1 /**************************************************************************
2 * This file is property of and copyright by *
3 * the Relativistic Heavy Ion Group (RHIG), Yale University, US, 2009 *
5 * Primary Author: Per Thomas Hille <p.t.hille@fys.uio.no> *
7 * Contributors are mentioned in the code where appropriate. *
8 * Please report bugs to p.t.hille@fys.uio.no *
10 * Permission to use, copy, modify and distribute this software and its *
11 * documentation strictly for non-commercial purposes is hereby granted *
12 * without fee, provided that the above copyright notice appears in all *
13 * copies and that both the copyright notice and this permission notice *
14 * appear in the supporting documentation. The authors make no claims *
15 * about the suitability of this software for any purpose. It is *
16 * provided "as is" without express or implied warranty. *
17 **************************************************************************/
20 // Extraction of amplitude and peak position
21 // FRom CALO raw data using
22 // least square fit for the
23 // Moment assuming identical and
24 // independent errors (equivalent with chi square)
27 #include "AliCaloRawAnalyzerLMS.h"
28 #include "AliCaloBunchInfo.h"
29 #include "AliCaloFitResults.h"
39 ClassImp( AliCaloRawAnalyzerLMS )
41 AliCaloRawAnalyzerLMS::AliCaloRawAnalyzerLMS() : AliCaloRawAnalyzerFitter("Chi Square Fit", "LMS")
47 AliCaloRawAnalyzerLMS::~AliCaloRawAnalyzerLMS()
54 AliCaloRawAnalyzerLMS::Evaluate( const vector<AliCaloBunchInfo> &bunchvector, const UInt_t altrocfg1, const UInt_t altrocfg2 )
56 // Extracting signal parameters using fitting
57 short maxampindex; //index of maximum amplitude
58 short maxamp; //Maximum amplitude
59 int index = SelectBunch( bunchvector, &maxampindex, &maxamp );
63 Float_t ped = ReverseAndSubtractPed( &(bunchvector.at(index)) , altrocfg1, altrocfg2, fReversed );
64 Float_t maxf = TMath::MaxElement( bunchvector.at(index).GetLength(), fReversed );
65 short maxrev = maxampindex - bunchvector.at(index).GetStartBin();
66 // timebinOffset is timebin value at maximum (maxrev)
67 short timebinOffset = maxampindex - (bunchvector.at(index).GetLength()-1);
68 if( maxf < fAmpCut || ( maxamp - ped) > fOverflowCut ) // (maxamp - ped) > fOverflowCut = Close to saturation (use low gain then)
70 return AliCaloFitResults( maxamp, ped, Ret::kCrude, maxf, timebinOffset);
72 else if ( maxf >= fAmpCut )
76 SelectSubarray( fReversed, bunchvector.at(index).GetLength(), maxrev, &first, &last, fFitArrayCut);
77 int nsamples = last - first + 1;
79 if( ( nsamples ) >= fNsampleCut )
81 Float_t tmax = (maxrev - first); // local tmax estimate
82 TGraph *graph = new TGraph( nsamples, fXaxis, &fReversed[first] );
83 fTf1->SetParameter(0, maxf*fkEulerSquared );
84 fTf1->SetParameter(1, tmax - fTau);
85 // set rather loose parameter limits
86 fTf1->SetParLimits(0, 0.5*maxf*fkEulerSquared, 2*maxf*fkEulerSquared );
87 fTf1->SetParLimits(1, tmax - fTau - 4, tmax - fTau + 4);
90 fTf1->FixParameter(2, fTau);
93 fTf1->ReleaseParameter(2); // allow par. to vary
94 fTf1->SetParameter(2, fTau);
97 Short_t tmpStatus = 0;
99 tmpStatus = graph->Fit(fTf1, "Q0RW");
101 catch (const std::exception & e) {
102 AliError( Form("TGraph Fit exception %s", e.what()) );
103 return AliCaloFitResults( maxamp, ped, Ret::kNoFit, maxf, timebinOffset,
104 timebinOffset, Ret::kDummy, Ret::kDummy, Ret::kDummy, AliCaloFitSubarray(index, maxrev, first, last) );
107 if( fVerbose == true )
109 AliCaloRawAnalyzer::PrintBunch( bunchvector.at(index) );
110 PrintFitResult( fTf1 ) ;
113 tmax = fTf1->GetParameter(1) + timebinOffset - (maxrev - first) // abs. t0
114 + fTf1->GetParameter(2); // +tau, makes sum tmax
117 return AliCaloFitResults( maxamp, ped , Ret::kFitPar,
118 fTf1->GetParameter(0)/fkEulerSquared,
121 fTf1->GetChisquare(),
123 Ret::kDummy, AliCaloFitSubarray(index, maxrev, first, last) );
130 Float_t chi2 = CalculateChi2(maxf, maxrev, first, last);
131 Int_t ndf = last - first - 1; // nsamples - 2
132 return AliCaloFitResults( maxamp, ped, Ret::kCrude, maxf, timebinOffset,
133 timebinOffset, chi2, ndf, Ret::kDummy, AliCaloFitSubarray(index, maxrev, first, last) );
137 return AliCaloFitResults( Ret::kInvalid, Ret::kInvalid );