As a full-featured day trial version, for experimenting with AMPL and solvers on your optimization applications without any limitations as to problem size. To request a trial license file for this purpose, simply fill out and submit the short online form on our Request a Full Trial page except if you are a student in which case you must use the form on our AMPL for Students page instead.
Your package includes a free license that permits unrestricted use for evaluation or study, subject to limits on the size of problem that can be sent to a solver:. These limitations are applied after any presolve reductions and elimination of variables.
The following solvers some with stricter limits as shown are included in the demo packages:. Consult the Solvers We Sell page or follow the individual links above for more solver information. To get started, follow the download instructions below for Windows , Linux , or macOS.
Subject to the problem size limits given above, it supports all AMPL modeling features; it is compatible with all of the examples in the AMPL book , which is also freely downloadable.
When the time comes to try AMPL on larger problems than the demo version will permit, consider one of the following options, which are not subject to size limitations:. Your demo download can be converted to a free day trial by filling out the form on our Request a Full Trial page or for students, our AMPL for Students page.
We describe below the main characteristics and advantages of each of these alternatives, with links to further information. For the day trial, a special student-use form appears at the end of the page. You can download a free version of AMPL and all of our popular solvers. This version is limited to variables and constraints for linear problems for nonlinear problems, and fewer for certain solvers , but it offers a way to get started fast.
See our Download a Free Demo page for further instructions. Submissions through the NEOS website are particularly attractive to students, as they do not require any software installation for either AMPL or solvers on your own computer. The following configurations are available on our price lists:. Other configurations may be available; contact our sales team for details. The following sections give basic download and installation instructions for servers and clients under Microsoft Windows , Linux , and macOS.
We recommend first creating a basic installation on your chosen server, and then creating and testing your client installations. If you encounter error conditions or special situations, consult our additional documentation:. Client computers do not need to run the same operating system as the server.
Download files. Then go to the AMPL software download site and log in to your personalized download page by following the instructions that we have previously emailed to you. If you have not logged in before or forgot your password, click on Login and then click on the password reset link. Download the needed files as follows:.
Set up the server. If they do not include "optimal solution" then the solver run may have been unsuccessful; maybe you did not choose a solver such as "ilogcp" than can handle "alldiff" constraints, or maybe the problem size was too big for the solver. When the solver is unsuccessful, it may leave all of the variables at their default values of 0, and so the optimal value will appear to be 0.
If you did get an "optimal solution" message, or you are unsure about the solver message, you can get more help by posting the entire solver message to this group. My university provides me with 3 solvers: cplex, lpsolve and gurobi.
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