Started to make general unfolding class (only header up to now)

diff --git a/PWG0/AliUnfolding.h b/PWG0/AliUnfolding.h
new file mode 100644 (file)
index 0000000..f07e27b
--- /dev/null
+++ b/PWG0/AliUnfolding.h
@@ -0,0 +1,106 @@
+/* $Id$ */
+
+#ifndef ALIUNFOLDING_H
+#define ALIUNFOLDING_H
+
+//
+// class that implements several unfolding methods
+// E.g. chi2 minimization and bayesian unfolding
+//
+
+// TMatrixD, TVectorD defined here, because it does not seem possible to predeclare these (or i do not know how)
+// -->
+// $ROOTSYS/include/TVectorDfwd.h:21: conflicting types for `typedef struct TVectorT<Double_t> TVectorD'
+// PWG0/AliUnfolding.h:21: previous declaration as `struct TVectorD'
+
+#include "TObject.h"
+#include <TMatrixD.h>
+#include <TVectorD.h>
+
+class TH1;
+class TH2;
+class TH1F;
+class TH2F;
+class TH3F;
+class TF1;
+class TCollection;
+
+class AliUnfolding : public TObject
+{
+  public:
+    enum RegularizationType { kNone = 0, kPol0, kPol1, kLog, kEntropy, kCurvature };
+    enum MethodType { kChi2Minimization = 0, kBayesian = 1 };
+
+    AliUnfolding();
+    virtual ~AliUnfolding();
+
+    void SetInput(TH2* correlationMatrix, TH1* efficiency, TH1* measured) { fCurrentCorrelation = correlationMatrix; fCurrentEfficiency = efficiency; fCurrentESD = measured; }
+    void SetInitialConditions(TH1* initialConditions) { fInitialConditions = initialConditions; }
+    const TH1* GetResult() const { return fResult; }
+
+    static void SetParameters(Int_t measuredBins, Int_t unfoldedBins, Bool_t bigbin) { fMaxInput = measuredBins; fMaxParams = unfoldedBins; fgCreateBigBin = bigbin; }
+    static void SetChi2MinimizationParameters(RegularizationType type, Float_t weight) { fgRegularizationType = type; fgRegularizationWeight = weight; }
+    static void SetRegularizationRange(Int_t start, Int_t end) { fgRegularizationRangeStart = start; fgRegularizationRangeEnd = end; }
+    static void SetBayesianParameters(Float_t smoothing, Int_t nIterations) { fgBayesianSmoothing = smoothing; fgBayesianIterations = nIterations; }
+
+    Int_t ApplyMinuitFit(Bool_t check = kFALSE);
+    Int_t ApplyBayesianMethod(Bool_t determineError = kTRUE);
+    Int_t ApplyNBDFit();
+    Int_t ApplyLaszloMethod();
+
+    TH1* StatisticalUncertainty(MethodType methodType, Bool_t randomizeMeasured, Bool_t randomizeResponse, TH1* compareTo = 0);
+
+  protected:
+    static Double_t RegularizationPol0(TVectorD& params);
+    static Double_t RegularizationPol1(TVectorD& params);
+    static Double_t RegularizationTotalCurvature(TVectorD& params);
+    static Double_t RegularizationEntropy(TVectorD& params);
+    static Double_t RegularizationLog(TVectorD& params);
+
+    static void MinuitFitFunction(Int_t&, Double_t*, Double_t& chi2, Double_t *params, Int_t);
+    static void MinuitNBD(Int_t& unused1, Double_t* unused2, Double_t& chi2, Double_t *params, Int_t unused3);
+
+    void SetupCurrentHists();
+
+    Int_t UnfoldWithBayesian(* aEfficiency, TH1* measured, TH1* initialConditions, TH1* aResult, Float_t regPar, Int_t nIterations);
+    Int_t UnfoldWithMinuit(TH1* correlation, TH1* aEfficiency, TH1* measured, TH1* initialConditions, TH1* result, Bool_t check);
+
+    Float_t BayesCovarianceDerivate(Float_t matrixM[251][251], TH2* hResponse, Int_t k, Int_t i, Int_t r, Int_t u);
+
+    TH1* fCurrentESD;         //! measured spectrum
+    TH2* fCurrentCorrelation; //! correlation matrix
+    TH1* fCurrentEfficiency;  //! efficiency
+    TH1* fInitialConditions;  //! initial conditions
+    TH1* fResult;             //! unfolding result
+
+    // static variable to be accessed by MINUIT
+    static TMatrixD* fgCorrelationMatrix;            //! contains fCurrentCorrelation in matrix form
+    static TMatrixD* fgCorrelationCovarianceMatrix;  //! contains the errors of fCurrentESD
+    static TVectorD* fgCurrentESDVector;             //! contains fCurrentESD
+    static TVectorD* fgEntropyAPriori;               //! a-priori distribution for entropy regularization
+
+    static TF1* fgNBD;   //! negative binomial distribution
+
+    static Int_t fgMaxParams;  //! bins in unfolded histogram = number of fit params
+    static Int_t fgMaxInput;   //! bins in measured histogram
+
+    // configuration params follow
+    static RegularizationType fgRegularizationType; //! regularization that is used during Chi2 method
+    static Float_t fgRegularizationWeight;          //! factor for regularization term
+    static Int_t fgRegularizationRangeStart;        //! first bin where regularization is applied
+    static Int_t fgRegularizationRangeEnd;          //! last bin + 1 where regularization is applied
+    static Bool_t  fgCreateBigBin;                  //! to fix fluctuations at high multiplicities, all entries above a certain limit are summarized in one bin
+
+    static Float_t fgBayesianSmoothing;             //! smoothing parameter (0 = no smoothing)
+    static Int_t   fgBayesianIterations;            //! number of iterations in Bayesian method
+    // end of configuration
+
+ private:
+    AliUnfolding(const AliUnfolding&);
+    AliUnfolding& operator=(const AliUnfolding&);
+
+  ClassDef(AliUnfolding, 0);
+};
+
+#endif
+