Class SwimZStateVector

java.lang.Object

cnuphys.swimZ.SwimZStateVector

public class SwimZStateVector
extends Object

Holds the position and track slopes. The positions (x, y, z) are in cm, while the track slopes are dimensionless. Note: z is not an actual component of the "true" state vector, it is the independent variable. But it rides along here because we will want to know z at every step.

Author:

heddle

Field Summary

Fields

Modifier and Type	Field	Description
double	tx	the x track slope, px/pz
double	ty	the y track slope, py/pz
double	x	the x coordinate (cm)
double	y	the y coordinate (cm)
double	z	the z coordinate (cm)

Constructor Summary

Constructors

Constructor	Description
SwimZStateVector()	Create a state vector for the SwimZ package with all NaNs for the components
SwimZStateVector(double z, double[] v)	Create a state variable from an array (probably from RK integration)
SwimZStateVector(double x, double y, double z, double tx, double ty)	Constructor for a state vector for the SwimZ package.
SwimZStateVector(double x, double y, double z, double p, double theta, double phi)	Constructor
SwimZStateVector(SwimZStateVector sv)	Create a state variable from another (copy)

Method Summary

Modifier and Type	Method	Description
void	copy(SwimZStateVector sv)	Copy from another state vector
void	dR(SwimZStateVector zv, double[] dr)	Compute the difference between this state vector's location and another state vector's location
String	normalPrint(double p, int pzSign)
void	set(double z, double[] v)	Set the state vector
String	toString()	Get a string representation

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

x

public double x

the x coordinate (cm)

y

public double y

the y coordinate (cm)

z

public double z

the z coordinate (cm)

tx

public double tx

the x track slope, px/pz

ty

public double ty

the y track slope, py/pz

Constructor Details

SwimZStateVector

public SwimZStateVector()

Create a state vector for the SwimZ package with all NaNs for the components

SwimZStateVector

public SwimZStateVector(double x,
 double y,
 double z,
 double tx,
 double ty)

Constructor for a state vector for the SwimZ package. Note that it uses CM for distance units

Parameters:

x - the x coordinate (cm)

y - the x coordinate (cm)

z - the z coordinate (cm). Note: z is not an actual component of the state vector, it is the independent variable. But it rides along here.

tx - the x track slope, px/pz

ty - the y track slope, py/pz

SwimZStateVector

public SwimZStateVector(double z,
 double[] v)

Create a state variable from an array (probably from RK integration)

Parameters:

z - the value of z in cm. Note: z is not an actual component of the state vector, it is the independent variable. But it rides along here.

v - the array with, in order, x,y,tx,ty,q

SwimZStateVector

public SwimZStateVector(SwimZStateVector sv)

Create a state variable from another (copy)

Parameters:

sv - the state vector to copy

v - the array with, in order, x,y,tx,ty,q

SwimZStateVector

public SwimZStateVector(double x,
 double y,
 double z,
 double p,
 double theta,
 double phi)

Constructor

Parameters:

x - the x coordinate (cm)

y - the y coordinate (cm)

z - the z coordinate (cm)

p - the magnitude of the momentum in GeV/c

theta - the initial polar angle (degrees)

phi - the initial azimuthal angle(degrees)

Method Details

copy

public void copy(SwimZStateVector sv)

Copy from another state vector

Parameters:

sv - the state vector to copy

set

public void set(double z,
 double[] v)

Set the state vector

Parameters:

z - the value of z in cm. Note: z is not an actual component of the state vector, it is the independent variable. But it rides along here.

v - the array with, in order, x,y,tx,ty,

dR

public void dR(SwimZStateVector zv,
 double[] dr)

Compute the difference between this state vector's location and another state vector's location

Parameters:

zv - the other state vector

dr - will hold the delta in cm

toString

public String toString()

Get a string representation

Overrides:

toString in class Object

Returns:

a string representation of the state vector

normalPrint

public String normalPrint(double p,
 int pzSign)