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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MATH-489) FastMath acos fails when input abs value is less than about 5.7851920321187236E-300 - returns NaN
Date Mon, 24 Jan 2011 13:02:45 GMT

     [ https://issues.apache.org/jira/browse/MATH-489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebb updated MATH-489:
----------------------

    Affects Version/s: 3.0
                       2.2

> FastMath acos fails when input abs value is less than about 5.7851920321187236E-300 -
returns NaN
> -------------------------------------------------------------------------------------------------
>
>                 Key: MATH-489
>                 URL: https://issues.apache.org/jira/browse/MATH-489
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.2, 3.0
>            Reporter: Sebb
>             Fix For: 2.2, 3.0
>
>
> FastMath acos fails when input absolute value is less than about 5.7851920321187236E-300
> It returns NaN instead of an expected value close to PI/2.0
> This appears to be due to the following code:
> {code}
> // Compute ratio r = y/x
> double r = y/x;
> temp = r * 1073741824.0;
> {code}
> r and temp can become infinite or Nan.

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