ROOT::Minuit2::MnMachinePrecision Class Reference

Description

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

Constructor & Destructor Documentation

MnMachinePrecision() [1/2]

ROOT::Minuit2::MnMachinePrecision::MnMachinePrecision

(

)

~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.

: fEpsMac(prec.fEpsMac), fEpsMa2(prec.fEpsMa2) {}

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.

{return fEpsMac;}

References fEpsMac.

Eps2()

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

inline

eps2 returns 2*sqrt(eps)

Definition at line 47 of file MnMachinePrecision.h.

{return fEpsMa2;}

References fEpsMa2.

operator=()

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

inline

Definition at line 37 of file MnMachinePrecision.h.

                                                                {
    fEpsMac = prec.fEpsMac;
    fEpsMa2 = prec.fEpsMa2;
    return *this;
  }

References fEpsMa2, and fEpsMac.

SetPrecision()

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

inline

override Minuit's own determination

Definition at line 50 of file MnMachinePrecision.h.

                                 {
    fEpsMac = prec;
    fEpsMa2 = 2.*sqrt(fEpsMac);
  }

References fEpsMa2, and fEpsMac.

Referenced by ROOT::Minuit2::MnUserTransformation::SetPrecision().

Member Data Documentation

fEpsMa2

double ROOT::Minuit2::MnMachinePrecision::fEpsMa2

private

Definition at line 58 of file MnMachinePrecision.h.

Referenced by Eps2(), operator=(), and SetPrecision().

fEpsMac

double ROOT::Minuit2::MnMachinePrecision::fEpsMac

private

Definition at line 57 of file MnMachinePrecision.h.

Referenced by Eps(), operator=(), and SetPrecision().

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

• /home/build/builds/o5h8MZZm/0/mlz/bornagain/Fit/3rdparty/RootMinimizers/Minuit2/MnMachinePrecision.h