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NegativeG2LineSearch.h
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1 // @(#)root/minuit2:$Id$
2 // Authors: M. Winkler, F. James, L. Moneta, A. Zsenei 2003-2005
3 
4 /**********************************************************************
5  * *
6  * Copyright (c) 2005 LCG ROOT Math team, CERN/PH-SFT *
7  * *
8  **********************************************************************/
9 
10 #ifndef ROOT_Minuit2_NegativeG2LineSearch
11 #define ROOT_Minuit2_NegativeG2LineSearch
12 
13 namespace ROOT {
14 
15  namespace Minuit2 {
16 
17 
18 class MnFcn;
19 class MinimumState;
20 class GradientCalculator;
21 class MnMachinePrecision;
22 class FunctionGradient;
23 
24 /** In case that one of the components of the second derivative g2 calculated
25  by the numerical Gradient calculator is negative, a 1dim line search in
26  the direction of that component is done in order to find a better position
27  where g2 is again positive.
28  */
29 
31 
32 public:
33 
35 
37 
38  MinimumState operator()(const MnFcn&, const MinimumState&, const GradientCalculator&, const MnMachinePrecision&) const;
39 
40  bool HasNegativeG2(const FunctionGradient&, const MnMachinePrecision&) const;
41 
42 private:
43 
44 };
45 
46  } // namespace Minuit2
47 
48 } // namespace ROOT
49 
50 #endif // ROOT_Minuit2_NegativeG2LineSearch
determines the relative floating point arithmetic precision.
Wrapper class to FCNBase interface used internally by Minuit.
Definition: MnFcn.h:33
MinimumState operator()(const MnFcn &, const MinimumState &, const GradientCalculator &, const MnMachinePrecision &) const
bool HasNegativeG2(const FunctionGradient &, const MnMachinePrecision &) const
In case that one of the components of the second derivative g2 calculated by the numerical Gradient c...
MinimumState keeps the information (position, Gradient, 2nd deriv, etc) after one minimization step (...
Definition: MinimumState.h:29
interface class for gradient calculators