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https://issues.apache.org/jira/browse/MATH-489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luc Maisonobe closed MATH-489.
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Closing issue as it was included in version 2.2, which has been released
> 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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