Java Random multSample(Random rng, double[] vals, double normsum)

Description

Draw a multinomial sample from (un-normalized) vals

License

Open Source License

Parameter

Parameter	Description
rng	a parameter
vals	a parameter
normsum	a parameter

Declaration

public static int multSample(Random rng, double[] vals, double normsum) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.*;

public class Main {
    /**// w w w  . ja  va  2 s  .c  o  m
     * Draw a multinomial sample from (un-normalized) vals
     * 
     * @param rng
     * @param vals
     * @param normsum
     * @return
     */
    public static int multSample(Random rng, double[] vals, double normsum) {
        double rval = rng.nextDouble() * normsum;
        double cumsum = 0;
        int j = 0;
        while (cumsum < rval || j == 0) {
            cumsum += vals[j];
            j++;
        }
        return j - 1;
    }
}

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