ROOT::Minuit2::MnParabola Class Reference

This class defines a parabola of the form a*x*x + b*x + c.

Author

Fred James and Matthias Winkler; comments added by Andras Zsenei and Lorenzo Moneta

Definition at line 30 of file MnParabola.h.

Public Member Functions
	MnParabola (double a, double b, double c)
	Constructor that initializes the parabola with its three parameters.
	~MnParabola ()
double	A () const
	Accessor to the coefficient of the quadratic term.
double	B () const
	Accessor to the coefficient of the linear term.
double	C () const
	Accessor to the coefficient of the constant term.
double	Min () const
	Calculates the x coordinate of the Minimum of the parabola.
double	X_neg (double y) const
	Calculates the smaller of the two x values corresponding to the given y Value.
double	X_pos (double y) const
	Calculates the bigger of the two x values corresponding to the given y Value.
double	Y (double x) const
	Evaluates the parabola a the point x.
double	YMin () const
	Calculates the y coordinate of the Minimum of the parabola.

Private Attributes
double	fA
double	fB
double	fC

#include <Minuit2/MnParabola.h>

Constructor & Destructor Documentation

MnParabola()

ROOT::Minuit2::MnParabola::MnParabola ( double a, double b, double c )

inline

Constructor that initializes the parabola with its three parameters.

Parameters

a	the coefficient of the quadratic term
b	the coefficient of the linear term
c	the constant

Definition at line 43 of file MnParabola.h.

~MnParabola()

ROOT::Minuit2::MnParabola::~MnParabola ( )

inline

Definition at line 45 of file MnParabola.h.

Member Function Documentation

A()

double ROOT::Minuit2::MnParabola::A ( ) const

inline

Accessor to the coefficient of the quadratic term.

Returns

the coefficient of the quadratic term.

Definition at line 127 of file MnParabola.h.

B()

double ROOT::Minuit2::MnParabola::B ( ) const

inline

Accessor to the coefficient of the linear term.

Returns

the coefficient of the linear term.

Definition at line 137 of file MnParabola.h.

C()

double ROOT::Minuit2::MnParabola::C ( ) const

inline

Accessor to the coefficient of the constant term.

Returns

the coefficient of the constant term.

Definition at line 147 of file MnParabola.h.

Min()

double ROOT::Minuit2::MnParabola::Min ( ) const

inline

Calculates the x coordinate of the Minimum of the parabola.

Returns

x coordinate of the Minimum.

Definition at line 107 of file MnParabola.h.

X_neg()

double ROOT::Minuit2::MnParabola::X_neg ( double y ) const

inline

Calculates the smaller of the two x values corresponding to the given y Value.

???????!!!!!!!!! And when there is none?? it looks like it will crash?? what is sqrt (-1.0) ?

Parameters

y	the y Value for which the x Value is to be calculated.

Returns

the smaller one of the two corresponding values.

Definition at line 97 of file MnParabola.h.

X_pos()

double ROOT::Minuit2::MnParabola::X_pos ( double y ) const

inline

Calculates the bigger of the two x values corresponding to the given y Value.

???????!!!!!!!!! And when there is none?? it looks like it will crash?? what is sqrt (-1.0) ?

Parameters

y	the y Value for which the x Value is to be calculated.

Returns

the bigger one of the two corresponding values.

Definition at line 77 of file MnParabola.h.

Y()

double ROOT::Minuit2::MnParabola::Y ( double x ) const

inline

Evaluates the parabola a the point x.

Parameters

x	the coordinate where the parabola needs to be evaluated.

Returns

the y coordinate of the parabola corresponding to x.

Definition at line 57 of file MnParabola.h.

YMin()

double ROOT::Minuit2::MnParabola::YMin ( ) const

inline

Calculates the y coordinate of the Minimum of the parabola.

Returns

y coordinate of the Minimum.

Definition at line 117 of file MnParabola.h.

Member Data Documentation

fA

double ROOT::Minuit2::MnParabola::fA

private

Definition at line 150 of file MnParabola.h.

fB

double ROOT::Minuit2::MnParabola::fB

private

Definition at line 151 of file MnParabola.h.

fC

double ROOT::Minuit2::MnParabola::fC

private

Definition at line 152 of file MnParabola.h.

Libraries for ROOT::Minuit2::MnParabola:

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

• math/minuit2/inc/Minuit2/MnParabola.h