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From "Benjamin McCann (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MATH-246) Simplex Method Implementation
Date Fri, 27 Mar 2009 03:05:50 GMT

     [ https://issues.apache.org/jira/browse/MATH-246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benjamin McCann updated MATH-246:
---------------------------------

    Attachment: SimplexSolverTest.patch
                SimplexTableau.patch

Hi Luc,
What you did was fine.  It exposed a bug, which I've attached a patch for.
In the large test, there were multiple variables that could have taken a given value.  For
example, when we solved the problem let's say it turned out that one of two cases could be
true:
x2 = 0 and x3 = 49
x2 = 49 and x3 = 0
In this ambiguous case, I was setting x2 and x3 to 49.  The patch makes it so that we just
choose the first variable when settings its value from the solution.

> Simplex Method Implementation
> -----------------------------
>
>                 Key: MATH-246
>                 URL: https://issues.apache.org/jira/browse/MATH-246
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Benjamin McCann
>            Assignee: Luc Maisonobe
>             Fix For: 2.0
>
>         Attachments: newfiles.zip, SimplexSolverTest.patch, SimplexTableau.patch
>
>
> I've created an implementation of the Simplex algorithm for optimizing systems of constrained
linear equations that I'd like to contribute.

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