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75bd7f81 | 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 seed of a local TRD track // | |
21 | // // | |
75bd7f81 | 22 | /////////////////////////////////////////////////////////////////////////////// |
23 | ||
ad670fba | 24 | #include "TMath.h" |
25 | #include "TLinearFitter.h" | |
26 | ||
4fad09c9 | 27 | #include "AliMathBase.h" |
28 | ||
75bd7f81 | 29 | #include "AliTRDseed.h" |
30 | #include "AliTRDcluster.h" | |
31 | #include "AliTRDtracker.h" | |
2985ffcb | 32 | #include "AliTRDtrackerV1.h" |
75bd7f81 | 33 | |
75bd7f81 | 34 | ClassImp(AliTRDseed) |
fbb2ea06 | 35 | |
75bd7f81 | 36 | //_____________________________________________________________________________ |
ad670fba | 37 | AliTRDseed::AliTRDseed() |
38 | :TObject() | |
39 | ,fTilt(0) | |
40 | ,fPadLength(0) | |
41 | ,fX0(0) | |
42 | ,fSigmaY(0) | |
43 | ,fSigmaY2(0) | |
44 | ,fMeanz(0) | |
45 | ,fZProb(0) | |
46 | ,fN(0) | |
47 | ,fN2(0) | |
48 | ,fNUsed(0) | |
49 | ,fFreq(0) | |
50 | ,fNChange(0) | |
51 | ,fMPads(0) | |
52 | ,fC(0) | |
53 | ,fCC(0) | |
54 | ,fChi2(1.0e10) | |
55 | ,fChi2Z(1.0e10) | |
75bd7f81 | 56 | { |
57 | // | |
58 | // Default constructor | |
59 | // | |
60 | ||
e4f2f73d | 61 | for (Int_t i = 0; i < knTimebins; i++) { |
ad670fba | 62 | fX[i] = 0; // x position |
63 | fY[i] = 0; // y position | |
64 | fZ[i] = 0; // z position | |
65 | fIndexes[i] = 0; // Indexes | |
4d6aee34 | 66 | fClusters[i] = NULL; // Clusters |
ad670fba | 67 | fUsable[i] = 0; // Indication - usable cluster |
68 | } | |
69 | ||
70 | for (Int_t i = 0; i < 2; i++) { | |
71 | fYref[i] = 0; // Reference y | |
72 | fZref[i] = 0; // Reference z | |
73 | fYfit[i] = 0; // Y fit position +derivation | |
74 | fYfitR[i] = 0; // Y fit position +derivation | |
75 | fZfit[i] = 0; // Z fit position | |
76 | fZfitR[i] = 0; // Z fit position | |
77 | fLabels[i] = 0; // Labels | |
78 | } | |
79 | ||
80 | } | |
81 | ||
82 | //_____________________________________________________________________________ | |
83 | AliTRDseed::AliTRDseed(const AliTRDseed &s) | |
84 | :TObject(s) | |
4fad09c9 | 85 | ,fTilt(s.fTilt) |
86 | ,fPadLength(s.fPadLength) | |
87 | ,fX0(s.fX0) | |
88 | ,fSigmaY(s.fSigmaY) | |
89 | ,fSigmaY2(s.fSigmaY2) | |
90 | ,fMeanz(s.fMeanz) | |
91 | ,fZProb(s.fZProb) | |
92 | ,fN(s.fN) | |
93 | ,fN2(s.fN2) | |
94 | ,fNUsed(s.fNUsed) | |
95 | ,fFreq(s.fFreq) | |
96 | ,fNChange(s.fNChange) | |
97 | ,fMPads(s.fMPads) | |
98 | ,fC(s.fC) | |
99 | ,fCC(s.fCC) | |
100 | ,fChi2(s.fChi2) | |
101 | ,fChi2Z(s.fChi2Z) | |
ad670fba | 102 | { |
103 | // | |
104 | // Copy constructor | |
105 | // | |
106 | ||
e4f2f73d | 107 | for (Int_t i = 0; i < knTimebins; i++) { |
4fad09c9 | 108 | fX[i] = s.fX[i]; // x position |
109 | fY[i] = s.fY[i]; // y position | |
110 | fZ[i] = s.fZ[i]; // z position | |
111 | fIndexes[i] = s.fIndexes[i]; // Indexes | |
112 | fClusters[i] = s.fClusters[i]; // Clusters | |
113 | fUsable[i] = s.fUsable[i]; // Indication - usable cluster | |
75bd7f81 | 114 | } |
ad670fba | 115 | |
75bd7f81 | 116 | for (Int_t i = 0; i < 2; i++) { |
4fad09c9 | 117 | fYref[i] = s.fYref[i]; // Reference y |
118 | fZref[i] = s.fZref[i]; // Reference z | |
119 | fYfit[i] = s.fYfit[i]; // Y fit position +derivation | |
120 | fYfitR[i] = s.fYfitR[i]; // Y fit position +derivation | |
121 | fZfit[i] = s.fZfit[i]; // Z fit position | |
122 | fZfitR[i] = s.fZfitR[i]; // Z fit position | |
123 | fLabels[i] = s.fLabels[i]; // Labels | |
75bd7f81 | 124 | } |
125 | ||
126 | } | |
127 | ||
e4f2f73d | 128 | //_____________________________________________________________________________ |
0906e73e | 129 | void AliTRDseed::Copy(TObject &o) const |
d76231c8 | 130 | { |
0906e73e | 131 | //printf("AliTRDseed::Copy()\n"); |
d76231c8 | 132 | |
0906e73e | 133 | AliTRDseed &seed = (AliTRDseed &)o; |
134 | ||
0906e73e | 135 | seed.fTilt = fTilt; |
e4f2f73d | 136 | seed.fPadLength = fPadLength; |
137 | seed.fX0 = fX0; | |
138 | seed.fSigmaY = fSigmaY; | |
139 | seed.fSigmaY2 = fSigmaY2; | |
140 | seed.fMeanz = fMeanz; | |
141 | seed.fZProb = fZProb; | |
142 | seed.fN = fN; | |
143 | seed.fN2 = fN2; | |
144 | seed.fNUsed = fNUsed; | |
145 | seed.fFreq = fFreq; | |
146 | seed.fNChange = fNChange; | |
147 | seed.fMPads = fMPads; | |
148 | seed.fC = fC; | |
149 | seed.fCC = fCC; | |
150 | seed.fChi2 = fChi2; | |
151 | seed.fChi2Z = fChi2Z; | |
0906e73e | 152 | for (Int_t i = 0; i < knTimebins; i++) { |
e4f2f73d | 153 | seed.fX[i] = fX[i]; |
154 | seed.fY[i] = fY[i]; | |
155 | seed.fZ[i] = fZ[i]; | |
156 | seed.fIndexes[i] = fIndexes[i]; | |
157 | seed.fClusters[i] = fClusters[i]; | |
158 | seed.fUsable[i] = fUsable[i]; | |
159 | } | |
160 | ||
161 | for (Int_t i = 0; i < 2; i++) { | |
162 | seed.fYref[i] = fYref[i]; | |
163 | seed.fZref[i] = fZref[i]; | |
164 | seed.fYfit[i] = fYfit[i]; | |
165 | seed.fYfitR[i] = fYfitR[i]; | |
166 | seed.fZfit[i] = fZfit[i]; | |
167 | seed.fZfitR[i] = fZfitR[i]; | |
168 | seed.fLabels[i] = fLabels[i]; | |
169 | } | |
170 | ||
171 | TObject::Copy(seed); | |
172 | ||
173 | } | |
174 | ||
75bd7f81 | 175 | //_____________________________________________________________________________ |
176 | void AliTRDseed::Reset() | |
177 | { | |
178 | // | |
179 | // Reset seed | |
180 | // | |
181 | ||
e4f2f73d | 182 | for (Int_t i = 0; i < knTimebins; i++) { |
ad670fba | 183 | fX[i] = 0; // X position |
184 | fY[i] = 0; // Y position | |
185 | fZ[i] = 0; // Z position | |
186 | fIndexes[i] = 0; // Indexes | |
4d6aee34 | 187 | fClusters[i] = NULL; // Clusters |
75bd7f81 | 188 | fUsable[i] = kFALSE; |
189 | } | |
ad670fba | 190 | |
75bd7f81 | 191 | for (Int_t i = 0; i < 2; i++) { |
ad670fba | 192 | fYref[i] = 0; // Reference y |
193 | fZref[i] = 0; // Reference z | |
194 | fYfit[i] = 0; // Y fit position +derivation | |
195 | fYfitR[i] = 0; // Y fit position +derivation | |
196 | fZfit[i] = 0; // Z fit position | |
197 | fZfitR[i] = 0; // Z fit position | |
198 | fLabels[i] = -1; // Labels | |
75bd7f81 | 199 | } |
ad670fba | 200 | fSigmaY = 0; // "Robust" sigma in y |
201 | fSigmaY2 = 0; // "Robust" sigma in y | |
202 | fMeanz = 0; // Mean vaue of z | |
203 | fZProb = 0; // Max probbable z | |
75bd7f81 | 204 | fMPads = 0; |
ad670fba | 205 | fN = 0; // Number of associated clusters |
206 | fN2 = 0; // Number of not crossed | |
207 | fNUsed = 0; // Number of used clusters | |
208 | fNChange = 0; // Change z counter | |
75bd7f81 | 209 | |
210 | } | |
211 | ||
212 | //_____________________________________________________________________________ | |
213 | void AliTRDseed::CookLabels() | |
214 | { | |
215 | // | |
216 | // Cook 2 labels for seed | |
217 | // | |
218 | ||
219 | Int_t labels[200]; | |
220 | Int_t out[200]; | |
ad670fba | 221 | Int_t nlab = 0; |
222 | ||
2985ffcb | 223 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) { |
75bd7f81 | 224 | if (!fClusters[i]) continue; |
ad670fba | 225 | for (Int_t ilab = 0; ilab < 3; ilab++) { |
226 | if (fClusters[i]->GetLabel(ilab) >= 0) { | |
75bd7f81 | 227 | labels[nlab] = fClusters[i]->GetLabel(ilab); |
228 | nlab++; | |
229 | } | |
230 | } | |
231 | } | |
ad670fba | 232 | |
75bd7f81 | 233 | Int_t nlab2 = AliTRDtracker::Freq(nlab,labels,out,kTRUE); |
234 | fLabels[0] = out[0]; | |
ad670fba | 235 | if ((nlab2 > 1) && |
236 | (out[3] > 1)) { | |
237 | fLabels[1] = out[2]; | |
238 | } | |
75bd7f81 | 239 | |
240 | } | |
241 | ||
242 | //_____________________________________________________________________________ | |
243 | void AliTRDseed::UseClusters() | |
244 | { | |
245 | // | |
246 | // Use clusters | |
247 | // | |
248 | ||
2985ffcb | 249 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) { |
75bd7f81 | 250 | if (!fClusters[i]) continue; |
251 | if (!(fClusters[i]->IsUsed())) fClusters[i]->Use(); | |
252 | } | |
253 | ||
254 | } | |
255 | ||
256 | //_____________________________________________________________________________ | |
257 | void AliTRDseed::Update() | |
258 | { | |
259 | // | |
260 | // Update the seed. | |
261 | // | |
262 | ||
0906e73e | 263 | |
bcb6fb78 | 264 | |
265 | // linear fit on the y direction with respect to the reference direction. | |
266 | // The residuals for each x (x = xc - x0) are deduced from: | |
267 | // dy = y - yt (1) | |
268 | // the tilting correction is written : | |
269 | // y = yc + h*(zc-zt) (2) | |
270 | // yt = y0+dy/dx*x (3) | |
271 | // zt = z0+dz/dx*x (4) | |
272 | // from (1),(2),(3) and (4) | |
273 | // dy = yc - y0 - (dy/dx + h*dz/dx)*x + h*(zc-z0) | |
274 | // the last term introduces the correction on y direction due to tilting pads. There are 2 ways to account for this: | |
275 | // 1. use tilting correction for calculating the y | |
276 | // 2. neglect tilting correction here and account for it in the error parametrization of the tracklet. | |
0906e73e | 277 | |
75bd7f81 | 278 | const Float_t kRatio = 0.8; |
e4f2f73d | 279 | const Int_t kClmin = 5; |
75bd7f81 | 280 | const Float_t kmaxtan = 2; |
281 | ||
e4f2f73d | 282 | if (TMath::Abs(fYref[1]) > kmaxtan){ |
283 | //printf("Exit: Abs(fYref[1]) = %3.3f, kmaxtan = %3.3f\n", TMath::Abs(fYref[1]), kmaxtan); | |
284 | return; // Track inclined too much | |
285 | } | |
ad670fba | 286 | |
287 | Float_t sigmaexp = 0.05 + TMath::Abs(fYref[1] * 0.25); // Expected r.m.s in y direction | |
288 | Float_t ycrosscor = fPadLength * fTilt * 0.5; // Y correction for crossing | |
289 | fNChange = 0; | |
290 | ||
291 | Double_t sumw; | |
292 | Double_t sumwx; | |
293 | Double_t sumwx2; | |
294 | Double_t sumwy; | |
295 | Double_t sumwxy; | |
296 | Double_t sumwz; | |
297 | Double_t sumwxz; | |
298 | ||
e4f2f73d | 299 | // Buffering: Leave it constant fot Performance issues |
300 | Int_t zints[knTimebins]; // Histograming of the z coordinate | |
ad670fba | 301 | // Get 1 and second max probable coodinates in z |
e4f2f73d | 302 | Int_t zouts[2*knTimebins]; |
303 | Float_t allowedz[knTimebins]; // Allowed z for given time bin | |
304 | Float_t yres[knTimebins]; // Residuals from reference | |
0849f128 | 305 | //Float_t anglecor = fTilt * fZref[1]; // Correction to the angle |
75bd7f81 | 306 | |
307 | ||
ad670fba | 308 | fN = 0; |
309 | fN2 = 0; | |
2985ffcb | 310 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) { |
ad670fba | 311 | yres[i] = 10000.0; |
75bd7f81 | 312 | if (!fClusters[i]) continue; |
bcb6fb78 | 313 | if(!fClusters[i]->IsInChamber()) continue; |
0849f128 | 314 | // Residual y |
315 | //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + fTilt*(fZ[i] - fZref[0]); | |
316 | yres[i] = fY[i] - fTilt*(fZ[i] - (fZref[0] - fX[i]*fZref[1])); | |
75bd7f81 | 317 | zints[fN] = Int_t(fZ[i]); |
318 | fN++; | |
319 | } | |
320 | ||
e4f2f73d | 321 | if (fN < kClmin){ |
322 | //printf("Exit fN < kClmin: fN = %d\n", fN); | |
323 | return; | |
324 | } | |
bcb6fb78 | 325 | Int_t nz = AliTRDtracker::Freq(fN, zints, zouts, kFALSE); |
75bd7f81 | 326 | fZProb = zouts[0]; |
ad670fba | 327 | if (nz <= 1) zouts[3] = 0; |
e4f2f73d | 328 | if (zouts[1] + zouts[3] < kClmin) { |
329 | //printf("Exit zouts[1] = %d, zouts[3] = %d\n",zouts[1],zouts[3]); | |
330 | return; | |
331 | } | |
75bd7f81 | 332 | |
ad670fba | 333 | // Z distance bigger than pad - length |
bcb6fb78 | 334 | if (TMath::Abs(zouts[0]-zouts[2]) > 12.0) zouts[3] = 0; |
75bd7f81 | 335 | |
336 | Int_t breaktime = -1; | |
337 | Bool_t mbefore = kFALSE; | |
e4f2f73d | 338 | Int_t cumul[knTimebins][2]; |
ad670fba | 339 | Int_t counts[2] = { 0, 0 }; |
75bd7f81 | 340 | |
ad670fba | 341 | if (zouts[3] >= 3) { |
35c24814 | 342 | |
343 | // | |
344 | // Find the break time allowing one chage on pad-rows | |
345 | // with maximal number of accepted clusters | |
346 | // | |
ad670fba | 347 | fNChange = 1; |
2985ffcb | 348 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) { |
75bd7f81 | 349 | cumul[i][0] = counts[0]; |
350 | cumul[i][1] = counts[1]; | |
ad670fba | 351 | if (TMath::Abs(fZ[i]-zouts[0]) < 2) counts[0]++; |
352 | if (TMath::Abs(fZ[i]-zouts[2]) < 2) counts[1]++; | |
75bd7f81 | 353 | } |
ad670fba | 354 | Int_t maxcount = 0; |
2985ffcb | 355 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) { |
35c24814 | 356 | Int_t after = cumul[AliTRDtrackerV1::GetNTimeBins()][0] - cumul[i][0]; |
75bd7f81 | 357 | Int_t before = cumul[i][1]; |
ad670fba | 358 | if (after + before > maxcount) { |
35c24814 | 359 | maxcount = after + before; |
360 | breaktime = i; | |
361 | mbefore = kFALSE; | |
75bd7f81 | 362 | } |
35c24814 | 363 | after = cumul[AliTRDtrackerV1::GetNTimeBins()-1][1] - cumul[i][1]; |
75bd7f81 | 364 | before = cumul[i][0]; |
ad670fba | 365 | if (after + before > maxcount) { |
35c24814 | 366 | maxcount = after + before; |
367 | breaktime = i; | |
368 | mbefore = kTRUE; | |
75bd7f81 | 369 | } |
370 | } | |
35c24814 | 371 | |
ad670fba | 372 | breaktime -= 1; |
35c24814 | 373 | |
75bd7f81 | 374 | } |
ad670fba | 375 | |
2985ffcb | 376 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) { |
ad670fba | 377 | if (i > breaktime) allowedz[i] = mbefore ? zouts[2] : zouts[0]; |
378 | if (i <= breaktime) allowedz[i] = (!mbefore) ? zouts[2] : zouts[0]; | |
75bd7f81 | 379 | } |
ad670fba | 380 | |
2985ffcb | 381 | if (((allowedz[0] > allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] < 0)) || |
382 | ((allowedz[0] < allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] > 0))) { | |
75bd7f81 | 383 | // |
ad670fba | 384 | // Tracklet z-direction not in correspondance with track z direction |
75bd7f81 | 385 | // |
ad670fba | 386 | fNChange = 0; |
35c24814 | 387 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) { |
388 | allowedz[i] = zouts[0]; // Only longest taken | |
389 | } | |
75bd7f81 | 390 | } |
391 | ||
35c24814 | 392 | if (fNChange > 0) { |
75bd7f81 | 393 | // |
ad670fba | 394 | // Cross pad -row tracklet - take the step change into account |
75bd7f81 | 395 | // |
2985ffcb | 396 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) { |
75bd7f81 | 397 | if (!fClusters[i]) continue; |
bcb6fb78 | 398 | if(!fClusters[i]->IsInChamber()) continue; |
ad670fba | 399 | if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue; |
0849f128 | 400 | // Residual y |
401 | //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] /*+ fTilt*(fZ[i] - fZref[0])*/; | |
402 | yres[i] = fY[i] - fTilt*(fZ[i] - (fZref[0] - fX[i]*fZref[1])); | |
403 | /* if (TMath::Abs(fZ[i] - fZProb) > 2) { | |
404 | if (fZ[i] > fZProb) yres[i] += fTilt * fPadLength; | |
405 | if (fZ[i] < fZProb) yres[i] -= fTilt * fPadLength; | |
406 | }*/ | |
75bd7f81 | 407 | } |
35c24814 | 408 | } |
75bd7f81 | 409 | |
e4f2f73d | 410 | Double_t yres2[knTimebins]; |
ad670fba | 411 | Double_t mean; |
412 | Double_t sigma; | |
2985ffcb | 413 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) { |
75bd7f81 | 414 | if (!fClusters[i]) continue; |
bcb6fb78 | 415 | if(!fClusters[i]->IsInChamber()) continue; |
ad670fba | 416 | if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue; |
417 | yres2[fN2] = yres[i]; | |
75bd7f81 | 418 | fN2++; |
419 | } | |
ad670fba | 420 | if (fN2 < kClmin) { |
e4f2f73d | 421 | //printf("Exit fN2 < kClmin: fN2 = %d\n", fN2); |
75bd7f81 | 422 | fN2 = 0; |
423 | return; | |
424 | } | |
e4f2f73d | 425 | AliMathBase::EvaluateUni(fN2,yres2,mean,sigma, Int_t(fN2*kRatio-2.)); |
ad670fba | 426 | if (sigma < sigmaexp * 0.8) { |
427 | sigma = sigmaexp; | |
428 | } | |
75bd7f81 | 429 | fSigmaY = sigma; |
ad670fba | 430 | |
431 | // Reset sums | |
432 | sumw = 0; | |
433 | sumwx = 0; | |
434 | sumwx2 = 0; | |
435 | sumwy = 0; | |
436 | sumwxy = 0; | |
437 | sumwz = 0; | |
438 | sumwxz = 0; | |
439 | ||
440 | fN2 = 0; | |
441 | fMeanz = 0; | |
442 | fMPads = 0; | |
443 | ||
2985ffcb | 444 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) { |
ad670fba | 445 | |
446 | fUsable[i] = kFALSE; | |
75bd7f81 | 447 | if (!fClusters[i]) continue; |
bcb6fb78 | 448 | if (!fClusters[i]->IsInChamber()) continue; |
4d6aee34 | 449 | if (TMath::Abs(fZ[i] - allowedz[i]) > 2){fClusters[i] = NULL; continue;} |
450 | if (TMath::Abs(yres[i] - mean) > 4.0 * sigma){fClusters[i] = NULL; continue;} | |
75bd7f81 | 451 | fUsable[i] = kTRUE; |
452 | fN2++; | |
ad670fba | 453 | fMPads += fClusters[i]->GetNPads(); |
454 | Float_t weight = 1.0; | |
455 | if (fClusters[i]->GetNPads() > 4) weight = 0.5; | |
456 | if (fClusters[i]->GetNPads() > 5) weight = 0.2; | |
457 | ||
0906e73e | 458 | |
75bd7f81 | 459 | Double_t x = fX[i]; |
0906e73e | 460 | //printf("x = %7.3f dy = %7.3f fit %7.3f\n", x, yres[i], fY[i]-yres[i]); |
461 | ||
ad670fba | 462 | sumw += weight; |
463 | sumwx += x * weight; | |
464 | sumwx2 += x*x * weight; | |
465 | sumwy += weight * yres[i]; | |
466 | sumwxy += weight * (yres[i]) * x; | |
467 | sumwz += weight * fZ[i]; | |
468 | sumwxz += weight * fZ[i] * x; | |
469 | ||
75bd7f81 | 470 | } |
ad670fba | 471 | |
472 | if (fN2 < kClmin){ | |
e4f2f73d | 473 | //printf("Exit fN2 < kClmin(2): fN2 = %d\n",fN2); |
75bd7f81 | 474 | fN2 = 0; |
475 | return; | |
476 | } | |
ad670fba | 477 | fMeanz = sumwz / sumw; |
478 | Float_t correction = 0; | |
479 | if (fNChange > 0) { | |
480 | // Tracklet on boundary | |
481 | if (fMeanz < fZProb) correction = ycrosscor; | |
482 | if (fMeanz > fZProb) correction = -ycrosscor; | |
75bd7f81 | 483 | } |
ad670fba | 484 | |
485 | Double_t det = sumw * sumwx2 - sumwx * sumwx; | |
486 | fYfitR[0] = (sumwx2 * sumwy - sumwx * sumwxy) / det; | |
487 | fYfitR[1] = (sumw * sumwxy - sumwx * sumwy) / det; | |
75bd7f81 | 488 | |
ad670fba | 489 | fSigmaY2 = 0; |
2985ffcb | 490 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) { |
75bd7f81 | 491 | if (!fUsable[i]) continue; |
ad670fba | 492 | Float_t delta = yres[i] - fYfitR[0] - fYfitR[1] * fX[i]; |
493 | fSigmaY2 += delta*delta; | |
75bd7f81 | 494 | } |
ad670fba | 495 | fSigmaY2 = TMath::Sqrt(fSigmaY2 / Float_t(fN2-2)); |
0906e73e | 496 | // TEMPORARY UNTIL covariance properly calculated |
497 | fSigmaY2 = TMath::Max(fSigmaY2, Float_t(.1)); | |
ad670fba | 498 | |
499 | fZfitR[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det; | |
500 | fZfitR[1] = (sumw * sumwxz - sumwx * sumwz) / det; | |
501 | fZfit[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det; | |
502 | fZfit[1] = (sumw * sumwxz - sumwx * sumwz) / det; | |
0849f128 | 503 | // fYfitR[0] += fYref[0] + correction; |
504 | // fYfitR[1] += fYref[1]; | |
ad670fba | 505 | fYfit[0] = fYfitR[0]; |
0849f128 | 506 | fYfit[1] = -fYfitR[1]; |
0906e73e | 507 | |
508 | //printf("y0 = %7.3f tgy = %7.3f z0 = %7.3f tgz = %7.3f \n", fYfitR[0], fYfitR[1], fZfitR[0], fZfitR[1]); | |
509 | ||
75bd7f81 | 510 | UpdateUsed(); |
511 | ||
512 | } | |
513 | ||
514 | //_____________________________________________________________________________ | |
515 | void AliTRDseed::UpdateUsed() | |
516 | { | |
517 | // | |
518 | // Update used seed | |
519 | // | |
520 | ||
521 | fNUsed = 0; | |
2985ffcb | 522 | for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) { |
0906e73e | 523 | if (!fClusters[i]) continue; |
524 | if(!fUsable[i]) continue; | |
525 | if ((fClusters[i]->IsUsed())) fNUsed++; | |
75bd7f81 | 526 | } |
527 | ||
528 | } | |
529 | ||
75bd7f81 | 530 | //_____________________________________________________________________________ |
531 | Float_t AliTRDseed::FitRiemanTilt(AliTRDseed * cseed, Bool_t terror) | |
532 | { | |
533 | // | |
534 | // Fit the Rieman tilt | |
535 | // | |
536 | ||
ad670fba | 537 | // Fitting with tilting pads - kz not fixed |
538 | TLinearFitter fitterT2(4,"hyp4"); | |
75bd7f81 | 539 | fitterT2.StoreData(kTRUE); |
e4f2f73d | 540 | |
ad670fba | 541 | Float_t xref2 = (cseed[2].fX0 + cseed[3].fX0) * 0.5; // Reference x0 for z |
542 | ||
543 | Int_t npointsT = 0; | |
75bd7f81 | 544 | fitterT2.ClearPoints(); |
ad670fba | 545 | |
546 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { | |
547 | ||
75bd7f81 | 548 | if (!cseed[iLayer].IsOK()) continue; |
549 | Double_t tilt = cseed[iLayer].fTilt; | |
550 | ||
2985ffcb | 551 | for (Int_t itime = 0; itime < AliTRDtrackerV1::GetNTimeBins()+1; itime++) { |
ad670fba | 552 | |
75bd7f81 | 553 | if (!cseed[iLayer].fUsable[itime]) continue; |
554 | // x relative to the midle chamber | |
ad670fba | 555 | Double_t x = cseed[iLayer].fX[itime] + cseed[iLayer].fX0 - xref2; |
556 | Double_t y = cseed[iLayer].fY[itime]; | |
557 | Double_t z = cseed[iLayer].fZ[itime]; | |
75bd7f81 | 558 | |
559 | // | |
ad670fba | 560 | // Tilted rieman |
75bd7f81 | 561 | // |
562 | Double_t uvt[6]; | |
ad670fba | 563 | Double_t x2 = cseed[iLayer].fX[itime] + cseed[iLayer].fX0; // Global x |
564 | Double_t t = 1.0 / (x2*x2 + y*y); | |
565 | uvt[1] = t; | |
566 | uvt[0] = 2.0 * x2 * uvt[1]; | |
567 | uvt[2] = 2.0 * tilt * uvt[1]; | |
568 | uvt[3] = 2.0 * tilt *uvt[1] * x; | |
569 | uvt[4] = 2.0 * (y + tilt * z) * uvt[1]; | |
570 | ||
571 | Double_t error = 2.0 * uvt[1]; | |
572 | if (terror) { | |
573 | error *= cseed[iLayer].fSigmaY; | |
574 | } | |
575 | else { | |
576 | error *= 0.2; //Default error | |
577 | } | |
75bd7f81 | 578 | fitterT2.AddPoint(uvt,uvt[4],error); |
579 | npointsT++; | |
ad670fba | 580 | |
75bd7f81 | 581 | } |
ad670fba | 582 | |
75bd7f81 | 583 | } |
ad670fba | 584 | |
75bd7f81 | 585 | fitterT2.Eval(); |
586 | Double_t rpolz0 = fitterT2.GetParameter(3); | |
587 | Double_t rpolz1 = fitterT2.GetParameter(4); | |
ad670fba | 588 | |
75bd7f81 | 589 | // |
ad670fba | 590 | // Linear fitter - not possible to make boundaries |
75bd7f81 | 591 | // non accept non possible z and dzdx combination |
592 | // | |
ad670fba | 593 | Bool_t acceptablez = kTRUE; |
594 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { | |
e4f2f73d | 595 | if (!cseed[iLayer].IsOK()) continue; |
596 | Double_t zT2 = rpolz0 + rpolz1 * (cseed[iLayer].fX0 - xref2); | |
597 | if (TMath::Abs(cseed[iLayer].fZProb - zT2) > cseed[iLayer].fPadLength * 0.5 + 1.0) acceptablez = kFALSE; | |
75bd7f81 | 598 | } |
ad670fba | 599 | if (!acceptablez) { |
600 | Double_t zmf = cseed[2].fZref[0] + cseed[2].fZref[1] * (xref2 - cseed[2].fX0); | |
601 | Double_t dzmf = (cseed[2].fZref[1] + cseed[3].fZref[1]) * 0.5; | |
75bd7f81 | 602 | fitterT2.FixParameter(3,zmf); |
603 | fitterT2.FixParameter(4,dzmf); | |
604 | fitterT2.Eval(); | |
605 | fitterT2.ReleaseParameter(3); | |
606 | fitterT2.ReleaseParameter(4); | |
607 | rpolz0 = fitterT2.GetParameter(3); | |
608 | rpolz1 = fitterT2.GetParameter(4); | |
609 | } | |
610 | ||
ad670fba | 611 | Double_t chi2TR = fitterT2.GetChisquare() / Float_t(npointsT); |
75bd7f81 | 612 | Double_t params[3]; |
ad670fba | 613 | params[0] = fitterT2.GetParameter(0); |
614 | params[1] = fitterT2.GetParameter(1); | |
615 | params[2] = fitterT2.GetParameter(2); | |
616 | Double_t curvature = 1.0 + params[1] * params[1] - params[2] * params[0]; | |
617 | ||
e4f2f73d | 618 | |
ad670fba | 619 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { |
ad670fba | 620 | Double_t x = cseed[iLayer].fX0; |
621 | Double_t y = 0; | |
622 | Double_t dy = 0; | |
623 | Double_t z = 0; | |
624 | Double_t dz = 0; | |
625 | ||
75bd7f81 | 626 | // y |
ad670fba | 627 | Double_t res2 = (x * params[0] + params[1]); |
628 | res2 *= res2; | |
629 | res2 = 1.0 - params[2]*params[0] + params[1]*params[1] - res2; | |
630 | if (res2 >= 0) { | |
75bd7f81 | 631 | res2 = TMath::Sqrt(res2); |
ad670fba | 632 | y = (1.0 - res2) / params[0]; |
75bd7f81 | 633 | } |
ad670fba | 634 | |
75bd7f81 | 635 | //dy |
ad670fba | 636 | Double_t x0 = -params[1] / params[0]; |
637 | if (-params[2]*params[0] + params[1]*params[1] + 1 > 0) { | |
638 | Double_t rm1 = params[0] / TMath::Sqrt(-params[2]*params[0] + params[1]*params[1] + 1); | |
639 | if (1.0/(rm1*rm1) - (x-x0) * (x-x0) > 0.0) { | |
60e55aee | 640 | Double_t res = (x - x0) / TMath::Sqrt((1./rm1-(x-x0))*(1./rm1+(x-x0))); |
e4f2f73d | 641 | if (params[0] < 0) res *= -1.0; |
642 | dy = res; | |
75bd7f81 | 643 | } |
644 | } | |
ad670fba | 645 | z = rpolz0 + rpolz1 * (x - xref2); |
75bd7f81 | 646 | dz = rpolz1; |
647 | cseed[iLayer].fYref[0] = y; | |
648 | cseed[iLayer].fYref[1] = dy; | |
649 | cseed[iLayer].fZref[0] = z; | |
650 | cseed[iLayer].fZref[1] = dz; | |
ad670fba | 651 | cseed[iLayer].fC = curvature; |
75bd7f81 | 652 | |
653 | } | |
654 | ||
655 | return chi2TR; | |
656 | ||
657 | } |