 | fivePadCluster = kFALSE; | |
356 | } | |
357 | } | |
358 | } | |
359 | ||
360 | // 5 pad cluster | |
361 | // Modify the signal of the overlapping pad for the left part | |
362 | // of the cluster which remains from a previous unfolding | |
363 | if (iUnfold) { | |
364 | clusterSignal[0] *= ratioLeft; | |
365 | iType = 3; | |
366 | iUnfold = 0; | |
367 | } | |
368 | ||
369 | // Unfold the 5 pad cluster | |
370 | if (fivePadCluster) { | |
371 | for (iPad = 0; iPad < kNsig; iPad++) { | |
372 | padSignal[iPad] = TMath::Abs(digits->GetDataUnchecked(row | |
373 | ,col-1+iPad | |
374 | ,time)); | |
f7336fa3 | 375 | } |
db30bf0f | 376 | // Unfold the two maxima and set the signal on |
377 | // the overlapping pad to the ratio | |
17b26de4 | 378 | ratioRight = Unfold(kEpsilon,iplan,padSignal); |
db30bf0f | 379 | ratioLeft = 1.0 - ratioRight; |
380 | clusterSignal[2] *= ratioRight; | |
381 | iType = 3; | |
382 | iUnfold = 1; | |
f7336fa3 | 383 | } |
f7336fa3 | 384 | |
3e1a3ad8 | 385 | Float_t clusterCharge = clusterSignal[0] |
386 | + clusterSignal[1] | |
387 | + clusterSignal[2]; | |
388 | ||
db30bf0f | 389 | // The position of the cluster |
3e1a3ad8 | 390 | clusterPads[0] = row + 0.5; |
3e1a3ad8 | 391 | // Take the shift of the additional time bins into account |
392 | clusterPads[2] = time - nTimeBefore + 0.5; | |
393 | ||
17b26de4 | 394 | if (fPar->LUTOn()) { |
db30bf0f | 395 | |
396 | // Calculate the position of the cluster by using the | |
397 | // lookup table method | |
5443e65e | 398 | clusterPads[1] = col + 0.5 |
399 | + fPar->LUTposition(iplan,clusterSignal[0] | |
17b26de4 | 400 | ,clusterSignal[1] |
401 | ,clusterSignal[2]); | |
db30bf0f | 402 | |
403 | } | |
404 | else { | |
405 | ||
406 | // Calculate the position of the cluster by using the | |
407 | // center of gravity method | |
408 | clusterPads[1] = col + 0.5 | |
409 | + (clusterSignal[2] - clusterSignal[0]) | |
410 | / clusterCharge; | |
411 | ||
412 | } | |
413 | ||
5443e65e | 414 | Float_t q0 = clusterSignal[0]; |
415 | Float_t q1 = clusterSignal[1]; | |
416 | Float_t q2 = clusterSignal[2]; | |
417 | Float_t clusterSigmaY2 = (q1*(q0+q2)+4*q0*q2) / | |
418 | (clusterCharge*clusterCharge); | |
a819a5f7 | 419 | |
420 | // Correct for ExB displacement | |
17b26de4 | 421 | if (fPar->ExBOn()) { |
a819a5f7 | 422 | Int_t local_time_bin = (Int_t) clusterPads[2]; |
423 | Float_t driftLength = local_time_bin * timeBinSize + kAmWidth; | |
17b26de4 | 424 | Float_t colSize = fPar->GetColPadSize(iplan); |
a819a5f7 | 425 | Float_t deltaY = omegaTau*driftLength/colSize; |
426 | clusterPads[1] = clusterPads[1] - deltaY; | |
427 | } | |
428 | ||
47517f42 | 429 | if (fVerbose > 1) { |
3e1a3ad8 | 430 | printf("-----------------------------------------------------------\n"); |
431 | printf("Create cluster no. %d\n",nClusters); | |
432 | printf("Position: row = %f, col = %f, time = %f\n",clusterPads[0] | |
433 | ,clusterPads[1] | |
434 | ,clusterPads[2]); | |
435 | printf("Indices: %d, %d, %d\n",clusterDigit[0] | |
436 | ,clusterDigit[1] | |
437 | ,clusterDigit[2]); | |
438 | printf("Total charge = %f\n",clusterCharge); | |
439 | printf("Tracks: pad0 %d, %d, %d\n",clusterTracks[0] | |
440 | ,clusterTracks[1] | |
441 | ,clusterTracks[2]); | |
442 | printf(" pad1 %d, %d, %d\n",clusterTracks[3] | |
443 | ,clusterTracks[4] | |
444 | ,clusterTracks[5]); | |
445 | printf(" pad2 %d, %d, %d\n",clusterTracks[6] | |
446 | ,clusterTracks[7] | |
447 | ,clusterTracks[8]); | |
db30bf0f | 448 | printf("Type = %d, Number of pads = %d\n",iType,nPadCount); |
f7336fa3 | 449 | } |
450 | ||
5443e65e | 451 | // Calculate the position and the error |
452 | Float_t clusterPos[3]; | |
453 | clusterPos[0] = clusterPads[1] * colSize + col0; | |
454 | clusterPos[1] = clusterPads[0] * rowSize + row0; | |
455 | clusterPos[2] = clusterPads[2]; | |
456 | Float_t clusterSig[2]; | |
457 | clusterSig[0] = (clusterSigmaY2 + 1./12.) * colSize*colSize; | |
458 | clusterSig[1] = rowSize * rowSize / 12.; | |
459 | ||
f7336fa3 | 460 | // Add the cluster to the output array |
bdbb05bb | 461 | AddCluster(clusterPos |
462 | ,idet | |
463 | ,clusterCharge | |
464 | ,clusterTracks | |
465 | ,clusterSig | |
466 | ,iType); | |
f7336fa3 | 467 | |
468 | } | |
3e1a3ad8 | 469 | } |
470 | } | |
471 | } | |
f7336fa3 | 472 | |
3e1a3ad8 | 473 | // Compress the arrays |
474 | digits->Compress(1,0); | |
475 | track0->Compress(1,0); | |
476 | track1->Compress(1,0); | |
477 | track2->Compress(1,0); | |
f7336fa3 | 478 | |
3e1a3ad8 | 479 | // Write the cluster and reset the array |
793ff80c | 480 | WriteClusters(idet); |
bdbb05bb | 481 | ResetRecPoints(); |
793ff80c | 482 | |
47517f42 | 483 | if (fVerbose > 0) { |
17b26de4 | 484 | printf("<AliTRDclusterizerV1::MakeCluster> "); |
47517f42 | 485 | printf("Found %d clusters in total.\n" |
486 | ,nClusters); | |
487 | printf(" 2pad: %d\n",nClusters2pad); | |
488 | printf(" 3pad: %d\n",nClusters3pad); | |
489 | printf(" 4pad: %d\n",nClusters4pad); | |
490 | printf(" 5pad: %d\n",nClusters5pad); | |
491 | printf(" Large: %d\n",nClustersLarge); | |
492 | } | |
f7336fa3 | 493 | |
3e1a3ad8 | 494 | } |
495 | } | |
496 | } | |
f7336fa3 | 497 | |
47517f42 | 498 | if (fVerbose > 0) { |
17b26de4 | 499 | printf("<AliTRDclusterizerV1::MakeCluster> "); |
47517f42 | 500 | printf("Done.\n"); |
501 | } | |
f7336fa3 | 502 | |
503 | return kTRUE; | |
504 | ||
505 | } | |
506 | ||
507 | //_____________________________________________________________________________ | |
17b26de4 | 508 | Float_t AliTRDclusterizerV1::Unfold(Float_t eps, Int_t plane, Float_t* padSignal) |
f7336fa3 | 509 | { |
510 | // | |
511 | // Method to unfold neighbouring maxima. | |
512 | // The charge ratio on the overlapping pad is calculated | |
513 | // until there is no more change within the range given by eps. | |
514 | // The resulting ratio is then returned to the calling method. | |
515 | // | |
516 | ||
17b26de4 | 517 | Int_t irc = 0; |
3e1a3ad8 | 518 | Int_t itStep = 0; // Count iteration steps |
f7336fa3 | 519 | |
3e1a3ad8 | 520 | Float_t ratio = 0.5; // Start value for ratio |
521 | Float_t prevRatio = 0; // Store previous ratio | |
f7336fa3 | 522 | |
3e1a3ad8 | 523 | Float_t newLeftSignal[3] = {0}; // Array to store left cluster signal |
524 | Float_t newRightSignal[3] = {0}; // Array to store right cluster signal | |
17b26de4 | 525 | Float_t newSignal[3] = {0}; |
f7336fa3 | 526 | |
3e1a3ad8 | 527 | // Start the iteration |
f7336fa3 | 528 | while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) { |
529 | ||
530 | itStep++; | |
531 | prevRatio = ratio; | |
532 | ||
3e1a3ad8 | 533 | // Cluster position according to charge ratio |
534 | Float_t maxLeft = (ratio*padSignal[2] - padSignal[0]) | |
535 | / (padSignal[0] + padSignal[1] + ratio*padSignal[2]); | |
536 | Float_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2]) | |
537 | / ((1-ratio)*padSignal[2] + padSignal[3] + padSignal[4]); | |
f7336fa3 | 538 | |
3e1a3ad8 | 539 | // Set cluster charge ratio |
17b26de4 | 540 | irc = fPar->PadResponse(1.0,maxLeft ,plane,newSignal); |
541 | Float_t ampLeft = padSignal[1] / newSignal[1]; | |
542 | irc = fPar->PadResponse(1.0,maxRight,plane,newSignal); | |
543 | Float_t ampRight = padSignal[3] / newSignal[1]; | |
f7336fa3 | 544 | |
3e1a3ad8 | 545 | // Apply pad response to parameters |
17b26de4 | 546 | irc = fPar->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal ); |
547 | irc = fPar->PadResponse(ampRight,maxRight,plane,newRightSignal); | |
f7336fa3 | 548 | |
3e1a3ad8 | 549 | // Calculate new overlapping ratio |
26edf6a4 | 550 | ratio = TMath::Min((Float_t)1.0,newLeftSignal[2] / |
db30bf0f | 551 | (newLeftSignal[2] + newRightSignal[0])); |
f7336fa3 | 552 | |
553 | } | |
554 | ||
555 | return ratio; | |
556 | ||
557 | } | |
558 |