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https://issues.apache.org/jira/browse/MATH-713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157713#comment-13157713
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Luc Maisonobe edited comment on MATH-713 at 11/27/11 9:29 AM:
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Could you please check this against the latest development version from the
subversion repository ?
There have been several fixes concerning these coefficients in simplex solver
since 2.2
was (Author: luc):
Could you please check this agains the latest development version from the
subversion repository ?
There have been several fixes concerning these coefficients in simplex solver
since 2.2
> 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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