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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MATH-483) FastMath does not handle all special cases correctly
Date Tue, 18 Jan 2011 01:25:43 GMT

     [ https://issues.apache.org/jira/browse/MATH-483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebb updated MATH-483:
----------------------

    Description: 
FastMath has some issues with special cases such as +0.0 and -0.0.

Here are the double cases so far found:

abs(-0.0) expected:<0.0> but was:<-0.0>
signum(-0.0) expected:<-0.0> but was:<0.0>
asin(-0.0) expected:<-0.0> but was:<0.0>
atan(-0.0) expected:<-0.0> but was:<0.0>
log10(-0.0) expected:<-Infinity> but was:<NaN>
toDegrees(-0.0) expected:<-0.0> but was:<0.0>
toRadians(-0.0) expected:<-0.0> but was:<0.0>
ulp(-Infinity) expected:<Infinity> but was:<NaN>

And float cases:
abs(-0.0) expected:<0.0> but was:<-0.0>


  was:The functions asin() and atan() are supposed to return the same sign 0 for zero argument,
but they currently return +0.0 for both.

        Summary: FastMath does not handle all special cases correctly  (was: FastMath does
not handle special case -0.0 for asin() and atan())

> FastMath does not handle all special cases correctly
> ----------------------------------------------------
>
>                 Key: MATH-483
>                 URL: https://issues.apache.org/jira/browse/MATH-483
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.1, 3.0
>            Reporter: Sebb
>         Attachments: MATH-483.patch
>
>
> FastMath has some issues with special cases such as +0.0 and -0.0.
> Here are the double cases so far found:
> abs(-0.0) expected:<0.0> but was:<-0.0>
> signum(-0.0) expected:<-0.0> but was:<0.0>
> asin(-0.0) expected:<-0.0> but was:<0.0>
> atan(-0.0) expected:<-0.0> but was:<0.0>
> log10(-0.0) expected:<-Infinity> but was:<NaN>
> toDegrees(-0.0) expected:<-0.0> but was:<0.0>
> toRadians(-0.0) expected:<-0.0> but was:<0.0>
> ulp(-Infinity) expected:<Infinity> but was:<NaN>
> And float cases:
> abs(-0.0) expected:<0.0> but was:<-0.0>

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