hephysics.vec
Class Hep3Vector

java.lang.Object
  hephysics.vec.Hep3Vector

All Implemented Interfaces:

Serializable

public class Hep3Vector
extends Object
implements Serializable

Basic implementation of a Hep3Vector

See Also:

Serialized Form

Constructor Summary

Hep3Vector()
New 3-vector

Hep3Vector(double[] d)
Create a BasicHep3Vector from a double array

Hep3Vector(double dx, double dy, double dz)
Define a 3-vector

Hep3Vector(float[] f)
Define a new vector

Method Summary

double	abs() Magnitude
void	add(Hep3Vector v) Add a vector
Hep3Vector	add(Hep3Vector v, Hep3Vector w) Add 2 vectors and return a new object
double	angle(Hep3Vector momentum) Angle between 2 vectors
HepLorentzVector	boost(HepLorentzVector fourVector, Hep3Vector boostVector) Boost fourVector with boostVector.
HepLorentzVector	boost(HepLorentzVector fourVector, HepLorentzVector refFourVector) Boost fourVector into system of refFourVector.
Hep3Vector	centerOfMass(List<Hep3Vector> vecSet) Return a center of mass of a list of vectors
Hep3Vector	copy(Hep3Vector p) New copy
double	cosTheta() cosTheta
double	cosTheta(Hep3Vector vector) Cosine Theta
Hep3Vector	cross(Hep3Vector v, Hep3Vector w) Cross product of 2 vectors
double	dot(Hep3Vector p) Dot operation
double	dot(Hep3Vector v, Hep3Vector w) Dot product of 2 vectors
boolean	equals(Object obj)
double	getEta()
int	hashCode()
double	mag()
double	mag2()
double	magnitudeSquared()
void	mult(double scalar) Multiply by a scaler
Hep3Vector	mult(double scalar, Hep3Vector v) Multiply by a scaler
Hep3Vector	mult(Hep3Matrix m, Hep3Vector v)
Hep3Vector	neg(Hep3Vector v) Invert
double	perp() Transverse
double	perp2() Transverse
double	phi() Phi
double	pseudoRapidity() Pseudorapidity.
double	rapidity() Rapidity.
void	setPhi(double ph) Set phi
void	setV(double dx, double dy, double dz) Set vector
void	setX(double x) Set X component
void	setY(double y) Y component
void	setZ(double z) Set Z component
void	sub(Hep3Vector v) Subtract
Hep3Vector	sub(Hep3Vector v, Hep3Vector w) Subtract
double	theta() angle theta (=atan2(perp(),z)
String	toString()
Hep3Vector	unit(Hep3Vector v) returns (0,0,0) vector if input vector has length 0
double[]	v()
double	x()
double	y()
double	z()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Hep3Vector

public Hep3Vector()

New 3-vector

Hep3Vector

public Hep3Vector(double dx,
                  double dy,
                  double dz)

Define a 3-vector

Parameters:

dx -

dy -

dz -

Hep3Vector

public Hep3Vector(double[] d)

Create a BasicHep3Vector from a double array

Parameters:

d - An array {x,y,z}

Hep3Vector

public Hep3Vector(float[] f)

Define a new vector

Parameters:

f -

Method Detail

abs

public double abs()

Magnitude

Returns:

copy

public Hep3Vector copy(Hep3Vector p)

New copy

Parameters:

p -

Returns:

cosTheta

public double cosTheta()

cosTheta

Returns:

phi

public double phi()

Phi

Returns:

unit

public Hep3Vector unit(Hep3Vector v)

returns (0,0,0) vector if input vector has length 0

neg

public Hep3Vector neg(Hep3Vector v)

Invert

Parameters:

v -

Returns:

add

public Hep3Vector add(Hep3Vector v,
                      Hep3Vector w)

Add 2 vectors and return a new object

Parameters:

v -

w -

Returns:

new object

add

public void add(Hep3Vector v)

Add a vector

Parameters:

v -

sub

public void sub(Hep3Vector v)

Subtract

Parameters:

v -

sub

public Hep3Vector sub(Hep3Vector v,
                      Hep3Vector w)

Subtract

Parameters:

v -

w -

Returns:

mult

public Hep3Vector mult(double scalar,
                       Hep3Vector v)

Multiply by a scaler

Parameters:

scalar -

v -

Returns:

mult

public void mult(double scalar)

Multiply by a scaler

Parameters:

scalar -

centerOfMass

public Hep3Vector centerOfMass(List<Hep3Vector> vecSet)

Return a center of mass of a list of vectors

Parameters:

vecSet -

Returns:

cross

public Hep3Vector cross(Hep3Vector v,
                        Hep3Vector w)

Cross product of 2 vectors

Parameters:

v - vector 1

w - vector 2

Returns:

cross product

dot

public double dot(Hep3Vector v,
                  Hep3Vector w)

Dot product of 2 vectors

Parameters:

v - vector 1

w - vector 2

Returns:

product

perp

public double perp()

Transverse

Returns:

dot

public double dot(Hep3Vector p)

Dot operation

Parameters:

p -

Returns:

perp2

public double perp2()

Transverse

Returns:

angle

public double angle(Hep3Vector momentum)

Angle between 2 vectors

Parameters:

momentum -

Returns:

setV

public void setV(double dx,
                 double dy,
                 double dz)

Set vector

Parameters:

dx -

dy -

dz -

x

public double x()

y

public double y()

z

public double z()

setX

public void setX(double x)

Set X component

Parameters:

x -

boost

public HepLorentzVector boost(HepLorentzVector fourVector,
                              Hep3Vector boostVector)

Boost fourVector with boostVector. Note, that beta=abs(boostVector) needs to be 0 < beta < 1.

boost

public HepLorentzVector boost(HepLorentzVector fourVector,
                              HepLorentzVector refFourVector)

Boost fourVector into system of refFourVector.

mult

public Hep3Vector mult(Hep3Matrix m,
                       Hep3Vector v)

setY

public void setY(double y)

Y component

Parameters:

y -

setZ

public void setZ(double z)

Set Z component

Parameters:

z -

mag2

public double mag2()

theta

public double theta()

angle theta (=atan2(perp(),z)

Returns:

cosTheta

public double cosTheta(Hep3Vector vector)

Cosine Theta

Parameters:

vector -

Returns:

setPhi

public void setPhi(double ph)

Set phi

Parameters:

ph - phi in radians

pseudoRapidity

public double pseudoRapidity()

Pseudorapidity. eta=-ln (tan (theta/2)) )

Returns:

rapidity

public double rapidity()

Rapidity. 0.5*log( (m+z)/(m-z) );

Returns:

getEta

public double getEta()

mag

public double mag()

magnitudeSquared

public double magnitudeSquared()

v

public double[] v()

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object