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Date: Tue, 15 Jun 2010 15:27:26 -0400 (EDT)
From: "Luc Maisonobe (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Commented: (MATH-376) One-time initialization in
 "DirectSearchOptimizer"
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    [ https://issues.apache.org/jira/browse/MATH-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879084#action_12879084 ] 

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

This code is here only for the case setStartConfiguration has not been called by the user, which is not the recommended way.
This behaviour is documented in the javadoc of the class. The case of multiple calls with different problems size is explained: in this case users must call setStartConfiguration.

> 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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