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Welcome to OpenSolver, the Open Source linear, integer and non-linear optimizer for Microsoft Excel.

The latest stable version,OpenSolver 2.9.0(12 Jan 2018) is available for download; this adds the SolveEngine from Satalia as a solver. Refer to the release blog for the new 2.7, 2.8, 2.8.3,2.8.4, 2.8.5 & 2.8.6 improvements. View all releases.

OpenSolver for Google Sheets; see our dedicated OpenSolver for Google Sheets page for more info on the Google Sheets versions of OpenSolver.

COIN-OR Cup Winner: We are pleased to announce that OpenSolver is the winner of the 2011 INFORMS COIN-OR Cupsponsored by IBM. Thanks, COIN-OR, for this honour.

OpenSolver is an Excel VBA add-in that extends Excel’s built-in Solver with more powerful solvers. It is developed and maintained by Andrew Mason and students at the Engineering Science department, University of Auckland, NZ. Recent developments are courtesy of Jack Dunn at MIT.

OpenSolver provides the following features:

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• OpenSolver offers a range of solvers for use in Excel, including the excellent, Open Source, COIN-ORCBC optimization engine which can quickly solve large Linear and Integer problems.
• Compatible with your existing Solver models, so there is no need to change your spreadsheets
• No artificial limits on the size of problem you can solve
• OpenSolver is free, open source software.

As well as providing replacement optimization engines, OpenSolver offers:

• A built-in model visualizer that highlights your model’s decision variables, objective and constraints directly on your spreadsheet
• A fast QuickSolve mode that makes it much faster to re-solve your model after making changes
• An algorithm to build and update the model only using information present on the sheet
• A modelling tool that we think improves on the built-in Solver window

OpenSolver has been developed for Excel 2007/2010/2013/2016 (including the 64bit versions) running on Windows, and supports Excel for Mac 2011 on Mac OS X, with limited support for Excel for Mac 2016. We currently test against Excel 2010/2013/2016 on Windows 7 and Windows 10, and Excel 2011/2016 on OS X 10.7 through 10.11. Note that we do not check our code against other versions of Excel or Windows/Mac than these. This means we cannot guarantee that the latest release will work on old versions. However, please give it a go and let us know of any problems so we can fix them.

You can download OpenSolver.zip (which is hosted on our Open Solver Source Forge site). Version details (and dates of updates) are shown on the blog page.

SolverStudio is a free alternative to OpenSolver that is better suited to larger problems. Available as a free download, SolverStudio lets you use Excel to edit, save and solve optimisation models built using modelling languages such as the Python-based PuLP, AMPL, GAMS, GMPL, COOPR/Pyomo and Gurobi’s Python interface. The latest release allows GAMS and AMPL modesl to be solved in the cloud using the excellent free NEOS servers. The SolverStudio interface is fully Excel-based, with the model being edited and run from Excel and stored inside the Excel file. This approach provides a much better modelling solution for complex optimisation problems. Check out the screen shots to see how it works. SolverStudio is much better and faster for large problems. However, OpenSolver is still a great tool for simpler models, or spreadsheets that must be compatible with the built-in Solver.

OpenSolver is being developed by Andrew Mason in the Department of Engineering Science at the University of Auckland, and Iain Dunning. Kat Gilbert also made valuable contributions to the code while working as a summer student. Current development is lead by Jack Dunn from MIT. Development of OpenSolver is made easier by the excellent Excel Name Manager which displays all the hidden worksheet names used to store an optimization model.

OpenSolver is released as open source code under the GPL. This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. OpenSolver uses a range of solvers, information on these is available here.

Citing OpenSolver: Continued development of OpenSolver is only possible if we can demonstrate its impact. If you are publishing work that uses OpenSolver, please cite both this opensolver.org website and this paper:

Mason, A.J., “OpenSolver – An Open Source Add-in to Solve Linear and Integer Progammes in Excel”, Operations Research Proceedings 2011, eds. Klatte, Diethard, Lüthi, Hans-Jakob, Schmedders, Karl, Springer Berlin Heidelberg
pp 401-406, 2012, http://dx.doi.org/10.1007/978-3-642-29210-1_64, http://opensolver.org

Latex Reference

@INCOLLECTION{OpenSolver,
author = {Mason, AndrewJ},
title = {OpenSolver – An Open Source Add-in to Solve Linear and Integer Progammes
in Excel},
booktitle = {Operations Research Proceedings 2011},
publisher = {Springer Berlin Heidelberg},
year = {2012},
editor = {Klatte, Diethard and Lathi, Hans-Jakob and Schmedders, Karl},
series = {Operations Research Proceedings},
pages = {401-406},
note = {http://opensolver.org},
doi = {10.1007/978-3-642-29210-1_64},
isbn = {978-3-642-29209-5},
language = {English},
url = {http://dx.doi.org/10.1007/978-3-642-29210-1_64}
}

Footnote

The Excel Solver is a product developed by Frontline Systems for Microsoft. OpenSolver has no affiliation with, nor is recommend by, Microsoft or Frontline Systems. All trademark terms are the property of their respective owners.

Contents

Solver and Conventional VBA

Avoiding Solver Reference Problems

Preparing Solver for First Use

Solver Links

Solver and Conventional VBA

Solver is a powerful analysis tool, bundled with Excel and used for optimization and simulation of business and engineering models. It can be even more powerful if used in conjunction with VBA, to automate solving of multiple models which use different input parameters and constraints.

In a simple example, there are two factors in B5 and B6. The product (=B5*B6) is calculated in B8. Solver will be used to find the maximum value of the target cell (the product in B8), subject to the constraint that both factors (B5:B6) shall not exceed a value of 4. Select Solver from the Tools menu, and enter the appropriate conditions and constraints in the Solver Parameters dialog.

Click the Solve button, and another dialog indicates whether a solution is found and offers some options.

If you record a macro while you use Solver, you will get something like the following:

SolverAdd adds constraints to the Solver model. SolverOK defines the cell to optimize, how to optimize it, and what cells to change during the Solver optimization. The macro recorder wrote this line twice, so the first occurrence can be removed. To prevent parameters from a different Solver optimization interfering with the macro's optimization, Solver should be reset prior to running, using SolverReset. SolverSolve has an optional UserFinish argument; if UserFinish is False or omitted, the second dialog shown above will ask the user whether to save the optimization, but if UserFinish is True, Solver will end without the dialog. A modified Solver macro is shown below:

When you try to run this macro, you get a compile error. The command SolverReset is highlighted, and the following error message appears.

In order to use a macro based on an installed add-in, you must first make sure that the add-in is installed, then you must set a reference to the add-in in the workbook containing the code that calls the add-in's procedures.

To install an add-in, on Excel's Tools menu, choose Add-Ins. If the add-in is shown on the list, check the box in front of its name. If the add-in is not found, click Browse, navigate to the add-in file*, then when it appears on the add-in list, check its checkbox. Solver was already installed, or we would not have been able to record a macro using it.

*Depending on your Office and Windows versions, the default Excel add-ins library is 'C:Program FilesMicrosoft OfficeOFFICE15Library' or 'C:Documents and Settings{username}Application DataMicrosoftAddIns'. By default in Excel 2013, Solver is located in 'C:Program FilesMicrosoft OfficeOFFICE15LibrarySOLVER'.

To set a reference to an add-in, it must first be installed. Then on the VB Editor's Tools menu, select References. This lists all open workbooks and installed add-ins, as well as a huge list of resources installed on the host computer. Find the add-in in the list, and check the box in front of its name.

Avoiding Solver Reference Problems

The code you write to run Solver will work on your computer, and on any computer with the same versions of Excel and Solver. In fact, it should work on any computer that has later versions of Excel and Solver. If you want to distribute your workbook with VBA code written for Solver, you should write the code using the earliest expected version of Excel, so it will work on all versions that users may have installed. When the workbook is first opened on a given computer, it finds the references resources, or more recent versions if available.

This sounds easy, but sometimes it isn't. Perhaps you developed a workbook in Excel 2013 for your department to use, but you have to send it to a supplier, and the supplier hasn't upgraded past Excel 2007. Or perhaps the workbook must be shared amongst a group of users who have different versions of Excel and Solver installed. In these cases, a computer with an earlier version of Solver installed will choke on the reference to a later version of Solver.

It is possible, of course, to install add-ins and set references using VBA. This can be tricky, the user has to grant permission for VBA code to access any VB projects. Without this permission, references to installed components cannot be set.

To avoid issues with installing add-ins and setting references to various resources, your code can be modified so that it is called using Application.Run. Without a reference to the add-in, you lose IntelliSense and the Object Browser, and your code suffers from a small (probably imperceptible) performance penalty. However, you gain simpler, more reliable execution. The syntax is straightforward: Application.Run is followed by the procedure name in double quotes, followed by a comma separated list of arguments being passed to the procedure:

If Application.Run is used to return the calculated result of a function, the syntax is slightly different, with a variable set equal to Application.Run, with the procedure and arguments enclosed within parentheses:

The SolverMacro2 procedure above is easily modified to use Application.Run:

Star trek borg game download. A more general version of a Solver procedure is shown below. This includes more informative comments, and it provides a notice to the user about the success of the Solver optimization. Note that before Excel 2007, the name of the solver add-in was 'Solver.xla', not 'Solver.xlam'.

The results of the SolverSolve function include:

Preparing Solver for First Use

One frequent complaint about automating Solver is that it doesn't work using VBA until it has been used at least once manually. This is because Solver installs itself in a kind of 'on demand' mode. Unlike a regularly-installed add-in, it is not opened until it is first used. And until it is first used, it hasn't run its Auto_Open procedure, which is what actually prepares it to run. Using VBA you can bypass the initial manual Solver operation with this command:

This command should be run before the first Solver optimization procedure is executed. I have developed a Solver initialization routine that first makes sure the computer even has Solver, then it installs it and runs its Auto_Open procedure. The procedure is written as a function, which returns True if Solver is available and ready to use. I usually call this procedure from the parent workbook's Workbook_Open event procedure. If CheckSolver is False, I usually have the workbook close itself after a brief warning to the user.

The function above works fine for English versions of Excel, but in other languages, the name of the add-in may not be 'Solver Add-In'. We have to be a bit more clever, and introduce a loop to check the filenames of all add-ins. The CheckSolverIntl function below calls two additional functions which perform the loops. This function still relies on Solver being named 'solver.xlam'. If this is not the case, for example, in different language versions of Excel, change the value of the constant sAddIn in this procedure, and please email me about it.

Solver Links

Frontline Systems
Frontline Systems has developed Solver add-ins for Excel and other applications. The standard Excel Solver add-in can be upgraded to a premium Solver version or to other specialized Solvers, and there are versions for use with other programming platforms. While the capabilities of Solver are very extensive, the online documentation is somewhat sparse.

Microsoft

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