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Posted to issues@commons.apache.org by "Earle Nietzel (JIRA)" <ji...@apache.org> on 2016/05/27 17:49:12 UTC

[jira] [Created] (MATH-1368) equalsIncludingNaN not producing the expected result

Earle Nietzel created MATH-1368:
-----------------------------------

             Summary: equalsIncludingNaN not producing the expected result
                 Key: MATH-1368
                 URL: https://issues.apache.org/jira/browse/MATH-1368
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 2.2
            Reporter: Earle Nietzel


I wouldn't expect this result given these 2 values?

x=-1.0, y=4.0
x to long bits = -4616189618054758400
y to long bits = 4616189618054758400
x equals y = false
MathUtils.equalsIncludingNaN(x, y) = true
MathUtils.equals(x, y) = false

It appears the lexicographic ordering logic is producing this, other numbers are fine. Notice the value produced for -1.0 and 4.0 by Double.doubleToLongBits().



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