How you migrate from a modeling system depends on which modeling system you're using. With the solver-independent systems AIMMS, AMPL, GAMS and MPL migrating is extremely easy: you simply need to install a license, set the solver to Gurobi, and set your parameters, if any. You can find detailed instructions below.
With the single-solver systems OPL and Mosel you will need to migrate your existing model code. Since these are both algebraic modeling languages, this migration is straightforward. You can read more about switching from OPL on our Switching from OPL webpage. Contact us for additional details.
This page covers three topics:
If you are using AMPL, we can sell you a license or provide an evaluation copy directly. Simply contact us at email@example.com. If you are using AIMMS, GAMS or MPL, you'll want to contact them directly and ask for a Gurobi License.
Depending on the modeling language, you will use either an IDE (AIMMS and MPL) or a change a line in the model file (AMPL and GAMS).
|Modeling Language||Change Required|
|AIMMS||Select Gurobi via menu: Settings > Solver Confirguation|
|MPL||Add Gurobi via menu: Options > Solver Menu|
|AMPL||In model file, add: option solver gurobi_ampl;|
|GAMS||In program file, add either: Option LP = Gurobi; or Option MIP = Gurobi;|
The final step is to set the Gurobi parameters. Below is a table with information on where in each modeling language you can go to set the parameters. In addition, our switching from CPLEX™ and switching from XPRESS™ pages contain a detailed list of common parameters used by each of those engines, along with their corresponding Gurobi equivalent.
|Modeling Language||Action Required|
|AIMMS||First, in menu select Settings > Project Options; second, in Option Tree select Specific Solvers > Gurobi then set the parameters via the GUI.|
|MPL||First, in menu select Options > Gurobi Parameters then set the parameters via the GUI|
|AMPL||In model file, add: option gurobi_options 'presolve 2';|
|GAMS||Use command-line flags, options file or IDE|
Switching to Gurobi from within a modeling language can be done relatively quickly and with no changes required to your model. If you do run into any issues or have any questions, we are happy to assist our academic users via our Gurobi Google Group and our commercial customers and prospective users via firstname.lastname@example.org.