1 package org.lcsim.math.distribution;
2
3 import java.util.Random;
4
5 public class MoyalDistribution
6 {
7
8 private String[] parameters = {"N", "x0", "sigma"};
9 private double[] parValues = {1, 1, 1};
10 private String title = "MoyalDistribution";
11 private String[] variables = {"x"};
12
13 public double value(double x)
14 {
15 double var = x;
16 double n = parValues[0];
17 double x0 = parValues[1];
18 double s = parValues[2];
19 double lambda = (var-x0)/s;
20 double arg = lambda + Math.exp( -1.*lambda );
21 double num = Math.exp( -1.*arg );
22 return n*Math.sqrt( num/(2*Math.PI) );
23 }
24
25 }