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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-376) One-time initialization in "DirectSearchOptimizer"
Date Wed, 16 Jun 2010 10:20:23 GMT

    [ https://issues.apache.org/jira/browse/MATH-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879300#action_12879300
] 

Luc Maisonobe commented on MATH-376:
------------------------------------

I agree. Go ahead to make the change, and make sure documentation is updated. It may appear
in the javadoc of this top level class as well as in the subclasses and perhaps in the user
manual (I did not check).

> One-time initialization in "DirectSearchOptimizer"
> --------------------------------------------------
>
>                 Key: MATH-376
>                 URL: https://issues.apache.org/jira/browse/MATH-376
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Gilles
>            Priority: Minor
>
> In class  "DirectSearchOptimizer" (in package "optimization.direct"), the "optimize"
method contains this code (at line 270):
> {code}
> if (startConfiguration == null) {
>     // no initial configuration has been set up for simplex
>     // build a default one from a unit hypercube
>     final double[] unit = new double[startPoint.length];
>     Arrays.fill(unit, 1.0);
>     setStartConfiguration(unit);
> }
> {code}
> I think that this has the consequence that it is impossible to call "optimize" a second
time, where one would like to solve a problem with a different dimension.

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