ROOT::Minuit2::MnMachinePrecision Class Reference

determines the relative floating point arithmetic precision.

The SetPrecision() method can be used to override Minuit's own determination, when the user knows that the {FCN} function Value is not calculated to the nominal machine accuracy.

Definition at line 27 of file MnMachinePrecision.h.

Public Member Functions
	MnMachinePrecision ()
	MnMachinePrecision (const MnMachinePrecision &prec)
	~MnMachinePrecision ()
double	Eps () const
	eps returns the smallest possible number so that 1.+eps > 1. More...
double	Eps2 () const
	eps2 returns 2*sqrt(eps) More...
MnMachinePrecision &	operator= (const MnMachinePrecision &prec)
void	SetPrecision (double prec)
	override Minuit's own determination More...

Private Attributes
double	fEpsMa2
double	fEpsMac

#include <Minuit2/MnMachinePrecision.h>

Constructor & Destructor Documentation

MnMachinePrecision() [1/2]

ROOT::Minuit2::MnMachinePrecision::MnMachinePrecision

(

)

Definition at line 18 of file MnMachinePrecision.cxx.

~MnMachinePrecision()

ROOT::Minuit2::MnMachinePrecision::~MnMachinePrecision ( )

inline

Definition at line 33 of file MnMachinePrecision.h.

MnMachinePrecision() [2/2]

ROOT::Minuit2::MnMachinePrecision::MnMachinePrecision ( const MnMachinePrecision &  prec )

inline

Definition at line 35 of file MnMachinePrecision.h.

Member Function Documentation

Eps()

double ROOT::Minuit2::MnMachinePrecision::Eps ( ) const

inline

eps returns the smallest possible number so that 1.+eps > 1.

Definition at line 44 of file MnMachinePrecision.h.

Eps2()

double ROOT::Minuit2::MnMachinePrecision::Eps2 ( ) const

inline

eps2 returns 2*sqrt(eps)

Definition at line 47 of file MnMachinePrecision.h.

operator=()

MnMachinePrecision& ROOT::Minuit2::MnMachinePrecision::operator= ( const MnMachinePrecision &  prec )

inline

Definition at line 37 of file MnMachinePrecision.h.

SetPrecision()

void ROOT::Minuit2::MnMachinePrecision::SetPrecision ( double  prec )

inline

override Minuit's own determination

Definition at line 50 of file MnMachinePrecision.h.

Member Data Documentation

fEpsMa2

double ROOT::Minuit2::MnMachinePrecision::fEpsMa2

private

Definition at line 58 of file MnMachinePrecision.h.

fEpsMac

double ROOT::Minuit2::MnMachinePrecision::fEpsMac

private

Definition at line 57 of file MnMachinePrecision.h.

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The documentation for this class was generated from the following files:

• math/minuit2/inc/Minuit2/MnMachinePrecision.h
• math/minuit2/src/MnMachinePrecision.cxx