jhplot.stat

Class FactorialMoments

java.lang.Object

jhplot.stat.FactorialMoments

public class FactorialMoments
extends Object

Normalised factorial moments (NFM). They characterise local multiplicity fluctuations inside a restricted phase space. It can calculate factorial moments (getFM() method) or normalized factorial moment (getNFM() method). The original version with horizontal binning was proposed in: A.Bialas, R.Peschanski, Nucl. Phys. B273 (1986) 703 B308 (1988) 857

Constructor Summary

Constructors

Constructor and Description
FactorialMoments(int NmaxOrder, int Bins, int step, double Min, double Max) Initialize factorial-moment calculations.

Method Summary

Modifier and Type	Method and Description
void	doc() Show online documentation.
boolean	eval() Evaluate factorial moments at the end of the run
P1D	getAv() Return average multiplicity as a function of bin
P1D	getFM(int order) Return factorial moments (without normalization): log(FM) as a function of number of bins.
P1D	getNFM(int order) Return results: NFM as a function of number of bins.
void	run(double[] v) Collect information about sampling.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FactorialMoments

public FactorialMoments(int NmaxOrder,
                        int Bins,
                        int step,
                        double Min,
                        double Max)

Initialize factorial-moment calculations.

Parameters:

NmaxOrder - Maximum order of factorial moments for the calculations

Bins - Defines Max number of bins used to divide the phase space (>1). The actual number of divisions is step*Bins. Therefore, 10 bins with step=4 means 400 divisions between Min and Max

step - used to increase step for divisions

Min - Min value in X

Max - Max value in X

Method Detail

run

public void run(double[] v)

Collect information about sampling. Put this method in a loop and pass vector with particle characteristics.

Parameters:

v - - vector characterizing particles (like momentum, speed etc)

eval

public boolean eval()

Evaluate factorial moments at the end of the run

Returns:

true if success

getNFM

public P1D getNFM(int order)

Return results: NFM as a function of number of bins. The order should be >1 but smaller than 5;

Parameters:

order - order of normalized factorial moment (from 2-5)

Returns:

normalized factorial moment

getFM

public P1D getFM(int order)

Return factorial moments (without normalization): log(FM) as a function of number of bins. The order should be >1 but smaller than 5;

Parameters:

order - order of factorial moment (from 2-10)

Returns:

factorial moment

getAv

public P1D getAv()

Return average multiplicity as a function of bin

Returns:

average multiplicity in bins

doc

public void doc()

Show online documentation.