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From Michał Skrzypczak (Commented) (JIRA) <j...@apache.org>
Subject [jira] [Commented] (MATH-713) Negative value with restrictNonNegative
Date Mon, 28 Nov 2011 10:54:39 GMT

    [ https://issues.apache.org/jira/browse/MATH-713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13158340#comment-13158340
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Michał Skrzypczak commented on MATH-713:
----------------------------------------

I'm quite busy at work now... When I'll find some time, I'll try to test it. Of course I'd
be glad if one of developers would do it before :)
                
> Negative value with restrictNonNegative
> ---------------------------------------
>
>                 Key: MATH-713
>                 URL: https://issues.apache.org/jira/browse/MATH-713
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.2
>         Environment: commons-math-2.2
>            Reporter: Michał Skrzypczak
>              Labels: nonnegative, simplex, solver
>   Original Estimate: 3h
>  Remaining Estimate: 3h
>
> Problem: commons-math-2.2 SimplexSolver.
> A variable with 0 coefficient may be assigned a negative value nevertheless restrictToNonnegative
flag in call:
> SimplexSolver.optimize(function, constraints, GoalType.MINIMIZE, true);
> Function
> 1 * x + 1 * y + 0
> Constraints:
> 1 * x + 0 * y = 1
> Result:
> x = 1; y = -1;
> Probably variables with 0 coefficients are omitted at some point of computation and because
of that the restrictions do not affect their values.

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