[jira] [Commented] (MATH-872) "inputSigma" specification in "CMAESOptimizer"

["Gilles (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467244#comment-13467244 ] 

Gilles commented on MATH-872:
-----------------------------

If there aren't any objections, I would add the accessor and deprecate the constructors that set "inputSigma" (to be removed in 4.0).
                
> "inputSigma" specification in "CMAESOptimizer"
> ----------------------------------------------
>
>                 Key: MATH-872
>                 URL: https://issues.apache.org/jira/browse/MATH-872
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>
> The interface to the CM optimizers was designed to allow multiple "optimize" calls to the same optimizer with
> * different functions (even with a different number of parameters),
> * different start points,
> * different boundaries.
> "inputSigma" however depends on the number of parameters, and possibly on the start point and on the values of the upper and lower bounds. Specifying it at construction is slightly inconsistent with the intent of the API.
> One workaround is to have a separate accessor:
> {code}
> public void setSigma(double[] sigma)
> {code}

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