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Posted to issues@commons.apache.org by "Earle Nietzel (JIRA)" <ji...@apache.org> on 2016/05/31 22:58:12 UTC
[jira] [Comment Edited] (MATH-1368) equalsIncludingNaN not
producing the expected result
[ https://issues.apache.org/jira/browse/MATH-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15308806#comment-15308806 ]
Earle Nietzel edited comment on MATH-1368 at 5/31/16 10:57 PM:
---------------------------------------------------------------
Just to circle back, I tested this with commons-math3 3.6.1 and it performs appropriately.
{code}
x=-1.0, y=4.0
Double.doubleToLongBits(x) = -4616189618054758400
Double.doubleToLongBits(y) = 4616189618054758400
x.equals(y) = false
Precision.equalsIncludingNaN(x, y) = false
Precision.equals(x, y) = false
{code}
was (Author: enietzel):
Just to circle back, I tested this with commons-math3 3.6.1 and it performs appropriately.
x=-1.0, y=4.0
Double.doubleToLongBits(x) = -4616189618054758400
Double.doubleToLongBits(y) = 4616189618054758400
x.equals(y) = false
Precision.equalsIncludingNaN(x, y) = false
Precision.equals(x, y) = false
> 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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