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From "Dimitri Pourbaix (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MATH-406) Wrong weight handling in Levenberg-Marquardt
Date Sat, 14 Aug 2010 22:04:16 GMT

     [ https://issues.apache.org/jira/browse/MATH-406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dimitri Pourbaix resolved MATH-406.
-----------------------------------

    Resolution: Fixed

> Wrong weight handling in Levenberg-Marquardt
> --------------------------------------------
>
>                 Key: MATH-406
>                 URL: https://issues.apache.org/jira/browse/MATH-406
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.1
>            Reporter: Dimitri Pourbaix
>            Assignee: Dimitri Pourbaix
>             Fix For: Nightly Builds
>
>         Attachments: MATH-406.patch
>
>
> A comparison with a Fortran version of Levenberg-Marquardt reveals that when observations
have different weights, the 2.1 version reaches a value of the function which does not necessary
correspond to the minimum

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