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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 | // Class to the track points on the Riemann sphere. Inputs are | |
21 | // the set of id's (volids) of the volumes in which residuals are | |
22 | // calculated to construct a chi2 function to be minimized during | |
23 | // the alignment procedures. For the moment the track extrapolation is | |
24 | // taken at the space-point reference plane. The reference plane is | |
25 | // found using the covariance matrix of the point | |
26 | // (assuming sigma(x)=0 at the reference coordinate system. | |
27 | // | |
28 | // Internal usage of AliRieman class for minimization | |
29 | // | |
30 | ////////////////////////////////////////////////////////////////////////////// | |
31 | ||
32 | #include <TArrayI.h> | |
33 | #include <TLinearFitter.h> | |
34 | #include <TMath.h> | |
35 | #include <TMatrixD.h> | |
36 | #include <TMatrixDSym.h> | |
37 | #include <TRandom.h> | |
38 | #include <TTreeStream.h> | |
39 | ||
40 | #include "AliLog.h" | |
41 | #include "AliLog.h" | |
42 | #include "AliRieman.h" | |
43 | #include "AliTrackFitterRieman.h" | |
44 | ||
45 | ClassImp(AliTrackFitterRieman) | |
46 | ||
47 | ||
48 | AliTrackFitterRieman::AliTrackFitterRieman(): | |
49 | AliTrackFitter(), | |
50 | fBCorrection(kFALSE), | |
51 | fAlpha(0.), | |
52 | fNUsed(0), | |
53 | fConv(kFALSE), | |
54 | fMaxDelta(3), | |
55 | fRieman(new AliRieman(10000)), // allocate rieman | |
56 | fMinPointRadius(2.), | |
57 | fMaxPointRadius(500.), | |
58 | fDebugStream(new TTreeSRedirector("RiemanAlignDebug.root")) | |
59 | { | |
60 | // | |
61 | // default constructor | |
62 | // | |
63 | } | |
64 | ||
65 | ||
66 | AliTrackFitterRieman::AliTrackFitterRieman(AliTrackPointArray *array, Bool_t owner): | |
67 | AliTrackFitter(array,owner), | |
68 | fBCorrection(kFALSE), | |
69 | fAlpha(0.), | |
70 | fNUsed(0), | |
71 | fConv(kFALSE), | |
72 | fMaxDelta(3), | |
73 | fRieman(new AliRieman(10000)), //allocate rieman | |
74 | fMinPointRadius(2.), | |
75 | fMaxPointRadius(500.), | |
76 | fDebugStream(0) | |
77 | { | |
78 | // | |
79 | // Constructor | |
80 | // | |
81 | if (AliLog::GetDebugLevel("","AliTrackFitterRieman")) fDebugStream = new TTreeSRedirector("RiemanAlignDebug.root"); | |
82 | } | |
83 | ||
84 | AliTrackFitterRieman::AliTrackFitterRieman(const AliTrackFitterRieman &rieman): | |
85 | AliTrackFitter(rieman), | |
86 | fBCorrection(rieman.fBCorrection), | |
87 | fAlpha(rieman.fAlpha), | |
88 | fNUsed(rieman.fNUsed), | |
89 | fConv(rieman.fConv), | |
90 | fMaxDelta(rieman.fMaxDelta), | |
91 | fRieman(new AliRieman(*(rieman.fRieman))), | |
92 | fMinPointRadius(rieman.fMinPointRadius), | |
93 | fMaxPointRadius(rieman.fMaxPointRadius), | |
94 | fDebugStream(0) | |
95 | { | |
96 | // | |
97 | // copy constructor | |
98 | // | |
99 | if (AliLog::GetDebugLevel("","AliTrackFitterRieman")) fDebugStream = new TTreeSRedirector("RiemanAlignDebug.root"); | |
100 | } | |
101 | ||
102 | //_____________________________________________________________________________ | |
103 | AliTrackFitterRieman &AliTrackFitterRieman::operator =(const AliTrackFitterRieman& rieman) | |
104 | { | |
105 | // | |
106 | // Assignment operator | |
107 | // | |
108 | if(this==&rieman) return *this; | |
109 | ((AliTrackFitter *)this)->operator=(rieman); | |
110 | ||
111 | fBCorrection = rieman.fBCorrection; | |
112 | fAlpha = rieman.fAlpha; | |
113 | fNUsed = rieman.fNUsed; | |
114 | fConv = rieman.fConv; | |
115 | fMaxDelta = rieman.fMaxDelta; | |
116 | fRieman = new AliRieman(*(rieman.fRieman)); | |
117 | fMinPointRadius = rieman.fMinPointRadius; | |
118 | fMaxPointRadius = rieman.fMaxPointRadius; | |
119 | fDebugStream = 0; | |
120 | if (AliLog::GetDebugLevel("","AliTrackFitterRieman")) fDebugStream = new TTreeSRedirector("RiemanAlignDebug.root"); | |
121 | return *this; | |
122 | } | |
123 | ||
124 | ||
125 | AliTrackFitterRieman::~AliTrackFitterRieman(){ | |
126 | // | |
127 | // | |
128 | // | |
129 | delete fRieman; | |
130 | delete fDebugStream; | |
131 | } | |
132 | ||
133 | void AliTrackFitterRieman::Reset() | |
134 | { | |
135 | // Reset the track parameters and | |
136 | // rieman sums | |
137 | // | |
138 | AliTrackFitter::Reset(); | |
139 | fRieman->Reset(); | |
140 | fAlpha = 0.; | |
141 | fNUsed = 0; | |
142 | fConv =kFALSE; | |
143 | } | |
144 | ||
145 | Bool_t AliTrackFitterRieman::Fit(const TArrayI *volIds,const TArrayI *volIdsFit, | |
146 | AliGeomManager::ELayerID layerRangeMin, | |
147 | AliGeomManager::ELayerID layerRangeMax) | |
148 | { | |
149 | // Fit the track points. The method takes as an input | |
150 | // the set of id's (volids) of the volumes in which | |
151 | // one wants to calculate the residuals. | |
152 | // The following parameters are used to define the | |
153 | // range of volumes to be used in the fitting | |
154 | // As a result two AliTrackPointArray's obects are filled. | |
155 | // The first one contains the space points with | |
156 | // volume id's from volids list. The second array of points represents | |
157 | // the track extrapolations corresponding to the space points | |
158 | // in the first array. The two arrays can be used to find | |
159 | // the residuals in the volids and consequently construct a | |
160 | // chi2 function to be minimized during the alignment | |
161 | // procedures. For the moment the track extrapolation is taken | |
162 | // at the space-point reference plane. The reference plane is | |
163 | // found using the covariance matrix of the point | |
164 | // (assuming sigma(x)=0 at the reference coordinate system. | |
165 | Int_t debugLevel = AliLog::GetDebugLevel("","AliTrackFitterRieman"); | |
166 | ||
167 | // Float_t debugRatio = 1./(1.+debugLevel); | |
168 | Float_t debugRatio = debugLevel? 1.0/debugLevel : 1.0; | |
169 | ||
170 | Int_t npoints = fPoints->GetNPoints(); | |
171 | if ( npoints<fMinNPoints) return kFALSE; | |
172 | // | |
173 | // fast count points | |
174 | if (volIdsFit != 0x0) { | |
175 | Int_t countFit = 0; | |
176 | Int_t countPoint = 0; | |
177 | for (Int_t ipoint = 0; ipoint < npoints; ipoint++) { | |
178 | if (FindVolId(volIds,fPoints->GetVolumeID()[ipoint])) | |
179 | countPoint++; | |
180 | if (volIdsFit != 0x0) { | |
181 | if (FindVolId(volIdsFit,fPoints->GetVolumeID()[ipoint])) | |
182 | countFit++; | |
183 | } | |
184 | } | |
185 | if (countPoint==0) return kFALSE; | |
186 | if ((countFit<fMinNPoints) && (volIdsFit != 0x0)) return kFALSE; | |
187 | } | |
188 | // | |
189 | ||
190 | Reset(); | |
191 | ||
192 | if (fPoints && AliLog::GetDebugLevel("","AliTrackFitterRieman")>1&& gRandom->Rndm()<debugRatio){ | |
193 | Int_t nVol = volIds->GetSize(); | |
194 | Int_t nVolFit = volIdsFit->GetSize(); | |
195 | Int_t volId = volIds->At(0); | |
196 | (*fDebugStream)<<"PInput"<< | |
197 | "NPoints="<<npoints<< // number of points | |
198 | "VolId="<<volId<< // first vol ID | |
199 | "NVol="<<nVol<< // number of volumes | |
200 | "NvolFit="<<nVolFit<< // number of volumes to fit | |
201 | "fPoints.="<<fPoints<< // input points | |
202 | "\n"; | |
203 | } | |
204 | ||
205 | Bool_t isAlphaCalc = kFALSE; | |
206 | AliTrackPoint p,plocal; | |
207 | // fPoints->GetPoint(p,0); | |
208 | // fAlpha = TMath::ATan2(p.GetY(),p.GetX()); | |
209 | ||
210 | Int_t npVolId = 0; | |
211 | fNUsed = 0; | |
212 | Int_t *pindex = new Int_t[npoints]; | |
213 | for (Int_t ipoint = 0; ipoint < npoints; ipoint++) | |
214 | { | |
215 | fPoints->GetPoint(p,ipoint); | |
216 | UShort_t iVolId = p.GetVolumeID(); | |
217 | if (FindVolId(volIds,iVolId)) { | |
218 | pindex[npVolId] = ipoint; | |
219 | npVolId++; | |
220 | } | |
221 | if (volIdsFit != 0x0) { | |
222 | if (!FindVolId(volIdsFit,iVolId)) continue; | |
223 | } | |
224 | else { | |
225 | if (iVolId < AliGeomManager::LayerToVolUID(layerRangeMin,0) || | |
226 | iVolId > AliGeomManager::LayerToVolUID(layerRangeMax, | |
227 | AliGeomManager::LayerSize(layerRangeMax))) continue; | |
228 | } | |
229 | if (!isAlphaCalc) { | |
230 | fAlpha = p.GetAngle(); | |
231 | isAlphaCalc = kTRUE; | |
232 | } | |
233 | plocal = p.Rotate(fAlpha); | |
234 | if (TMath::Abs(plocal.GetX())>fMaxPointRadius || TMath::Abs(plocal.GetX())<fMinPointRadius || plocal.GetCov()[3]<=0 ||plocal.GetCov()[5]<=0 ){ | |
235 | printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<</n"); | |
236 | p.Dump(); | |
237 | plocal.Dump(); | |
238 | printf("Problematic point\n"); | |
239 | printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<</n"); | |
240 | }else{ | |
241 | AddPoint(plocal.GetX(),plocal.GetY(),plocal.GetZ(), | |
242 | TMath::Sqrt(plocal.GetCov()[3]),TMath::Sqrt(plocal.GetCov()[5])); | |
243 | } | |
244 | // fNUsed++; AddPoint should be responsible | |
245 | } | |
246 | ||
247 | if (npVolId == 0 || fNUsed < fMinNPoints) { | |
248 | delete [] pindex; | |
249 | return kFALSE; | |
250 | } | |
251 | ||
252 | Update(); | |
253 | ||
254 | if (!fConv) { | |
255 | delete [] pindex; | |
256 | return kFALSE; | |
257 | } | |
258 | ||
259 | if ((fParams[0] == 0) || | |
260 | ((-fParams[2]*fParams[0]+fParams[1]*fParams[1]+1) <= 0)) { | |
261 | delete [] pindex; | |
262 | return kFALSE; | |
263 | } | |
264 | ||
265 | ||
266 | if (fNUsed < fMinNPoints) { | |
267 | delete [] pindex; | |
268 | return kFALSE; | |
269 | } | |
270 | ||
271 | fPVolId = new AliTrackPointArray(npVolId); | |
272 | fPTrack = new AliTrackPointArray(npVolId); | |
273 | AliTrackPoint p2; | |
274 | for (Int_t ipoint = 0; ipoint < npVolId; ipoint++) | |
275 | { | |
276 | Int_t index = pindex[ipoint]; | |
277 | fPoints->GetPoint(p,index); | |
278 | if (GetPCA(p,p2) && ( | |
279 | TMath::Abs(p.GetX()-p2.GetX())<fMaxDelta && | |
280 | TMath::Abs(p.GetY()-p2.GetY())<fMaxDelta && | |
281 | TMath::Abs(p.GetZ()-p2.GetZ())<fMaxDelta | |
282 | )) { | |
283 | Float_t xyz[3],xyz2[3]; | |
284 | p.GetXYZ(xyz); p2.GetXYZ(xyz2); | |
285 | // printf("residuals %f %d %d %f %f %f %f %f %f\n",fChi2,fNUsed,fConv,xyz[0],xyz[1],xyz[2],xyz2[0]-xyz[0],xyz2[1]-xyz[1],xyz2[2]-xyz[2]); | |
286 | fPVolId->AddPoint(ipoint,&p); | |
287 | fPTrack->AddPoint(ipoint,&p2); | |
288 | }else{ | |
289 | // what should be default bahavior - | |
290 | delete [] pindex; | |
291 | delete fPVolId; | |
292 | delete fPTrack; | |
293 | fPVolId =0; | |
294 | fPTrack =0; | |
295 | return kFALSE; | |
296 | } | |
297 | } | |
298 | ||
299 | if (AliLog::GetDebugLevel("","AliTrackFitterRieman")>0 && gRandom->Rndm()<debugRatio){ | |
300 | // | |
301 | // Debug Info | |
302 | // | |
303 | AliTrackPointArray *lPVolId = new AliTrackPointArray(npVolId); | |
304 | AliTrackPointArray *lPTrack = new AliTrackPointArray(npVolId); | |
305 | AliTrackPointArray *lPTrackE = new AliTrackPointArray(npVolId); | |
306 | AliRieman * residual = fRieman->MakeResiduals(); | |
307 | for (Int_t ipoint = 0; ipoint < npVolId; ipoint++){ | |
308 | AliTrackPoint p0, p0local; | |
309 | AliTrackPoint pFit, pFitlocal, pFitLocalE; | |
310 | fPVolId->GetPoint(p0,ipoint); | |
311 | Float_t lAngle = p0.GetAngle(); | |
312 | p0local= p0.MasterToLocal(); | |
313 | fPTrack->GetPoint(pFit,ipoint); | |
314 | pFitlocal= pFit.Rotate(lAngle); | |
315 | // | |
316 | Float_t xyz[3], cov[6]; | |
317 | xyz[0] = pFitlocal.GetX(); | |
318 | xyz[1] = pFitlocal.GetY(); | |
319 | xyz[2] = pFitlocal.GetZ(); | |
320 | for (Int_t icov=0; icov<6; icov++) cov[icov]=0; | |
321 | cov[3] = GetErrY2at(xyz[0]); | |
322 | cov[5] = GetErrZ2at(xyz[0]); | |
323 | pFitLocalE.SetXYZ(xyz,cov); | |
324 | // | |
325 | lPVolId->AddPoint(ipoint,&p0local); | |
326 | lPTrack->AddPoint(ipoint,&pFitlocal); | |
327 | lPTrackE->AddPoint(ipoint,&pFitLocalE); | |
328 | } | |
329 | // | |
330 | // debug info | |
331 | // | |
332 | Int_t nVol = volIds->GetSize(); | |
333 | Int_t nVolFit = volIdsFit->GetSize(); | |
334 | Int_t volId = volIds->At(0); | |
335 | Int_t modId =0; | |
336 | Int_t layer = AliGeomManager::VolUIDToLayer(volId,modId); | |
337 | Int_t volIdFit = volIdsFit->At(0); | |
338 | Int_t modIdFit =0; | |
339 | Int_t layerFit = AliGeomManager::VolUIDToLayer(volIdFit,modIdFit); | |
340 | ||
341 | (*fDebugStream)<<"Fit"<< | |
342 | "VolId="<<volId<< // volume ID | |
343 | "Layer="<<layer<< // layer ID | |
344 | "Module="<<modId<< // module ID | |
345 | "LayerFit="<<layerFit<< // layer ID fit | |
346 | "ModuleFit="<<modIdFit<< // module ID fit | |
347 | "NVol="<<nVol<< // number of volumes | |
348 | "NvolFit="<<nVolFit<< // number of volumes to fit | |
349 | "Points0.="<<fPVolId<< // original points | |
350 | "Points1.="<<fPTrack<< // fitted points | |
351 | "LPoints0.="<<lPVolId<< // original points - local frame | |
352 | "LPoints1.="<<lPTrack<< // fitted points - local frame | |
353 | "LPointsE.="<<lPTrackE<< // fitted points with ext error - local frame | |
354 | "Rieman.="<<this<< // original rieman fit | |
355 | "Res.="<<residual<< // residuals of rieman fit | |
356 | "\n"; | |
357 | delete lPVolId; | |
358 | delete lPTrack; | |
359 | delete residual; | |
360 | } | |
361 | ||
362 | delete [] pindex; | |
363 | return kTRUE; | |
364 | } | |
365 | ||
366 | ||
367 | void AliTrackFitterRieman::AddPoint(Float_t x, Float_t y, Float_t z, Float_t sy, Float_t sz) | |
368 | { | |
369 | // | |
370 | // add point to rieman fitter | |
371 | // | |
372 | fRieman->AddPoint(x,y,z,sy,sz); | |
373 | fNUsed = fRieman->GetN(); | |
374 | } | |
375 | ||
376 | ||
377 | ||
378 | Bool_t AliTrackFitterRieman::Update(){ | |
379 | // | |
380 | // | |
381 | // | |
382 | fRieman->Update(); | |
383 | fConv = kFALSE; | |
384 | if (fRieman->IsValid()){ | |
385 | for (Int_t ipar=0; ipar<6; ipar++){ | |
386 | fParams[ipar] = fRieman->GetParam()[ipar]; | |
387 | } | |
388 | fChi2 = fRieman->GetChi2(); | |
389 | fNdf = fRieman->GetN()- 2; | |
390 | fNUsed = fRieman->GetN(); | |
391 | fConv = kTRUE; | |
392 | } | |
393 | // | |
394 | // | |
395 | // | |
396 | TLinearFitter fitY(3,"pol2"); | |
397 | TLinearFitter fitZ(3,"pol2"); | |
398 | for (Int_t ip=0; ip<fRieman->GetN();ip++){ | |
399 | Double_t x = fRieman->GetX()[ip]; | |
400 | fitY.AddPoint(&x,fRieman->GetY()[ip]-fRieman->GetYat(x),1); | |
401 | fitZ.AddPoint(&x,fRieman->GetZ()[ip]-fRieman->GetZat(x),1); | |
402 | } | |
403 | fitY.Eval(); | |
404 | fitZ.Eval(); | |
405 | for (Int_t iparam=0; iparam<3; iparam++){ | |
406 | fCorrY[iparam]=fitY.GetParameter(iparam); | |
407 | fCorrZ[iparam]=fitZ.GetParameter(iparam); | |
408 | } | |
409 | fCorrY[3]=fitY.GetChisquare()/Float_t(fRieman->GetN()-3); | |
410 | fCorrZ[3]=fitZ.GetChisquare()/Float_t(fRieman->GetN()-3); | |
411 | ||
412 | return kTRUE; | |
413 | } | |
414 | ||
415 | ||
416 | ||
417 | //_____________________________________________________________________________ | |
418 | Bool_t AliTrackFitterRieman::GetPCA(const AliTrackPoint &p, AliTrackPoint &p2) const | |
419 | { | |
420 | // | |
421 | // Get the closest to a given spacepoint track trajectory point | |
422 | // Look for details in the description of the Fit() method | |
423 | // | |
424 | if (!fConv) return kFALSE; | |
425 | ||
426 | // First X and Y coordinates | |
427 | Double_t sin = TMath::Sin(fAlpha); | |
428 | Double_t cos = TMath::Cos(fAlpha); | |
429 | // fParam[0] = 1/y0 | |
430 | // fParam[1] = -x0/y0 | |
431 | // fParam[2] = - (R^2 - x0^2 - y0^2)/y0 | |
432 | if (fParams[0] == 0) return kFALSE; | |
433 | // Track parameters in the global coordinate system | |
434 | Double_t x0 = -fParams[1]/fParams[0]*cos - 1./fParams[0]*sin; | |
435 | Double_t y0 = 1./fParams[0]*cos - fParams[1]/fParams[0]*sin; | |
436 | if ((-fParams[2]*fParams[0]+fParams[1]*fParams[1]+1) <= 0) return kFALSE; | |
437 | Double_t r = TMath::Sqrt(-fParams[2]*fParams[0]+fParams[1]*fParams[1]+1)/ | |
438 | fParams[0]; | |
439 | ||
440 | // Define space-point refence plane | |
441 | Double_t alphap = p.GetAngle(); | |
442 | Double_t sinp = TMath::Sin(alphap); | |
443 | Double_t cosp = TMath::Cos(alphap); | |
444 | Double_t x = p.GetX()*cosp + p.GetY()*sinp; | |
445 | Double_t y = p.GetY()*cosp - p.GetX()*sinp; | |
446 | Double_t x0p= x0*cosp + y0*sinp; | |
447 | Double_t y0p= y0*cosp - x0*sinp; | |
448 | if ((r*r - (x-x0p)*(x-x0p))<0) { | |
449 | AliWarning(Form("Track extrapolation failed ! (Track radius = %f, track circle x = %f, space-point x = %f, reference plane angle = %f\n",r,x0p,x,alphap)); | |
450 | return kFALSE; | |
451 | } | |
452 | Double_t temp = TMath::Sqrt(r*r - (x-x0p)*(x-x0p)); | |
453 | Double_t y1 = y0p + temp; | |
454 | Double_t y2 = y0p - temp; | |
455 | Double_t yprime = y1; | |
456 | if(TMath::Abs(y2-y) < TMath::Abs(y1-y)) yprime = y2; | |
457 | ||
458 | // Back to the global coordinate system | |
459 | Double_t xsecond = x*cosp - yprime*sinp; | |
460 | Double_t ysecond = yprime*cosp + x*sinp; | |
461 | ||
462 | // Now Z coordinate and track angles | |
463 | Double_t x2 = xsecond*cos + ysecond*sin; | |
464 | Double_t zsecond = GetZat(x2); | |
465 | Double_t dydx = GetDYat(x2); | |
466 | Double_t dzdx = GetDZat(x2); | |
467 | ||
468 | // Fill the cov matrix of the track extrapolation point | |
469 | Double_t cov[6] = {0,0,0,0,0,0}; | |
470 | Double_t sigmax = 100*100.; | |
471 | cov[0] = sigmax; cov[1] = sigmax*dydx; cov[2] = sigmax*dzdx; | |
472 | cov[3] = sigmax*dydx*dydx; cov[4] = sigmax*dydx*dzdx; | |
473 | cov[5] = sigmax*dzdx*dzdx; | |
474 | ||
475 | Double_t sigmay2 = GetErrY2at(x2); | |
476 | Double_t sigmaz2 = GetErrZ2at(x2); | |
477 | cov[3] += sigmay2; | |
478 | cov[5] += sigmaz2; | |
479 | ||
480 | ||
481 | Float_t newcov[6]; | |
482 | newcov[0] = cov[0]*cos*cos- | |
483 | 2*cov[1]*sin*cos+ | |
484 | cov[3]*sin*sin; | |
485 | newcov[1] = cov[1]*(cos*cos-sin*sin)- | |
486 | (cov[3]-cov[0])*sin*cos; | |
487 | newcov[2] = cov[2]*cos- | |
488 | cov[4]*sin; | |
489 | newcov[3] = cov[0]*sin*sin+ | |
490 | 2*cov[1]*sin*cos+ | |
491 | cov[3]*cos*cos; | |
492 | newcov[4] = cov[4]*cos+ | |
493 | cov[2]*sin; | |
494 | newcov[5] = cov[5]; | |
495 | ||
496 | p2.SetXYZ(xsecond,ysecond,zsecond,newcov); | |
497 | Int_t debugLevel = AliLog::GetDebugLevel("","AliTrackFitterRieman"); | |
498 | Float_t debugRatio = 1./(1.+debugLevel); | |
499 | if (AliLog::GetDebugLevel("","AliTrackFitterRieman")>0 && gRandom->Rndm()<debugRatio){ | |
500 | AliTrackPoint lp0(p); | |
501 | AliTrackPoint lp2(p2); | |
502 | AliTrackPoint localp0(p); | |
503 | AliTrackPoint localp2(p2); | |
504 | Float_t lAngle = lp0.GetAngle(); | |
505 | localp0 = localp0.Rotate(lAngle); | |
506 | localp2 = localp2.Rotate(lAngle); | |
507 | ||
508 | (*fDebugStream)<<"PCA"<< | |
509 | "P0.="<<&lp0<< //global position | |
510 | "P2.="<<&lp2<< | |
511 | "LP0.="<<&localp0<< //local position | |
512 | "LP2.="<<&localp2<< | |
513 | "\n"; | |
514 | } | |
515 | return kTRUE; | |
516 | } | |
517 | ||
518 | Double_t AliTrackFitterRieman::GetYat(Double_t x) const { | |
519 | // | |
520 | // get y position at given point | |
521 | // | |
522 | Double_t correction=0; | |
523 | if (fBCorrection){ // systematic effect correction | |
524 | correction = fCorrY[0]+fCorrY[1]*x +fCorrY[2]*x*x; | |
525 | } | |
526 | return fRieman->GetYat(x)+correction; | |
527 | } | |
528 | ||
529 | Double_t AliTrackFitterRieman::GetZat(Double_t x) const { | |
530 | // | |
531 | // get z position at given point | |
532 | // | |
533 | Double_t correction=0; | |
534 | if (fBCorrection){ // systematic effect correction | |
535 | correction = fCorrZ[0]+fCorrZ[1]*x +fCorrZ[2]*x*x; | |
536 | } | |
537 | return fRieman->GetZat(x)+correction; | |
538 | } | |
539 | ||
540 | Double_t AliTrackFitterRieman::GetErrY2at(Double_t x) const { | |
541 | // | |
542 | // get estimate of extrapolation error | |
543 | // | |
544 | Double_t error = fRieman->GetErrY(x); | |
545 | Double_t correction=0; | |
546 | if (fBCorrection){ // everestimate error due systematic effect | |
547 | error *=fCorrY[3]; | |
548 | correction = fCorrY[0]+fCorrY[1]*x +fCorrY[2]*x*x; | |
549 | correction *=correction; | |
550 | } | |
551 | return TMath::Sqrt(error+correction); | |
552 | } | |
553 | ||
554 | Double_t AliTrackFitterRieman::GetErrZ2at(Double_t x) const { | |
555 | // | |
556 | // get estimate of extrapolation error | |
557 | // | |
558 | Double_t error = fRieman->GetErrZ(x)*fCorrZ[3]; | |
559 | Double_t correction=0; | |
560 | if (fBCorrection){ | |
561 | error *= fCorrZ[3]; | |
562 | correction = fCorrZ[0]+fCorrZ[1]*x +fCorrZ[2]*x*x; | |
563 | correction*= correction; | |
564 | } | |
565 | return TMath::Sqrt(error+correction); | |
566 | } | |
567 | ||
568 | void AliTrackFitterRieman::SetParam(Int_t i, Double_t par) { | |
569 | if (i<0 || i>5) return; | |
570 | fParams[i]=par; | |
571 | fRieman->GetParam()[i]=par; | |
572 | } |