FactorialMoments
jhplot.stat

Class FactorialMoments



  • public class FactorialMomentsextends 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

      Methods 
      Modifier and TypeMethod and Description
      voiddoc()
      Show online documentation.
      booleaneval()
      Evaluate factorial moments at the end of the run
      P1DgetAv()
      Return average multiplicity as a function of bin
      P1DgetFM(int order)
      Return factorial moments (without normalization): log(FM) as a function of number of bins.
      P1DgetNFM(int order)
      Return results: NFM as a function of number of bins.
      voidrun(double[] v)
      Collect information about sampling.
    • 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.

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