/usr/include/root/Math/GSLRootFinderDeriv.h is in libroot-math-mathmore-dev 5.34.14-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Authors: L. Moneta, A. Zsenei 08/2005
/**********************************************************************
* *
* Copyright (c) 2004 ROOT Foundation, CERN/PH-SFT *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this library (see file COPYING); if not, write *
* to the Free Software Foundation, Inc., 59 Temple Place, Suite *
* 330, Boston, MA 02111-1307 USA, or contact the author. *
* *
**********************************************************************/
// Header file for class GSLRootFinderDeriv
//
// Created by: moneta at Sun Nov 21 16:26:03 2004
//
// Last update: Sun Nov 21 16:26:03 2004
//
#ifndef ROOT_Math_GSL_RootFinderDeriv
#define ROOT_Math_GSL_RootFinderDeriv
#ifndef ROOT_Math_GSLFunctionAdapter
#include "Math/GSLFunctionAdapter.h"
#endif
#ifndef ROOT_Math_IFunctionfwd
#include "Math/IFunctionfwd.h"
#endif
#ifndef ROOT_Math_IFunction
#include "Math/IFunction.h"
#endif
#ifndef ROOT_Math_IRootFinderMethod
#include "Math/IRootFinderMethod.h"
#endif
#include <iostream>
namespace ROOT {
namespace Math {
class GSLRootFdFSolver;
class GSLFunctionDerivWrapper;
//_____________________________________________________________________________________
/**
Base class for GSL Root-Finding algorithms for one dimensional functions which use function derivatives.
For finding the roots users should not use this class directly but instantiate the derived classes,
for example ROOT::Math::Roots::Newton for using the Newton algorithm.
All the classes defining the alhorithms are defined in the header Math/RootFinderAlgorithm.h
They possible types implementing root bracketing algorithms which use function
derivatives are:
<ul>
<li>ROOT::Math::Roots::Newton
<li>ROOT::Math::Roots::Secant
<li>ROOT::Math::Roots::Steffenson
</ul>
See also those classes for the documentation.
See the GSL <A HREF="http://www.gnu.org/software/gsl/manual/html_node/Root-Finding-Algorithms-using-Derivatives.html"> online manual</A> for
information on the GSL Root-Finding algorithms
@ingroup RootFinders
*/
class GSLRootFinderDeriv: public IRootFinderMethod {
public:
GSLRootFinderDeriv();
virtual ~GSLRootFinderDeriv();
private:
// usually copying is non trivial, so we make this unaccessible
GSLRootFinderDeriv(const GSLRootFinderDeriv &);
GSLRootFinderDeriv & operator = (const GSLRootFinderDeriv &);
public:
#if defined(__MAKECINT__) || defined(G__DICTIONARY)
bool SetFunction( const IGenFunction & , double , double ) {
std::cerr <<"GSLRootFinderDeriv - Error : Algorithm requirs derivatives" << std::endl;
return false;
}
#endif
bool SetFunction( const IGradFunction & f, double xstart) {
const void * p = &f;
return SetFunction( &GSLFunctionAdapter<IGradFunction>::F, &GSLFunctionAdapter<IGradFunction>::Df, &GSLFunctionAdapter<IGradFunction>::Fdf, const_cast<void *>(p), xstart );
}
typedef double ( * GSLFuncPointer ) ( double, void *);
typedef void ( * GSLFdFPointer ) ( double, void *, double *, double *);
bool SetFunction( GSLFuncPointer f, GSLFuncPointer df, GSLFdFPointer fdf, void * p, double Root );
using IRootFinderMethod::SetFunction;
/// iterate (return GSL_SUCCESS in case of successful iteration)
int Iterate();
double Root() const;
/// Find the root (return false if failed)
bool Solve( int maxIter = 100, double absTol = 1E-8, double relTol = 1E-10);
/// Return number of iterations
int Iterations() const {
return fIter;
}
/// Return the status of last root finding
int Status() const { return fStatus; }
const char * Name() const;
protected:
void SetSolver ( GSLRootFdFSolver * s );
void FreeSolver();
private:
GSLFunctionDerivWrapper * fFunction;
GSLRootFdFSolver * fS;
mutable double fRoot;
mutable double fPrevRoot;
int fIter;
int fStatus;
bool fValidPoint;
};
} // namespace Math
} // namespace ROOT
#endif /* ROOT_Math_GSL_RootFinderDeriv */
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