I am struggling to access the nonlinear solvers provided within OpenSolver. Where do I download the bonmin.exe for the COIN-OR Bonmin Non-Linear solver to run it within excel? When I attempt to access the NEOS using Bonmin solver it states that it cannot connect to the NEOS server at this time. Do all of the non-linear solvers leverage a third party to find the solution? If so how efficient (time-wise) are they at returning solutions. I am looking to iterate through a loop solving multiple problems.

Thank you so much for taking the time to answer my questions.

]]>Would it be possible to use OpenSolver in excel to solve a relatively large linear program.

I want to solve an linear program with about 175 000 variables and 200 000 constraints. Would this be feasible with OpenSolver?

Thank you,

Jonas

]]>First of all, thank you for this wonderful tool. I’ve made a wonderful tool with it, that I would like to make available to users on an Ipad. I was wondering if there is any work being done, or progress to report on making opensolver work with the free version excel for Ipad?

Thanks and best regards

]]>OpenSolver 2.8.5 encountered an error:

Out of stack space

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any hints to solve this?

thanks!

]]>`RHSFormula`

rather than `FormulaText`

:
`OpenSolver.AddConstraint Sheet.range("D28"), RelationLE, RHSFormula:="$D$29*$D$30"`

I have tried:

Dim string1 As String

string1 = “$D$29*$D$30”

‘OpenSolver.AddConstraint Sheet.range(“D28”), RelationLE, Sheet.range(“D28”)*Sheet.range(“D29”)

‘OpenSolver.AddConstraint Sheet.range(“D28”), RelationLE, (Sheet.range(“D28”)*Sheet.range(“D29”))

‘OpenSolver.AddConstraint Sheet.range(“D28”), RelationLE, Sheet.range(“D28*D29”)

‘OpenSolver.AddConstraint Sheet.range(“D28″), RelationLE, FormulaText:=”$D$29*$D$30”

OpenSolver.AddConstraint Sheet.range(“D28″), RelationLE, string1

‘SolverAdd CellRef:=”$D$28″, Relation:=1, FormulaText:=”$D$29*$D$30” ‘Learned from regular excel solver recording.

But none of the above do the trick, and recording a macro where I manually set the multiplication constraint in the opensolver model does not record anything, so I can’t learn from that syntax.

So if someone would happen to know how to programmatically add the constraint in the RHS where the multiplication of two cells is set, I would appreciate the information ðŸ™‚

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