root/Minuit2/MinimumParameters.h

0001 // @(#)root/minuit2:$Id$
0002 // Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005
0003
0004 /**********************************************************************
0005  *                                                                    *
0006  * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
0007  *                                                                    *
0008  **********************************************************************/
0009
0010 #ifndef ROOT_Minuit2_MinimumParameters
0011 #define ROOT_Minuit2_MinimumParameters
0012
0013 #include "Minuit2/MnMatrix.h"
0014
0015 namespace ROOT {
0016
0017 namespace Minuit2 {
0018
0019 class MinimumParameters {
0020
0021 public:
0022    MinimumParameters(unsigned int n, double fval = 0)
0023       : fPtr{new Data{MnAlgebraicVector(n), MnAlgebraicVector(n), fval, false, false}}
0024    {
0025    }
0026
0027    /** takes the Parameter vector */
0028    MinimumParameters(const MnAlgebraicVector &avec, double fval)
0029       : fPtr{new Data{avec, MnAlgebraicVector(avec.size()), fval, true, false}}
0030    {
0031    }
0032
0033    /** takes the Parameter vector plus step size x1 - x0 = dirin */
0034    MinimumParameters(const MnAlgebraicVector &avec, const MnAlgebraicVector &dirin, double fval)
0035       : fPtr{new Data{avec, dirin, fval, true, true}}
0036    {
0037    }
0038
0039    const MnAlgebraicVector &Vec() const { return fPtr->fParameters; }
0040    const MnAlgebraicVector &Dirin() const { return fPtr->fStepSize; }
0041    double Fval() const { return fPtr->fFVal; }
0042    bool IsValid() const { return fPtr->fValid; }
0043    bool HasStepSize() const { return fPtr->fHasStep; }
0044
0045 private:
0046    struct Data {
0047       MnAlgebraicVector fParameters;
0048       MnAlgebraicVector fStepSize;
0049       double fFVal;
0050       bool fValid;
0051       bool fHasStep;
0052    };
0053
0054    std::shared_ptr<Data> fPtr;
0055 };
0056
0057 } // namespace Minuit2
0058
0059 } // namespace ROOT
0060
0061 #endif // ROOT_Minuit2_MinimumParameters