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From "Tim Ellison (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HARMONY-6339) [classlib] [math] Sample test case showing Math differences
Date Fri, 13 Nov 2009 11:00:39 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-6339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tim Ellison resolved HARMONY-6339.
----------------------------------

    Resolution: Fixed

> [classlib] [math] Sample test case showing Math differences
> -----------------------------------------------------------
>
>                 Key: HARMONY-6339
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6339
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>            Reporter: Sebb
>            Assignee: Tim Ellison
>             Fix For: 5.0M12
>
>
> Below is a simple test case which works in the Sun Java 1.5 but fails in Harmony.
> This is derived from the HyperGeometricDistribution test, but is hopefully a bit easier
to debug.
> import org.apache.commons.math.util.MathUtils;
> public class HarmMath {
>     private static void bcl(int m, int x, double exp){
>         final double logmx = MathUtils.binomialCoefficientLog(m, x);
>         System.out.println(m+","+x+"="+logmx+" "+(logmx==exp?" == ":" != ")+" "+exp);
>     }
>     public static void main(String[] args) {
>         int[][]mk={{101,84},{101,83},{101,60},{101,18},{101,17}};
>         double[]r={43.52547252799755,45.065917568944705,65.69211086727145,45.065917568944705,43.52547252799755};
>         for(int j=0; j<mk.length;j++){
>             bcl(mk[j][0],mk[j][1],r[j]);
>         }
>     }
> }
> The cases 101,83; 101,60; and 101,18 generate different results on Harmony.

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