[HARMONY-6339] [classlib] [math] Sample test case showing Math differences

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.0M12
• Component/s: Classlib
• Assignee: Tim Ellison
• Reporter: Sebb
• Created: 09/Sep/09 12:58
• Updated: 13/Nov/09 10:58
• Resolved: 13/Nov/09 10:58

Description

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.

Issue Links

• is related to: HARMONY-5478 [classlib] [luni] Math.floor/ceil/rint can be implemented w/o JNI calls