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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2015/04/09 14:40:12 UTC

[jira] [Resolved] (MATH-1206) Cost in least-squares fitting

     [ https://issues.apache.org/jira/browse/MATH-1206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilles resolved MATH-1206.
--------------------------
    Resolution: Fixed

Methods added in commit 0a499402d707bc8cf775d7f9b3840780a7401f7d

> Cost in least-squares fitting
> -----------------------------
>
>                 Key: MATH-1206
>                 URL: https://issues.apache.org/jira/browse/MATH-1206
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.3, 3.4, 3.4.1
>            Reporter: Gilles
>            Assignee: Gilles
>             Fix For: 4.0
>
>         Attachments: MATH-1206.patch, MATH-1206.patch
>
>
> In {{org.apache.commons.math4.fitting.leastsquares.AbstractEvaluation}}, the value returned by the "getCost" method is not consistent with the definition of "cost" in a least-squares problem: It is the sum of the squares of the residuals, but the method returns the square-root of that quantity.



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