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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2010/07/26 14:19:50 UTC

[jira] Commented: (MATH-395) Bugs in "BrentOptimizer"

    [ https://issues.apache.org/jira/browse/MATH-395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892283#action_12892283 ] 

Gilles commented on MATH-395:
-----------------------------

Bugs corrected in revision 979257.
Not resolving yet because the implementation still does not behave as the Python one. I've added a unit test that indicates the discrepancies (with "XXX" markers).


> Bugs in "BrentOptimizer"
> ------------------------
>
>                 Key: MATH-395
>                 URL: https://issues.apache.org/jira/browse/MATH-395
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.1
>            Reporter: Gilles
>            Assignee: Gilles
>             Fix For: 2.2
>
>
> I apologize for having provided a buggy implementation of Brent's optimization algorithm (class "BrentOptimizer" in package "optimization.univariate").
> The unit tests didn't show that there was something wrong, although (from the "changes.xml" file) I discovered that, at the time, Luc had noticed something weird in the implementation's behaviour.
> Comparing with an implementation in Python, I could figure out the fixes. I'll modify "BrentOptimizer" and add a test. I also propose to change the name of the unit test class from "BrentMinimizerTest" to "BrentOptimizerTest".

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