/usr/include/root/TMVA/RootFinder.h is in libroot-tmva-dev 5.34.30-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Andreas Hoecker, Joerg Stelzer, Helge Voss, Kai Voss
/**********************************************************************************
* Project: TMVA - a Root-integrated toolkit for multivariate data analysis *
* Package: TMVA *
* Class : RootFinder *
* Web : http://tmva.sourceforge.net *
* *
* Description: *
* Root finding using Brents algorithm *
* (translated from CERNLIB function RZERO) *
* *
* Authors (alphabetical): *
* Andreas Hoecker <Andreas.Hocker@cern.ch> - CERN, Switzerland *
* Helge Voss <Helge.Voss@cern.ch> - MPI-K Heidelberg, Germany *
* Kai Voss <Kai.Voss@cern.ch> - U. of Victoria, Canada *
* *
* Copyright (c) 2005: *
* CERN, Switzerland *
* U. of Victoria, Canada *
* MPI-K Heidelberg, Germany *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted according to the terms listed in LICENSE *
* (http://tmva.sourceforge.net/LICENSE) *
**********************************************************************************/
#ifndef ROOT_TMVA_RootFinder
#define ROOT_TMVA_RootFinder
//////////////////////////////////////////////////////////////////////////
// //
// RootFinder //
// //
// Root finding using Brents algorithm //
// (translated from CERNLIB function RZERO) //
// //
//////////////////////////////////////////////////////////////////////////
#ifndef ROOT_TObject
#include "TObject.h"
#endif
namespace TMVA {
class MsgLogger;
class RootFinder : public TObject {
public:
RootFinder( Double_t (*rootVal)( Double_t ),
Double_t rootMin, Double_t rootMax,
Int_t maxIterations = 100,
Double_t absTolerance = 0.0 );
virtual ~RootFinder( void );
// returns the root of the function
Double_t Root( Double_t refValue );
private:
Double_t fRootMin; // minimum root value
Double_t fRootMax; // maximum root value
Int_t fMaxIter; // maximum number of iterations
Double_t fAbsTol; // absolute tolerance deviation
// function pointer
Double_t (*fGetRootVal)( Double_t );
mutable MsgLogger* fLogger; //! message logger
MsgLogger& Log() const { return *fLogger; }
ClassDef(RootFinder,0) // Root finding using Brents algorithm
};
} // namespace TMVA
#endif
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