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From "Thomas Vandahl (JIRA)" <j...@apache.org>
Subject [jira] Created: (LANG-381) NumberUtils.min(floatArray) returns wrong value if floatArray[0] happens to be Float.NaN
Date Fri, 30 Nov 2007 13:17:43 GMT
NumberUtils.min(floatArray) returns wrong value if floatArray[0] happens to be Float.NaN
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                 Key: LANG-381
                 URL: https://issues.apache.org/jira/browse/LANG-381
             Project: Commons Lang
          Issue Type: Bug
    Affects Versions: 2.3
            Reporter: Thomas Vandahl


The min() method of NumberUtils returns the wrong result if  the first value of the array
happens to be Float.NaN. The following code snippet shows the behaviour:

        float a[] = new float[] {(float) 1.2, Float.NaN, (float) 3.7, (float) 27.0, (float)
42.0, Float.NaN};
        float b[] = new float[] {Float.NaN, (float) 1.2, Float.NaN, (float) 3.7, (float) 27.0,
(float) 42.0, Float.NaN};
        
        float min = NumberUtils.min(a);
        System.out.println("min(a): " + min); // output: 1.2
        min = NumberUtils.min(b);
        System.out.println("min(b): " + min); // output: NaN

This problem may exist for double-arrays as well. 

Proposal: Use Float.compare(float, float) or NumberUtils.compare(float, float) to achieve
a consistent result.


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