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Luc Maisonobe edited comment on MATH-713 at 11/27/11 9:29 AM: -------------------------------------------------------------- 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: MichaĆ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira