ITS/AliITSClusterFinderSDD.cxx

   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   $Log$
  18   Revision 1.35  2003/11/10 16:33:50  masera
  19   Changes to obey our coding conventions
  20
  21   Revision 1.34  2003/09/11 13:48:52  masera
  22   Data members of AliITSdigit classes defined as protected (They were public)
  23
  24   Revision 1.33  2003/07/21 14:20:51  masera
  25   Fix to track labes in SDD Rec-points
  26
  27   Revision 1.31.2.1  2003/07/16 13:18:04  masera
  28   Proper fix to track labels associated to SDD rec-points
  29
  30   Revision 1.31  2003/05/19 14:44:41  masera
  31   Fix to track labels associated to SDD rec-points
  32
  33   Revision 1.30  2003/03/03 16:34:35  masera
  34   Corrections to comply with coding conventions
  35
  36   Revision 1.29  2002/10/25 18:54:22  barbera
  37   Various improvements and updates from B.S.Nilsen and T. Virgili
  38
  39   Revision 1.28  2002/10/22 14:45:29  alibrary
  40   Introducing Riostream.h
  41
  42   Revision 1.27  2002/10/14 14:57:00  hristov
  43   Merging the VirtualMC branch to the main development branch (HEAD)
  44
  45   Revision 1.23.4.2  2002/10/14 13:14:07  hristov
  46   Updating VirtualMC to v3-09-02
  47
  48   Revision 1.26  2002/09/09 17:23:28  nilsen
  49   Minor changes in support of changes to AliITSdigitS?D class'.
  50
  51   Revision 1.25  2002/05/10 22:29:40  nilsen
  52   Change my Massimo Masera in the default constructor to bring things into
  53   compliance.
  54
  55   Revision 1.24  2002/04/24 22:02:31  nilsen
  56   New SDigits and Digits routines, and related changes,  (including new
  57   noise values).
  58
  59  */
  60 //
  61 //  Cluster finder
  62 //  for Silicon
  63 //  Drift Detector
  64 //
  65 #include <Riostream.h>
  66
  67 #include <TMath.h>
  68 #include <math.h>
  69
  70 #include "AliITSClusterFinderSDD.h"
  71 #include "AliITSMapA1.h"
  72 #include "AliITS.h"
  73 #include "AliITSdigitSDD.h"
  74 #include "AliITSRawClusterSDD.h"
  75 #include "AliITSRecPoint.h"
  76 #include "AliITSsegmentation.h"
  77 #include "AliITSresponseSDD.h"
  78 #include "AliRun.h"
  79
  80 ClassImp(AliITSClusterFinderSDD)
  81
  82 //______________________________________________________________________
  83 AliITSClusterFinderSDD::AliITSClusterFinderSDD(AliITSsegmentation *seg,
  84                                                AliITSresponse *response,
  85                                                TClonesArray *digits,
  86                                                TClonesArray *recp){
  87     // standard constructor
  88
  89     fSegmentation = seg;
  90     fResponse     = response;
  91     fDigits       = digits;
  92     fClusters     = recp;
  93     fNclusters    = fClusters->GetEntriesFast();
  94     SetCutAmplitude();
  95     SetDAnode();
  96     SetDTime();
  97     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
  98     //    SetMinPeak();
  99     SetMinNCells();
 100     SetMaxNCells();
 101     SetTimeCorr();
 102     SetMinCharge();
 103     fMap = new AliITSMapA1(fSegmentation,fDigits,fCutAmplitude);
 104 }
 105 //______________________________________________________________________
 106 AliITSClusterFinderSDD::AliITSClusterFinderSDD(){
 107     // default constructor
 108
 109     fSegmentation = 0;
 110     fResponse     = 0;
 111     fDigits       = 0;
 112     fClusters     = 0;
 113     fNclusters    = 0;
 114     fMap          = 0;
 115     fCutAmplitude = 0;
 116     fDAnode = 0;
 117     fDTime = 0;
 118     fMinPeak = 0;
 119     fMinNCells = 0;
 120     fMaxNCells = 0;
 121     fTimeCorr = 0;
 122     fMinCharge = 0;
 123     /*
 124     SetDAnode();
 125     SetDTime();
 126     SetMinPeak((Int_t)(((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics()*5));
 127     SetMinNCells();
 128     SetMaxNCells();
 129     SetTimeCorr();
 130     SetMinCharge();
 131     */
 132 }
 133 //____________________________________________________________________________
 134 AliITSClusterFinderSDD::~AliITSClusterFinderSDD(){
 135     // destructor
 136
 137     if(fMap) delete fMap;
 138 }
 139 //______________________________________________________________________
 140 void AliITSClusterFinderSDD::SetCutAmplitude(Float_t nsigma){
 141     // set the signal threshold for cluster finder
 142     Float_t baseline,noise,noiseAfterEl;
 143
 144     fResponse->GetNoiseParam(noise,baseline);
 145     noiseAfterEl = ((AliITSresponseSDD*)fResponse)->GetNoiseAfterElectronics();
 146     fCutAmplitude = (Int_t)((baseline + nsigma*noiseAfterEl));
 147 }
 148 //______________________________________________________________________
 149 void AliITSClusterFinderSDD::Find1DClusters(){
 150     // find 1D clusters
 151     static AliITS *iTS = (AliITS*)gAlice->GetModule("ITS");
 152
 153     // retrieve the parameters
 154     Int_t fNofMaps       = fSegmentation->Npz();
 155     Int_t fMaxNofSamples = fSegmentation->Npx();
 156     Int_t fNofAnodes     = fNofMaps/2;
 157     Int_t dummy          = 0;
 158     Float_t fTimeStep    = fSegmentation->Dpx(dummy);
 159     Float_t fSddLength   = fSegmentation->Dx();
 160     Float_t fDriftSpeed  = fResponse->DriftSpeed();
 161     Float_t anodePitch   = fSegmentation->Dpz(dummy);
 162
 163     // map the signal
 164     fMap->ClearMap();
 165     fMap->SetThreshold(fCutAmplitude);
 166     fMap->FillMap();
 167
 168     Float_t noise;
 169     Float_t baseline;
 170     fResponse->GetNoiseParam(noise,baseline);
 171
 172     Int_t nofFoundClusters = 0;
 173     Int_t i;
 174     Float_t **dfadc = new Float_t*[fNofAnodes];
 175     for(i=0;i<fNofAnodes;i++) dfadc[i] = new Float_t[fMaxNofSamples];
 176     Float_t fadc  = 0.;
 177     Float_t fadc1 = 0.;
 178     Float_t fadc2 = 0.;
 179     Int_t j,k,idx,l,m;
 180     for(j=0;j<2;j++) {
 181         for(k=0;k<fNofAnodes;k++) {
 182             idx = j*fNofAnodes+k;
 183             // signal (fadc) & derivative (dfadc)
 184             dfadc[k][255]=0.;
 185             for(l=0; l<fMaxNofSamples; l++) {
 186                 fadc2=(Float_t)fMap->GetSignal(idx,l);
 187                 if(l>0) fadc1=(Float_t)fMap->GetSignal(idx,l-1);
 188                 if(l>0) dfadc[k][l-1] = fadc2-fadc1;
 189             } // samples
 190         } // anodes
 191
 192         for(k=0;k<fNofAnodes;k++) {
 193         //cout << "Anode: " << k+1 << ", Wing: " << j+1 << endl;
 194             idx = j*fNofAnodes+k;
 195             Int_t imax  = 0;
 196             Int_t imaxd = 0;
 197             Int_t it    = 0;
 198             while(it <= fMaxNofSamples-3) {
 199                 imax  = it;
 200                 imaxd = it;
 201                 // maximum of signal
 202                 Float_t fadcmax  = 0.;
 203                 Float_t dfadcmax = 0.;
 204                 Int_t lthrmina   = 1;
 205                 Int_t lthrmint   = 3;
 206                 Int_t lthra      = 1;
 207                 Int_t lthrt      = 0;
 208                 for(m=0;m<20;m++) {
 209                     Int_t id = it+m;
 210                     if(id>=fMaxNofSamples) break;
 211                     fadc=(float)fMap->GetSignal(idx,id);
 212                     if(fadc > fadcmax) { fadcmax = fadc; imax = id;}
 213                     if(fadc > (float)fCutAmplitude) {
 214                         lthrt++;
 215                     } // end if
 216                     if(dfadc[k][id] > dfadcmax) {
 217                         dfadcmax = dfadc[k][id];
 218                         imaxd    = id;
 219                     } // end if
 220                 } // end for m
 221                 it = imaxd;
 222                 if(fMap->TestHit(idx,imax) == kEmpty) {it++; continue;}
 223                 // cluster charge
 224                 Int_t tstart = it-2;
 225                 if(tstart < 0) tstart = 0;
 226                 Bool_t ilcl = 0;
 227                 if(lthrt >= lthrmint && lthra >= lthrmina) ilcl = 1;
 228                 if(ilcl) {
 229                     nofFoundClusters++;
 230                     Int_t tstop      = tstart;
 231                     Float_t dfadcmin = 10000.;
 232                     Int_t ij;
 233                     for(ij=0; ij<20; ij++) {
 234                         if(tstart+ij > 255) { tstop = 255; break; }
 235                         fadc=(float)fMap->GetSignal(idx,tstart+ij);
 236                         if((dfadc[k][tstart+ij] < dfadcmin) &&
 237                            (fadc > fCutAmplitude)) {
 238                             tstop = tstart+ij+5;
 239                             if(tstop > 255) tstop = 255;
 240                             dfadcmin = dfadc[k][it+ij];
 241                         } // end if
 242                     } // end for ij
 243
 244                     Float_t clusterCharge = 0.;
 245                     Float_t clusterAnode  = k+0.5;
 246                     Float_t clusterTime   = 0.;
 247                     Int_t   clusterMult   = 0;
 248                     Float_t clusterPeakAmplitude = 0.;
 249                     Int_t its,peakpos     = -1;
 250                     Float_t n, baseline;
 251                     fResponse->GetNoiseParam(n,baseline);
 252                     for(its=tstart; its<=tstop; its++) {
 253                         fadc=(float)fMap->GetSignal(idx,its);
 254                         if(fadc>baseline) fadc -= baseline;
 255                         else fadc = 0.;
 256                         clusterCharge += fadc;
 257                         // as a matter of fact we should take the peak
 258                         // pos before FFT
 259                         // to get the list of tracks !!!
 260                         if(fadc > clusterPeakAmplitude) {
 261                             clusterPeakAmplitude = fadc;
 262                             //peakpos=fMap->GetHitIndex(idx,its);
 263                             Int_t shift = (int)(fTimeCorr/fTimeStep);
 264                             if(its>shift && its<(fMaxNofSamples-shift))
 265                                 peakpos  = fMap->GetHitIndex(idx,its+shift);
 266                             else peakpos = fMap->GetHitIndex(idx,its);
 267                             if(peakpos<0) peakpos =fMap->GetHitIndex(idx,its);
 268                         } // end if
 269                         clusterTime += fadc*its;
 270                         if(fadc > 0) clusterMult++;
 271                         if(its == tstop) {
 272                             clusterTime /= (clusterCharge/fTimeStep);   // ns
 273                             if(clusterTime>fTimeCorr) clusterTime -=fTimeCorr;
 274                             //ns
 275                         } // end if
 276                     } // end for its
 277
 278                     Float_t clusteranodePath = (clusterAnode - fNofAnodes/2)*
 279                                                anodePitch;
 280                     Float_t clusterDriftPath = clusterTime*fDriftSpeed;
 281                     clusterDriftPath = fSddLength-clusterDriftPath;
 282                     if(clusterCharge <= 0.) break;
 283                     AliITSRawClusterSDD clust(j+1,//i
 284                                               clusterAnode,clusterTime,//ff
 285                                               clusterCharge, //f
 286                                               clusterPeakAmplitude, //f
 287                                               peakpos, //i
 288                                               0.,0.,clusterDriftPath,//fff
 289                                               clusteranodePath, //f
 290                                               clusterMult, //i
 291                                               0,0,0,0,0,0,0);//7*i
 292                     iTS->AddCluster(1,&clust);
 293                     it = tstop;
 294                 } // ilcl
 295                 it++;
 296             } // while (samples)
 297         } // anodes
 298     } // detectors (2)
 299
 300     for(i=0;i<fNofAnodes;i++) delete[] dfadc[i];
 301     delete [] dfadc;
 302
 303     return;
 304 }
 305
 306
 307
 308 //______________________________________________________________________
 309 void AliITSClusterFinderSDD::Find1DClustersE(){
 310     // find 1D clusters
 311     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 312     // retrieve the parameters
 313     Int_t fNofMaps = fSegmentation->Npz();
 314     Int_t fMaxNofSamples = fSegmentation->Npx();
 315     Int_t fNofAnodes = fNofMaps/2;
 316     Int_t dummy=0;
 317     Float_t fTimeStep = fSegmentation->Dpx( dummy );
 318     Float_t fSddLength = fSegmentation->Dx();
 319     Float_t fDriftSpeed = fResponse->DriftSpeed();
 320     Float_t anodePitch = fSegmentation->Dpz( dummy );
 321     Float_t n, baseline;
 322     fResponse->GetNoiseParam( n, baseline );
 323     // map the signal
 324     fMap->ClearMap();
 325     fMap->SetThreshold( fCutAmplitude );
 326     fMap->FillMap();
 327
 328     Int_t nClu = 0;
 329     //        cout << "Search  cluster... "<< endl;
 330     for( Int_t j=0; j<2; j++ ){
 331         for( Int_t k=0; k<fNofAnodes; k++ ){
 332             Int_t idx = j*fNofAnodes+k;
 333             Bool_t on = kFALSE;
 334             Int_t start = 0;
 335             Int_t nTsteps = 0;
 336             Float_t fmax = 0.;
 337             Int_t lmax = 0;
 338             Float_t charge = 0.;
 339             Float_t time = 0.;
 340             Float_t anode = k+0.5;
 341             Int_t peakpos = -1;
 342             for( Int_t l=0; l<fMaxNofSamples; l++ ){
 343                 Float_t fadc = (Float_t)fMap->GetSignal( idx, l );
 344                 if( fadc > 0.0 ){
 345                     if( on == kFALSE && l<fMaxNofSamples-4){
 346                         // star RawCluster (reset var.)
 347                         Float_t fadc1 = (Float_t)fMap->GetSignal( idx, l+1 );
 348                         if( fadc1 < fadc ) continue;
 349                         start = l;
 350                         fmax = 0.;
 351                         lmax = 0;
 352                         time = 0.;
 353                         charge = 0.;
 354                         on = kTRUE;
 355                         nTsteps = 0;
 356                     } // end if on...
 357                     nTsteps++ ;
 358                     if( fadc > baseline ) fadc -= baseline;
 359                     else fadc=0.;
 360                     charge += fadc;
 361                     time += fadc*l;
 362                     if( fadc > fmax ){
 363                         fmax = fadc;
 364                         lmax = l;
 365                         Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 366                         if( l > shift && l < (fMaxNofSamples-shift) )
 367                             peakpos = fMap->GetHitIndex( idx, l+shift );
 368                         else
 369                             peakpos = fMap->GetHitIndex( idx, l );
 370                         if( peakpos < 0) peakpos = fMap->GetHitIndex( idx, l );
 371                     } // end if fadc
 372                 }else{ // end fadc>0
 373                     if( on == kTRUE ){
 374                         if( nTsteps > 2 ){
 375                             //  min # of timesteps for a RawCluster
 376                             // Found a RawCluster...
 377                             Int_t stop = l-1;
 378                             time /= (charge/fTimeStep);   // ns
 379                                 // time = lmax*fTimeStep;   // ns
 380                             if( time > fTimeCorr ) time -= fTimeCorr;   // ns
 381                             Float_t anodePath = (anode - fNofAnodes/2)*anodePitch;
 382                             Float_t driftPath = time*fDriftSpeed;
 383                             driftPath = fSddLength-driftPath;
 384                             AliITSRawClusterSDD clust(j+1,anode,time,charge,
 385                                                       fmax, peakpos,0.,0.,
 386                                                       driftPath,anodePath,
 387                                                       nTsteps,start,stop,
 388                                                       start, stop, 1, k, k );
 389                             iTS->AddCluster( 1, &clust );
 390                             //        clust.PrintInfo();
 391                             nClu++;
 392                         } // end if nTsteps
 393                         on = kFALSE;
 394                     } // end if on==kTRUE
 395                 } // end if fadc>0
 396             } // samples
 397         } // anodes
 398     } // wings
 399     //        cout << "# Rawclusters " << nClu << endl;
 400     return;
 401 }
 402 //_______________________________________________________________________
 403 Int_t AliITSClusterFinderSDD::SearchPeak(Float_t *spect,Int_t xdim,Int_t zdim,
 404                                          Int_t *peakX, Int_t *peakZ,
 405                                          Float_t *peakAmp, Float_t minpeak ){
 406     // search peaks on a 2D cluster
 407     Int_t npeak = 0;    // # peaks
 408     Int_t i,j;
 409     // search peaks
 410     for( Int_t z=1; z<zdim-1; z++ ){
 411         for( Int_t x=1; x<xdim-2; x++ ){
 412             Float_t sxz = spect[x*zdim+z];
 413             Float_t sxz1 = spect[(x+1)*zdim+z];
 414             Float_t sxz2 = spect[(x-1)*zdim+z];
 415             // search a local max. in s[x,z]
 416             if( sxz < minpeak || sxz1 <= 0 || sxz2 <= 0 ) continue;
 417             if( sxz >= spect[(x+1)*zdim+z  ] && sxz >= spect[(x-1)*zdim+z  ] &&
 418                 sxz >= spect[x*zdim    +z+1] && sxz >= spect[x*zdim    +z-1] &&
 419                 sxz >= spect[(x+1)*zdim+z+1] && sxz >= spect[(x+1)*zdim+z-1] &&
 420                 sxz >= spect[(x-1)*zdim+z+1] && sxz >= spect[(x-1)*zdim+z-1] ){
 421                 // peak found
 422                 peakX[npeak] = x;
 423                 peakZ[npeak] = z;
 424                 peakAmp[npeak] = sxz;
 425                 npeak++;
 426             } // end if ....
 427         } // end for x
 428     } // end for z
 429     // search groups of peaks with same amplitude.
 430     Int_t *flag = new Int_t[npeak];
 431     for( i=0; i<npeak; i++ ) flag[i] = 0;
 432     for( i=0; i<npeak; i++ ){
 433         for( j=0; j<npeak; j++ ){
 434             if( i==j) continue;
 435             if( flag[j] > 0 ) continue;
 436             if( peakAmp[i] == peakAmp[j] &&
 437                 TMath::Abs(peakX[i]-peakX[j])<=1 &&
 438                 TMath::Abs(peakZ[i]-peakZ[j])<=1 ){
 439                 if( flag[i] == 0) flag[i] = i+1;
 440                 flag[j] = flag[i];
 441             } // end if ...
 442         } // end for j
 443     } // end for i
 444     // make average of peak groups
 445     for( i=0; i<npeak; i++ ){
 446         Int_t nFlag = 1;
 447         if( flag[i] <= 0 ) continue;
 448         for( j=0; j<npeak; j++ ){
 449             if( i==j ) continue;
 450             if( flag[j] != flag[i] ) continue;
 451             peakX[i] += peakX[j];
 452             peakZ[i] += peakZ[j];
 453             nFlag++;
 454             npeak--;
 455             for( Int_t k=j; k<npeak; k++ ){
 456                 peakX[k] = peakX[k+1];
 457                 peakZ[k] = peakZ[k+1];
 458                 peakAmp[k] = peakAmp[k+1];
 459                 flag[k] = flag[k+1];
 460             } // end for k
 461             j--;
 462         } // end for j
 463         if( nFlag > 1 ){
 464             peakX[i] /= nFlag;
 465             peakZ[i] /= nFlag;
 466         } // end fi nFlag
 467     } // end for i
 468     delete [] flag;
 469     return( npeak );
 470 }
 471 //______________________________________________________________________
 472 void AliITSClusterFinderSDD::PeakFunc( Int_t xdim, Int_t zdim, Float_t *par,
 473                                        Float_t *spe, Float_t *integral){
 474     // function used to fit the clusters
 475     // par -> parameters..
 476     // par[0]  number of peaks.
 477     // for each peak i=1, ..., par[0]
 478     //                 par[i] = Ampl.
 479     //                 par[i+1] = xpos
 480     //                 par[i+2] = zpos
 481     //                 par[i+3] = tau
 482     //                 par[i+4] = sigma.
 483     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 484     const Int_t knParam = 5;
 485     Int_t npeak = (Int_t)par[0];
 486
 487     memset( spe, 0, sizeof( Float_t )*zdim*xdim );
 488
 489     Int_t k = 1;
 490     for( Int_t i=0; i<npeak; i++ ){
 491         if( integral != 0 ) integral[i] = 0.;
 492         Float_t sigmaA2 = par[k+4]*par[k+4]*2.;
 493         Float_t t2 = par[k+3];   // PASCAL
 494         if( electronics == 2 ) { t2 *= t2; t2 *= 2; } // OLA
 495         for( Int_t z=0; z<zdim; z++ ){
 496             for( Int_t x=0; x<xdim; x++ ){
 497                 Float_t z2 = (z-par[k+2])*(z-par[k+2])/sigmaA2;
 498                 Float_t x2 = 0.;
 499                 Float_t signal = 0.;
 500                 if( electronics == 1 ){ // PASCAL
 501                     x2 = (x-par[k+1]+t2)/t2;
 502                     signal = (x2>0.) ? par[k]*x2*exp(-x2+1.-z2) :0.0; // RCCR2
 503                 //  signal =(x2>0.) ? par[k]*x2*x2*exp(-2*x2+2.-z2 ):0.0;//RCCR
 504                 }else if( electronics == 2 ) { // OLA
 505                     x2 = (x-par[k+1])*(x-par[k+1])/t2;
 506                     signal = par[k]  * exp( -x2 - z2 );
 507                 } else {
 508                   Warning("PeakFunc","Wrong SDD Electronics = %d",electronics);
 509                     // exit( 1 );
 510                 } // end if electronicx
 511                 spe[x*zdim+z] += signal;
 512                 if( integral != 0 ) integral[i] += signal;
 513             } // end for x
 514         } // end for z
 515         k += knParam;
 516     } // end for i
 517     return;
 518 }
 519 //__________________________________________________________________________
 520 Float_t AliITSClusterFinderSDD::ChiSqr( Int_t xdim, Int_t zdim, Float_t *spe,
 521                                         Float_t *speFit ) const{
 522     // EVALUATES UNNORMALIZED CHI-SQUARED
 523     Float_t chi2 = 0.;
 524     for( Int_t z=0; z<zdim; z++ ){
 525         for( Int_t x=1; x<xdim-1; x++ ){
 526             Int_t index = x*zdim+z;
 527             Float_t tmp = spe[index] - speFit[index];
 528             chi2 += tmp*tmp;
 529         } // end for x
 530     } // end for z
 531     return( chi2 );
 532 }
 533 //_______________________________________________________________________
 534 void AliITSClusterFinderSDD::Minim( Int_t xdim, Int_t zdim, Float_t *param,
 535                                     Float_t *prm0,Float_t *steprm,
 536                                     Float_t *chisqr,Float_t *spe,
 537                                     Float_t *speFit ){
 538     //
 539     Int_t   k, nnn, mmm, i;
 540     Float_t p1, delta, d1, chisq1, p2, chisq2, t, p3, chisq3, a, b, p0, chisqt;
 541     const Int_t knParam = 5;
 542     Int_t npeak = (Int_t)param[0];
 543     for( k=1; k<(npeak*knParam+1); k++ ) prm0[k] = param[k];
 544     for( k=1; k<(npeak*knParam+1); k++ ){
 545         p1 = param[k];
 546         delta = steprm[k];
 547         d1 = delta;
 548         // ENSURE THAT STEP SIZE IS SENSIBLY LARGER THAN MACHINE ROUND OFF
 549         if( fabs( p1 ) > 1.0E-6 )
 550             if ( fabs( delta/p1 ) < 1.0E-4 ) delta = p1/1000;
 551             else  delta = (Float_t)1.0E-4;
 552         //  EVALUATE CHI-SQUARED AT FIRST TWO SEARCH POINTS
 553         PeakFunc( xdim, zdim, param, speFit );
 554         chisq1 = ChiSqr( xdim, zdim, spe, speFit );
 555         p2 = p1+delta;
 556         param[k] = p2;
 557         PeakFunc( xdim, zdim, param, speFit );
 558         chisq2 = ChiSqr( xdim, zdim, spe, speFit );
 559         if( chisq1 < chisq2 ){
 560             // REVERSE DIRECTION OF SEARCH IF CHI-SQUARED IS INCREASING
 561             delta = -delta;
 562             t = p1;
 563             p1 = p2;
 564             p2 = t;
 565             t = chisq1;
 566             chisq1 = chisq2;
 567             chisq2 = t;
 568         } // end if
 569         i = 1; nnn = 0;
 570         do {   // INCREMENT param(K) UNTIL CHI-SQUARED STARTS TO INCREASE
 571             nnn++;
 572             p3 = p2 + delta;
 573             mmm = nnn - (nnn/5)*5;  // multiplo de 5
 574             if( mmm == 0 ){
 575                 d1 = delta;
 576                 // INCREASE STEP SIZE IF STEPPING TOWARDS MINIMUM IS TOO SLOW
 577                 delta *= 5;
 578             } // end if
 579             param[k] = p3;
 580             // Constrain paramiters
 581             Int_t kpos = (k-1) % knParam;
 582             switch( kpos ){
 583             case 0 :
 584                 if( param[k] <= 20 ) param[k] = fMinPeak;
 585                 break;
 586             case 1 :
 587                 if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 588                 break;
 589             case 2 :
 590                 if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 591                 break;
 592             case 3 :
 593                 if( param[k] < .5 ) param[k] = .5;
 594                 break;
 595             case 4 :
 596                 if( param[k] < .288 ) param[k] = .288;        // 1/sqrt(12) = 0.288
 597                 if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 598                 break;
 599             }; // end switch
 600             PeakFunc( xdim, zdim, param, speFit );
 601             chisq3 = ChiSqr( xdim, zdim, spe, speFit );
 602             if( chisq3 < chisq2 && nnn < 50 ){
 603                 p1 = p2;
 604                 p2 = p3;
 605                 chisq1 = chisq2;
 606                 chisq2 = chisq3;
 607             }else i=0;
 608         } while( i );
 609         // FIND MINIMUM OF PARABOLA DEFINED BY LAST THREE POINTS
 610         a = chisq1*(p2-p3)+chisq2*(p3-p1)+chisq3*(p1-p2);
 611         b = chisq1*(p2*p2-p3*p3)+chisq2*(p3*p3-p1*p1)+chisq3*(p1*p1-p2*p2);
 612         if( a!=0 ) p0 = (Float_t)(0.5*b/a);
 613         else p0 = 10000;
 614         //--IN CASE OF NEARLY EQUAL CHI-SQUARED AND TOO SMALL STEP SIZE PREVENT
 615         //   ERRONEOUS EVALUATION OF PARABOLA MINIMUM
 616         //---NEXT TWO LINES CAN BE OMITTED FOR HIGHER PRECISION MACHINES
 617         //dp = (Float_t) max (fabs(p3-p2), fabs(p2-p1));
 618         //if( fabs( p2-p0 ) > dp ) p0 = p2;
 619         param[k] = p0;
 620         // Constrain paramiters
 621         Int_t kpos = (k-1) % knParam;
 622         switch( kpos ){
 623         case 0 :
 624             if( param[k] <= 20 ) param[k] = fMinPeak;
 625             break;
 626         case 1 :
 627             if( fabs( param[k] - prm0[k] ) > 1.5 ) param[k] = prm0[k];
 628             break;
 629         case 2 :
 630             if( fabs( param[k] - prm0[k] ) > 1. ) param[k] = prm0[k];
 631             break;
 632         case 3 :
 633             if( param[k] < .5 ) param[k] = .5;
 634             break;
 635         case 4 :
 636             if( param[k] < .288 ) param[k] = .288;  // 1/sqrt(12) = 0.288
 637             if( param[k] > zdim*.5 ) param[k] = zdim*.5;
 638             break;
 639         }; // end switch
 640         PeakFunc( xdim, zdim, param, speFit );
 641         chisqt = ChiSqr( xdim, zdim, spe, speFit );
 642         // DO NOT ALLOW ERRONEOUS INTERPOLATION
 643         if( chisqt <= *chisqr ) *chisqr = chisqt;
 644         else param[k] = prm0[k];
 645         // OPTIMIZE SEARCH STEP FOR EVENTUAL NEXT CALL OF MINIM
 646         steprm[k] = (param[k]-prm0[k])/5;
 647         if( steprm[k] >= d1 ) steprm[k] = d1/5;
 648     } // end for k
 649     // EVALUATE FIT AND CHI-SQUARED FOR OPTIMIZED PARAMETERS
 650     PeakFunc( xdim, zdim, param, speFit );
 651     *chisqr = ChiSqr( xdim, zdim, spe, speFit );
 652     return;
 653 }
 654 //_________________________________________________________________________
 655 Int_t AliITSClusterFinderSDD::NoLinearFit( Int_t xdim, Int_t zdim,
 656                                            Float_t *param, Float_t *spe,
 657                                            Int_t *niter, Float_t *chir ){
 658     // fit method from Comput. Phys. Commun 46(1987) 149
 659     const Float_t kchilmt = 0.01;  //        relative accuracy
 660     const Int_t   knel = 3;        //        for parabolic minimization
 661     const Int_t   knstop = 50;     //        Max. iteration number
 662     const Int_t   knParam = 5;
 663     Int_t npeak = (Int_t)param[0];
 664     // RETURN IF NUMBER OF DEGREES OF FREEDOM IS NOT POSITIVE
 665     if( (xdim*zdim - npeak*knParam) <= 0 ) return( -1 );
 666     Float_t degFree = (xdim*zdim - npeak*knParam)-1;
 667     Int_t   n, k, iterNum = 0;
 668     Float_t *prm0 = new Float_t[npeak*knParam+1];
 669     Float_t *step = new Float_t[npeak*knParam+1];
 670     Float_t *schi = new Float_t[npeak*knParam+1];
 671     Float_t *sprm[3];
 672     sprm[0] = new Float_t[npeak*knParam+1];
 673     sprm[1] = new Float_t[npeak*knParam+1];
 674     sprm[2] = new Float_t[npeak*knParam+1];
 675     Float_t  chi0, chi1, reldif, a, b, prmin, dp;
 676     Float_t *speFit = new Float_t[ xdim*zdim ];
 677     PeakFunc( xdim, zdim, param, speFit );
 678     chi0 = ChiSqr( xdim, zdim, spe, speFit );
 679     chi1 = chi0;
 680     for( k=1; k<(npeak*knParam+1); k++) prm0[k] = param[k];
 681         for( k=1 ; k<(npeak*knParam+1); k+=knParam ){
 682             step[k] = param[k] / 20.0 ;
 683             step[k+1] = param[k+1] / 50.0;
 684             step[k+2] = param[k+2] / 50.0;
 685             step[k+3] = param[k+3] / 20.0;
 686             step[k+4] = param[k+4] / 20.0;
 687         } // end for k
 688     Int_t out = 0;
 689     do{
 690         iterNum++;
 691             chi0 = chi1;
 692             Minim( xdim, zdim, param, prm0, step, &chi1, spe, speFit );
 693             reldif = ( chi1 > 0 ) ? ((Float_t) fabs( chi1-chi0)/chi1 ) : 0;
 694         // EXIT conditions
 695         if( reldif < (float) kchilmt ){
 696             *chir  = (chi1>0) ? (float) TMath::Sqrt (chi1/degFree) :0;
 697             *niter = iterNum;
 698             out = 0;
 699             break;
 700         } // end if
 701         if( (reldif < (float)(5*kchilmt)) && (iterNum > knstop) ){
 702             *chir = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 703             *niter = iterNum;
 704             out = 0;
 705             break;
 706         } // end if
 707         if( iterNum > 5*knstop ){
 708             *chir  = (chi1>0) ?(float) TMath::Sqrt (chi1/degFree):0;
 709             *niter = iterNum;
 710             out = 1;
 711             break;
 712         } // end if
 713         if( iterNum <= knel ) continue;
 714         n = iterNum - (iterNum/knel)*knel; // EXTRAPOLATION LIMIT COUNTER N
 715         if( n > 3 || n == 0 ) continue;
 716         schi[n-1] = chi1;
 717         for( k=1; k<(npeak*knParam+1); k++ ) sprm[n-1][k] = param[k];
 718         if( n != 3 ) continue;
 719         // -EVALUATE EXTRAPOLATED VALUE OF EACH PARAMETER BY FINDING MINIMUM OF
 720         //    PARABOLA DEFINED BY LAST THREE CALLS OF MINIM
 721         for( k=1; k<(npeak*knParam+1); k++ ){
 722             Float_t tmp0 = sprm[0][k];
 723             Float_t tmp1 = sprm[1][k];
 724             Float_t tmp2 = sprm[2][k];
 725             a  = schi[0]*(tmp1-tmp2) + schi[1]*(tmp2-tmp0);
 726             a += (schi[2]*(tmp0-tmp1));
 727             b  = schi[0]*(tmp1*tmp1-tmp2*tmp2);
 728             b += (schi[1]*(tmp2*tmp2-tmp0*tmp0)+(schi[2]*
 729                                              (tmp0*tmp0-tmp1*tmp1)));
 730             if ((double)a < 1.0E-6) prmin = 0;
 731             else prmin = (float) (0.5*b/a);
 732             dp = 5*(tmp2-tmp0);
 733             if( fabs(prmin-tmp2) > fabs(dp) ) prmin = tmp2+dp;
 734             param[k] = prmin;
 735             step[k]  = dp/10; // OPTIMIZE SEARCH STEP
 736         } // end for k
 737     } while( kTRUE );
 738     delete [] prm0;
 739     delete [] step;
 740     delete [] schi;
 741     delete [] sprm[0];
 742     delete [] sprm[1];
 743     delete [] sprm[2];
 744     delete [] speFit;
 745     return( out );
 746 }
 747
 748 //______________________________________________________________________
 749 void AliITSClusterFinderSDD::ResolveClustersE(){
 750     // The function to resolve clusters if the clusters overlapping exists
 751     Int_t i;
 752     static AliITS *iTS = (AliITS*)gAlice->GetModule( "ITS" );
 753     // get number of clusters for this module
 754     Int_t nofClusters = fClusters->GetEntriesFast();
 755     nofClusters -= fNclusters;
 756     Int_t fNofMaps = fSegmentation->Npz();
 757     Int_t fNofAnodes = fNofMaps/2;
 758 //    Int_t fMaxNofSamples = fSegmentation->Npx();
 759     Int_t dummy=0;
 760     Double_t fTimeStep = fSegmentation->Dpx( dummy );
 761     Double_t fSddLength = fSegmentation->Dx();
 762     Double_t fDriftSpeed = fResponse->DriftSpeed();
 763     Double_t anodePitch = fSegmentation->Dpz( dummy );
 764     Float_t n, baseline;
 765     fResponse->GetNoiseParam( n, baseline );
 766     Int_t electronics = fResponse->Electronics(); // 1 = PASCAL, 2 = OLA
 767
 768     for( Int_t j=0; j<nofClusters; j++ ){
 769         // get cluster information
 770         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
 771         Int_t astart = clusterJ->Astart();
 772         Int_t astop = clusterJ->Astop();
 773         Int_t tstart = clusterJ->Tstartf();
 774         Int_t tstop = clusterJ->Tstopf();
 775         Int_t wing = (Int_t)clusterJ->W();
 776         if( wing == 2 ){
 777             astart += fNofAnodes;
 778             astop  += fNofAnodes;
 779         } // end if
 780         Int_t xdim = tstop-tstart+3;
 781         Int_t zdim = astop-astart+3;
 782         if( xdim > 50 || zdim > 30 ) {
 783             Warning("ResolveClustersE","xdim: %d , zdim: %d ",xdim,zdim);
 784             continue;
 785         }
 786         Float_t *sp = new Float_t[ xdim*zdim+1 ];
 787         memset( sp, 0, sizeof(Float_t)*(xdim*zdim+1) );
 788
 789         // make a local map from cluster region
 790         for( Int_t ianode=astart; ianode<=astop; ianode++ ){
 791             for( Int_t itime=tstart; itime<=tstop; itime++ ){
 792                 Float_t fadc = fMap->GetSignal( ianode, itime );
 793                 if( fadc > baseline ) fadc -= (Double_t)baseline;
 794                 else fadc = 0.;
 795                 Int_t index = (itime-tstart+1)*zdim+(ianode-astart+1);
 796                 sp[index] = fadc;
 797             } // time loop
 798         } // anode loop
 799
 800         // search peaks on cluster
 801         const Int_t kNp = 150;
 802         Int_t peakX1[kNp];
 803         Int_t peakZ1[kNp];
 804         Float_t peakAmp1[kNp];
 805         Int_t npeak = SearchPeak(sp,xdim,zdim,peakX1,peakZ1,peakAmp1,fMinPeak);
 806
 807         // if multiple peaks, split cluster
 808         if( npeak >= 1 )
 809         {
 810             //        cout << "npeak " << npeak << endl;
 811             //        clusterJ->PrintInfo();
 812             Float_t *par = new Float_t[npeak*5+1];
 813             par[0] = (Float_t)npeak;
 814             // Initial parameters in cell dimentions
 815             Int_t k1 = 1;
 816             for( i=0; i<npeak; i++ ){
 817                 par[k1] = peakAmp1[i];
 818                 par[k1+1] = peakX1[i]; // local time pos. [timebin]
 819                 par[k1+2] = peakZ1[i]; // local anode pos. [anodepitch]
 820                 if( electronics == 1 )
 821                     par[k1+3] = 2.; // PASCAL
 822                 else if( electronics == 2 )
 823                     par[k1+3] = 0.7; // tau [timebin]  OLA
 824                 par[k1+4] = .4;    // sigma        [anodepich]
 825                 k1+=5;
 826             } // end for i
 827             Int_t niter;
 828             Float_t chir;
 829             NoLinearFit( xdim, zdim, par, sp, &niter, &chir );
 830             Float_t peakX[kNp];
 831             Float_t peakZ[kNp];
 832             Float_t sigma[kNp];
 833             Float_t tau[kNp];
 834             Float_t peakAmp[kNp];
 835             Float_t integral[kNp];
 836             //get integrals => charge for each peak
 837             PeakFunc( xdim, zdim, par, sp, integral );
 838             k1 = 1;
 839             for( i=0; i<npeak; i++ ){
 840                 peakAmp[i] = par[k1];
 841                 peakX[i]   = par[k1+1];
 842                 peakZ[i]   = par[k1+2];
 843                 tau[i]     = par[k1+3];
 844                 sigma[i]   = par[k1+4];
 845                 k1+=5;
 846             } // end for i
 847             // calculate parameter for new clusters
 848             for( i=0; i<npeak; i++ ){
 849                 AliITSRawClusterSDD clusterI( *clusterJ );
 850
 851                 Int_t newAnode = peakZ1[i]-1 + astart;
 852
 853             //    Int_t newiTime = peakX1[i]-1 + tstart;
 854             //    Int_t shift = (Int_t)(fTimeCorr/fTimeStep + 0.5);
 855             //    if( newiTime > shift && newiTime < (fMaxNofSamples-shift) )
 856             //        shift = 0;
 857             //    Int_t peakpos = fMap->GetHitIndex( newAnode, newiTime+shift );
 858             //    clusterI.SetPeakPos( peakpos );
 859
 860                 clusterI.SetPeakAmpl( peakAmp1[i] );
 861                 Float_t newAnodef = peakZ[i] - 0.5 + astart;
 862                 Float_t newiTimef = peakX[i] - 1 + tstart;
 863                 if( wing == 2 ) newAnodef -= fNofAnodes;
 864                 Float_t anodePath = (newAnodef - fNofAnodes/2)*anodePitch;
 865                 newiTimef *= fTimeStep;
 866                 if( newiTimef > fTimeCorr ) newiTimef -= fTimeCorr;
 867                 if( electronics == 1 ){
 868                 //    newiTimef *= 0.999438;    // PASCAL
 869                 //    newiTimef += (6./fDriftSpeed - newiTimef/3000.);
 870                 }else if( electronics == 2 )
 871                     newiTimef *= 0.99714;    // OLA
 872
 873                 Int_t timeBin = (Int_t)(newiTimef/fTimeStep+0.5);
 874                 Int_t peakpos = fMap->GetHitIndex( newAnode, timeBin );
 875                 if( peakpos < 0 ) {
 876                     for( Int_t ii=0; ii<3; ii++ ) {
 877                         peakpos = fMap->GetHitIndex( newAnode, timeBin+ii );
 878                         if( peakpos > 0 ) break;
 879                         peakpos = fMap->GetHitIndex( newAnode, timeBin-ii );
 880                         if( peakpos > 0 ) break;
 881                     }
 882                 }
 883
 884                 if( peakpos < 0 ) {
 885              //      Warning( "ResolveClustersE", "Digit not found for cluster:\n" );
 886              //      clusterI.PrintInfo();
 887                    continue;
 888                 }
 889                 clusterI.SetPeakPos( peakpos );
 890                 Float_t driftPath = fSddLength - newiTimef * fDriftSpeed;
 891                 Float_t sign = ( wing == 1 ) ? -1. : 1.;
 892                 clusterI.SetX( driftPath*sign * 0.0001 );
 893                 clusterI.SetZ( anodePath * 0.0001 );
 894                 clusterI.SetAnode( newAnodef );
 895                 clusterI.SetTime( newiTimef );
 896                 clusterI.SetAsigma( sigma[i]*anodePitch );
 897                 clusterI.SetTsigma( tau[i]*fTimeStep );
 898                 clusterI.SetQ( integral[i] );
 899
 900                 iTS->AddCluster( 1, &clusterI );
 901             } // end for i
 902             fClusters->RemoveAt( j );
 903             delete [] par;
 904         } else {  // something odd
 905             Warning( "ResolveClustersE","--- Peak not found!!!!  minpeak=%d ,cluster peak= %f , module= %d",
 906                       fMinPeak, clusterJ->PeakAmpl(), fModule );
 907             clusterJ->PrintInfo();
 908             Warning( "ResolveClustersE"," xdim= %d zdim= %d", xdim-2, zdim-2 );
 909         }
 910         delete [] sp;
 911     } // cluster loop
 912     fClusters->Compress();
 913 //    fMap->ClearMap();
 914 }
 915
 916
 917 //________________________________________________________________________
 918 void  AliITSClusterFinderSDD::GroupClusters(){
 919     // group clusters
 920     Int_t dummy=0;
 921     Float_t fTimeStep = fSegmentation->Dpx(dummy);
 922     // get number of clusters for this module
 923     Int_t nofClusters = fClusters->GetEntriesFast();
 924     nofClusters -= fNclusters;
 925     AliITSRawClusterSDD *clusterI;
 926     AliITSRawClusterSDD *clusterJ;
 927     Int_t *label = new Int_t [nofClusters];
 928     Int_t i,j;
 929     for(i=0; i<nofClusters; i++) label[i] = 0;
 930     for(i=0; i<nofClusters; i++) {
 931         if(label[i] != 0) continue;
 932         for(j=i+1; j<nofClusters; j++) {
 933             if(label[j] != 0) continue;
 934             clusterI = (AliITSRawClusterSDD*) fClusters->At(i);
 935             clusterJ = (AliITSRawClusterSDD*) fClusters->At(j);
 936             // 1.3 good
 937             if(clusterI->T() < fTimeStep*60) fDAnode = 4.2;  // TB 3.2
 938             if(clusterI->T() < fTimeStep*10) fDAnode = 1.5;  // TB 1.
 939             Bool_t pair = clusterI->Brother(clusterJ,fDAnode,fDTime);
 940             if(!pair) continue;
 941             //      clusterI->PrintInfo();
 942             //      clusterJ->PrintInfo();
 943             clusterI->Add(clusterJ);
 944             label[j] = 1;
 945             fClusters->RemoveAt(j);
 946             j=i; // <- Ernesto
 947         } // J clusters
 948         label[i] = 1;
 949     } // I clusters
 950     fClusters->Compress();
 951
 952     delete [] label;
 953     return;
 954 }
 955 //________________________________________________________________________
 956 void AliITSClusterFinderSDD::SelectClusters(){
 957     // get number of clusters for this module
 958     Int_t nofClusters = fClusters->GetEntriesFast();
 959
 960     nofClusters -= fNclusters;
 961     Int_t i;
 962     for(i=0; i<nofClusters; i++) {
 963         AliITSRawClusterSDD *clusterI =(AliITSRawClusterSDD*) fClusters->At(i);
 964         Int_t rmflg = 0;
 965         Float_t wy = 0.;
 966         if(clusterI->Anodes() != 0.) {
 967             wy = ((Float_t) clusterI->Samples())/clusterI->Anodes();
 968         } // end if
 969         Int_t amp = (Int_t) clusterI->PeakAmpl();
 970         Int_t cha = (Int_t) clusterI->Q();
 971         if(amp < fMinPeak) rmflg = 1;
 972         if(cha < fMinCharge) rmflg = 1;
 973         if(wy < fMinNCells) rmflg = 1;
 974         //if(wy > fMaxNCells) rmflg = 1;
 975         if(rmflg) fClusters->RemoveAt(i);
 976     } // I clusters
 977     fClusters->Compress();
 978     return;
 979 }
 980 //__________________________________________________________________________
 981 void AliITSClusterFinderSDD::ResolveClusters(){
 982     // The function to resolve clusters if the clusters overlapping exists
 983 /*    AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
 984     // get number of clusters for this module
 985     Int_t nofClusters = fClusters->GetEntriesFast();
 986     nofClusters -= fNclusters;
 987     //cout<<"Resolve Cl: nofClusters, fNclusters ="<<nofClusters<<","
 988     // <<fNclusters<<endl;
 989     Int_t fNofMaps = fSegmentation->Npz();
 990     Int_t fNofAnodes = fNofMaps/2;
 991     Int_t dummy=0;
 992     Double_t fTimeStep = fSegmentation->Dpx(dummy);
 993     Double_t fSddLength = fSegmentation->Dx();
 994     Double_t fDriftSpeed = fResponse->DriftSpeed();
 995     Double_t anodePitch = fSegmentation->Dpz(dummy);
 996     Float_t n, baseline;
 997     fResponse->GetNoiseParam(n,baseline);
 998     Float_t dzz_1A = anodePitch * anodePitch / 12;
 999     // fill Map of signals
1000     fMap->FillMap();
1001     Int_t j,i,ii,ianode,anode,itime;
1002     Int_t wing,astart,astop,tstart,tstop,nanode;
1003     Double_t fadc,ClusterTime;
1004     Double_t q[400],x[400],z[400]; // digit charges and coordinates
1005     for(j=0; j<nofClusters; j++) {
1006         AliITSRawClusterSDD *clusterJ=(AliITSRawClusterSDD*) fClusters->At(j);
1007         Int_t ndigits = 0;
1008         astart=clusterJ->Astart();
1009         astop=clusterJ->Astop();
1010         tstart=clusterJ->Tstartf();
1011         tstop=clusterJ->Tstopf();
1012         nanode=clusterJ->Anodes();  // <- Ernesto
1013         wing=(Int_t)clusterJ->W();
1014         if(wing == 2) {
1015             astart += fNofAnodes;
1016             astop  += fNofAnodes;
1017         }  // end if
1018         // cout<<"astart,astop,tstart,tstop ="<<astart<<","<<astop<<","
1019         //      <<tstart<<","<<tstop<<endl;
1020         // clear the digit arrays
1021         for(ii=0; ii<400; ii++) {
1022             q[ii] = 0.;
1023             x[ii] = 0.;
1024             z[ii] = 0.;
1025         } // end for ii
1026
1027         for(ianode=astart; ianode<=astop; ianode++) {
1028             for(itime=tstart; itime<=tstop; itime++) {
1029                 fadc=fMap->GetSignal(ianode,itime);
1030                 if(fadc>baseline) {
1031                     fadc-=(Double_t)baseline;
1032                     q[ndigits] = fadc*(fTimeStep/160);  // KeV
1033                     anode = ianode;
1034                     if(wing == 2) anode -= fNofAnodes;
1035                     z[ndigits] = (anode + 0.5 - fNofAnodes/2)*anodePitch;
1036                     ClusterTime = itime*fTimeStep;
1037                     if(ClusterTime > fTimeCorr) ClusterTime -= fTimeCorr;// ns
1038                     x[ndigits] = fSddLength - ClusterTime*fDriftSpeed;
1039                     if(wing == 1) x[ndigits] *= (-1);
1040                     // cout<<"ianode,itime,fadc ="<<ianode<<","<<itime<<","
1041                     //     <<fadc<<endl;
1042                     // cout<<"wing,anode,ndigits,charge ="<<wing<<","
1043                     //      <<anode<<","<<ndigits<<","<<q[ndigits]<<endl;
1044                     ndigits++;
1045                     continue;
1046                 } //  end if
1047                 fadc=0;
1048                 //              cout<<"fadc=0, ndigits ="<<ndigits<<endl;
1049             } // time loop
1050         } // anode loop
1051         //     cout<<"for new cluster ndigits ="<<ndigits<<endl;
1052         // Fit cluster to resolve for two separate ones --------------------
1053         Double_t qq=0., xm=0., zm=0., xx=0., zz=0., xz=0.;
1054         Double_t dxx=0., dzz=0., dxz=0.;
1055         Double_t scl = 0., tmp, tga, elps = -1.;
1056         Double_t xfit[2], zfit[2], qfit[2];
1057         Double_t pitchz = anodePitch*1.e-4;             // cm
1058         Double_t pitchx = fTimeStep*fDriftSpeed*1.e-4;  // cm
1059         Double_t sigma2;
1060         Int_t nfhits;
1061         Int_t nbins = ndigits;
1062         Int_t separate = 0;
1063         // now, all lengths are in microns
1064         for (ii=0; ii<nbins; ii++) {
1065             qq += q[ii];
1066             xm += x[ii]*q[ii];
1067             zm += z[ii]*q[ii];
1068             xx += x[ii]*x[ii]*q[ii];
1069             zz += z[ii]*z[ii]*q[ii];
1070             xz += x[ii]*z[ii]*q[ii];
1071         } // end for ii
1072         xm /= qq;
1073         zm /= qq;
1074         xx /= qq;
1075         zz /= qq;
1076         xz /= qq;
1077         dxx = xx - xm*xm;
1078         dzz = zz - zm*zm;
1079         dxz = xz - xm*zm;
1080
1081         // shrink the cluster in the time direction proportionaly to the
1082         // dxx/dzz, which lineary depends from the drift path
1083         // new  Ernesto........
1084         if( nanode == 1 ){
1085             dzz = dzz_1A; // for one anode cluster dzz = anode**2/12
1086             scl = TMath::Sqrt( 7.2/(-0.57*xm*1.e-3+71.8) );
1087         } // end if
1088         if( nanode == 2 ){
1089             scl = TMath::Sqrt( (-0.18*xm*1.e-3+21.3)/(-0.57*xm*1.e-3+71.8) );
1090         } // end if
1091         if( nanode == 3 ){
1092             scl = TMath::Sqrt( (-0.5*xm*1.e-3+34.5)/(-0.57*xm*1.e-3+71.8) );
1093         } // end if
1094         if( nanode > 3 ){
1095             scl = TMath::Sqrt( (1.3*xm*1.e-3+49.)/(-0.57*xm*1.e-3+71.8) );
1096         } // end if
1097         //   cout<<"1 microns: zm,dzz,xm,dxx,dxz,qq ="<<zm<<","<<dzz<<","
1098         //  <<xm<<","<<dxx<<","<<dxz<<","<<qq<<endl;
1099         //  old Boris.........
1100         //  tmp=29730. - 585.*fabs(xm/1000.);
1101         //  scl=TMath::Sqrt(tmp/130000.);
1102
1103         xm *= scl;
1104         xx *= scl*scl;
1105         xz *= scl;
1106
1107         dxx = xx - xm*xm;
1108         //   dzz = zz - zm*zm;
1109         dxz = xz - xm*zm;
1110         //   cout<<"microns: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1111         // <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1112         // if(dzz < 7200.) dzz=7200.;//for one anode cluster dzz = anode**2/12
1113
1114         if (dxx < 0.) dxx=0.;
1115         // the data if no cluster overlapping (the coordunates are in cm)
1116         nfhits = 1;
1117         xfit[0] = xm*1.e-4;
1118         zfit[0] = zm*1.e-4;
1119         qfit[0] = qq;
1120         //   if(nbins < 7) cout<<"**** nbins ="<<nbins<<endl;
1121
1122         if (nbins >= 7) {
1123             if (dxz==0.) tga=0.;
1124             else {
1125                 tmp=0.5*(dzz-dxx)/dxz;
1126                 tga = (dxz<0.) ? tmp-TMath::Sqrt(tmp*tmp+1) :
1127                                                    tmp+TMath::Sqrt(tmp*tmp+1);
1128             } // end if dxz
1129             elps=(tga*tga*dxx-2*tga*dxz+dzz)/(dxx+2*tga*dxz+tga*tga*dzz);
1130             // change from microns to cm
1131             xm *= 1.e-4;
1132             zm *= 1.e-4;
1133             zz *= 1.e-8;
1134             xx *= 1.e-8;
1135             xz *= 1.e-8;
1136             dxz *= 1.e-8;
1137             dxx *= 1.e-8;
1138             dzz *= 1.e-8;
1139             //   cout<<"cm: zm,dzz,xm,dxx,xz,dxz,qq ="<<zm<<","<<dzz<<","
1140             //  <<xm<<","<<dxx<<","<<xz<<","<<dxz<<","<<qq<<endl;
1141             for (i=0; i<nbins; i++) {
1142                 x[i] = x[i] *= scl;
1143                 x[i] = x[i] *= 1.e-4;
1144                 z[i] = z[i] *= 1.e-4;
1145             } // end for i
1146             //     cout<<"!!! elps ="<<elps<<endl;
1147             if (elps < 0.3) { // try to separate hits
1148                 separate = 1;
1149                 tmp=atan(tga);
1150                 Double_t cosa=cos(tmp),sina=sin(tmp);
1151                 Double_t a1=0., x1=0., xxx=0.;
1152                 for (i=0; i<nbins; i++) {
1153                     tmp=x[i]*cosa + z[i]*sina;
1154                     if (q[i] > a1) {
1155                         a1=q[i];
1156                         x1=tmp;
1157                     } // end if
1158                     xxx += tmp*tmp*tmp*q[i];
1159                 } // end for i
1160                 xxx /= qq;
1161                 Double_t z12=-sina*xm + cosa*zm;
1162                 sigma2=(sina*sina*xx-2*cosa*sina*xz+cosa*cosa*zz) - z12*z12;
1163                 xm=cosa*xm + sina*zm;
1164                 xx=cosa*cosa*xx + 2*cosa*sina*xz + sina*sina*zz;
1165                 Double_t x2=(xx - xm*x1 - sigma2)/(xm - x1);
1166                 Double_t r=a1*2*TMath::ACos(-1.)*sigma2/(qq*pitchx*pitchz);
1167                 for (i=0; i<33; i++) { // solve a system of equations
1168                     Double_t x1_old=x1, x2_old=x2, r_old=r;
1169                     Double_t c11=x1-x2;
1170                     Double_t c12=r;
1171                     Double_t c13=1-r;
1172                     Double_t c21=x1*x1 - x2*x2;
1173                     Double_t c22=2*r*x1;
1174                     Double_t c23=2*(1-r)*x2;
1175                     Double_t c31=3*sigma2*(x1-x2) + x1*x1*x1 - x2*x2*x2;
1176                     Double_t c32=3*r*(sigma2 + x1*x1);
1177                     Double_t c33=3*(1-r)*(sigma2 + x2*x2);
1178                     Double_t f1=-(r*x1 + (1-r)*x2 - xm);
1179                     Double_t f2=-(r*(sigma2+x1*x1)+(1-r)*(sigma2+x2*x2)- xx);
1180                     Double_t f3=-(r*x1*(3*sigma2+x1*x1)+(1-r)*x2*
1181                                                          (3*sigma2+x2*x2)-xxx);
1182                     Double_t d=c11*c22*c33+c21*c32*c13+c12*c23*c31-
1183                                        c31*c22*c13 - c21*c12*c33 - c32*c23*c11;
1184                     if (d==0.) {
1185                         cout<<"*********** d=0 ***********\n";
1186                         break;
1187                     } // end if
1188                     Double_t dr=f1*c22*c33 + f2*c32*c13 + c12*c23*f3 -
1189                         f3*c22*c13 - f2*c12*c33 - c32*c23*f1;
1190                     Double_t d1=c11*f2*c33 + c21*f3*c13 + f1*c23*c31 -
1191                         c31*f2*c13 - c21*f1*c33 - f3*c23*c11;
1192                     Double_t d2=c11*c22*f3 + c21*c32*f1 + c12*f2*c31 -
1193                         c31*c22*f1 - c21*c12*f3 - c32*f2*c11;
1194                     r  += dr/d;
1195                     x1 += d1/d;
1196                     x2 += d2/d;
1197                     if (fabs(x1-x1_old) > 0.0001) continue;
1198                     if (fabs(x2-x2_old) > 0.0001) continue;
1199                     if (fabs(r-r_old)/5 > 0.001) continue;
1200                     a1=r*qq*pitchx*pitchz/(2*TMath::ACos(-1.)*sigma2);
1201                     Double_t a2=a1*(1-r)/r;
1202                     qfit[0]=a1; xfit[0]=x1*cosa - z12*sina; zfit[0]=x1*sina +
1203                                                                 z12*cosa;
1204                     qfit[1]=a2; xfit[1]=x2*cosa - z12*sina; zfit[1]=x2*sina +
1205                                                                 z12*cosa;
1206                     nfhits=2;
1207                     break; // Ok !
1208                 } // end for i
1209                 if (i==33) cerr<<"No more iterations ! "<<endl;
1210             } // end of attempt to separate overlapped clusters
1211         } // end of nbins cut
1212         if(elps < 0.) cout<<" elps=-1 ="<<elps<<endl;
1213         if(elps >0. && elps< 0.3 && nfhits == 1) cout<<" small elps, nfh=1 ="
1214                                                      <<elps<<","<<nfhits<<endl;
1215         if(nfhits == 2) cout<<" nfhits=2 ="<<nfhits<<endl;
1216         for (i=0; i<nfhits; i++) {
1217             xfit[i] *= (1.e+4/scl);
1218             if(wing == 1) xfit[i] *= (-1);
1219             zfit[i] *= 1.e+4;
1220             //       cout<<" ---------  i,xfiti,zfiti,qfiti ="<<i<<","
1221             // <<xfit[i]<<","<<zfit[i]<<","<<qfit[i]<<endl;
1222         } // end for i
1223         Int_t ncl = nfhits;
1224         if(nfhits == 1 && separate == 1) {
1225             cout<<"!!!!! no separate"<<endl;
1226             ncl = -2;
1227         }  // end if
1228         if(nfhits == 2) {
1229             cout << "Split cluster: " << endl;
1230             clusterJ->PrintInfo();
1231             cout << " in: " << endl;
1232             for (i=0; i<nfhits; i++) {
1233                 // AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,
1234                                                -1,-1,(Float_t)qfit[i],ncl,0,0,
1235                                                (Float_t)xfit[i],
1236                                                (Float_t)zfit[i],0,0,0,0,
1237                                                 tstart,tstop,astart,astop);
1238             //        AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,-1,
1239             //                                 -1,(Float_t)qfit[i],0,0,0,
1240             //                                  (Float_t)xfit[i],
1241             //                                  (Float_t)zfit[i],0,0,0,0,
1242             //                                  tstart,tstop,astart,astop,ncl);
1243             // ???????????
1244             // if(wing == 1) xfit[i] *= (-1);
1245             Float_t Anode = (zfit[i]/anodePitch+fNofAnodes/2-0.5);
1246             Float_t Time = (fSddLength - xfit[i])/fDriftSpeed;
1247             Float_t clusterPeakAmplitude = clusterJ->PeakAmpl();
1248             Float_t peakpos = clusterJ->PeakPos();
1249             Float_t clusteranodePath = (Anode - fNofAnodes/2)*anodePitch;
1250             Float_t clusterDriftPath = Time*fDriftSpeed;
1251             clusterDriftPath = fSddLength-clusterDriftPath;
1252             AliITSRawClusterSDD *clust = new AliITSRawClusterSDD(wing,Anode,
1253                                                                  Time,qfit[i],
1254                                                clusterPeakAmplitude,peakpos,
1255                                                0.,0.,clusterDriftPath,
1256                                          clusteranodePath,clusterJ->Samples()/2
1257                                     ,tstart,tstop,0,0,0,astart,astop);
1258             clust->PrintInfo();
1259             iTS->AddCluster(1,clust);
1260             //        cout<<"new cluster added: tstart,tstop,astart,astop,x,ncl ="
1261             // <<tstart<<","<<tstop<<","<<astart<<","<<astop<<","<<xfit[i]
1262             // <<","<<ncl<<endl;
1263             delete clust;
1264         }// nfhits loop
1265         fClusters->RemoveAt(j);
1266     } // if nfhits = 2
1267 } // cluster loop
1268 fClusters->Compress();
1269 fMap->ClearMap();
1270 */
1271     return;
1272 }
1273 //______________________________________________________________________
1274 void AliITSClusterFinderSDD::GetRecPoints(){
1275     // get rec points
1276     static AliITS *iTS=(AliITS*)gAlice->GetModule("ITS");
1277     // get number of clusters for this module
1278     Int_t nofClusters = fClusters->GetEntriesFast();
1279     nofClusters -= fNclusters;
1280     const Float_t kconvGeV = 1.e-6; // GeV -> KeV
1281     const Float_t kconv = 1.0e-4;
1282     const Float_t kRMSx = 38.0*kconv; // microns->cm ITS TDR Table 1.3
1283     const Float_t kRMSz = 28.0*kconv; // microns->cm ITS TDR Table 1.3
1284     Int_t i;
1285     Int_t ix, iz, idx=-1;
1286     AliITSdigitSDD *dig=0;
1287     Int_t ndigits=fDigits->GetEntriesFast();
1288     for(i=0; i<nofClusters; i++) {
1289         AliITSRawClusterSDD *clusterI = (AliITSRawClusterSDD*)fClusters->At(i);
1290         if(!clusterI) Error("SDD: GetRecPoints","i clusterI ",i,clusterI);
1291         if(clusterI) idx=clusterI->PeakPos();
1292         if(idx>ndigits) Error("SDD: GetRecPoints","idx ndigits",idx,ndigits);
1293         // try peak neighbours - to be done
1294         if(idx&&idx<= ndigits) dig =(AliITSdigitSDD*)fDigits->UncheckedAt(idx);
1295         if(!dig) {
1296             // try cog
1297             fSegmentation->GetPadIxz(clusterI->X(),clusterI->Z(),ix,iz);
1298             dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix-1);
1299             // if null try neighbours
1300             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix);
1301             if (!dig) dig = (AliITSdigitSDD*)fMap->GetHit(iz-1,ix+1);
1302             if (!dig) printf("SDD: cannot assign the track number!\n");
1303         } //  end if !dig
1304         AliITSRecPoint rnew;
1305         rnew.SetX(clusterI->X());
1306         rnew.SetZ(clusterI->Z());
1307         rnew.SetQ(clusterI->Q());   // in KeV - should be ADC
1308         rnew.SetdEdX(kconvGeV*clusterI->Q());
1309         rnew.SetSigmaX2(kRMSx*kRMSx);
1310         rnew.SetSigmaZ2(kRMSz*kRMSz);
1311
1312         if(dig) rnew.fTracks[0]=dig->GetTrack(0);
1313         if(dig) rnew.fTracks[1]=dig->GetTrack(1);
1314         if(dig) rnew.fTracks[2]=dig->GetTrack(2);
1315
1316         iTS->AddRecPoint(rnew);
1317     } // I clusters
1318 //    fMap->ClearMap();
1319 }
1320 //______________________________________________________________________
1321 void AliITSClusterFinderSDD::FindRawClusters(Int_t mod){
1322     // find raw clusters
1323
1324     fModule = mod;
1325
1326     Find1DClustersE();
1327     GroupClusters();
1328     SelectClusters();
1329     ResolveClustersE();
1330     GetRecPoints();
1331 }
1332 //_______________________________________________________________________
1333 void AliITSClusterFinderSDD::Print() const{
1334     // Print SDD cluster finder Parameters
1335
1336     cout << "**************************************************" << endl;
1337     cout << " Silicon Drift Detector Cluster Finder Parameters " << endl;
1338     cout << "**************************************************" << endl;
1339     cout << "Number of Clusters: " << fNclusters << endl;
1340     cout << "Anode Tolerance: " << fDAnode << endl;
1341     cout << "Time  Tolerance: " << fDTime << endl;
1342     cout << "Time  correction (electronics): " << fTimeCorr << endl;
1343     cout << "Cut Amplitude (threshold): " << fCutAmplitude << endl;
1344     cout << "Minimum Amplitude: " << fMinPeak << endl;
1345     cout << "Minimum Charge: " << fMinCharge << endl;
1346     cout << "Minimum number of cells/clusters: " << fMinNCells << endl;
1347     cout << "Maximum number of cells/clusters: " << fMaxNCells << endl;
1348     cout << "**************************************************" << endl;
1349 }