Solving the Model¶
Computing the solution¶
Procedures for action
Thus far, you have entered all the identifiers, their attributes and
their data. You will also need to build at least one procedure in order
to be able to instruct AIMMS to take action. In this tutorial, you will
enter two statements inside the body of the existing (empty) procedure
MainExecution: one to solve the mathematical program, and the other to
set the solution to zero when the mathematical program is not optimal.
Building a procedure
MainExecution can be completed as follows:
press the key to open the Model Explorer,
MainExecutionprocedure and open it by double-clicking ,
enter the two statements in the body attribute as illustrated in Fig. 27, or copy the below code
solve LeastCostTransportPlan; if ( LeastCostTransportPlan.ProgramStatus <> 'Optimal' ) then empty Transport, TotalTransportCost; endif;
press the Check, Commit and Close button to register the changes.
Should AIMMS report errors, simply check your input and make the necessary corrections.
Right-mouse for help
To obtain information about specific AIMMS keywords, you can use the right-mouse popup menu to open the AIMMS documentation on the appropriate page with a single click. For instance, you can obtain help on the ProgramStatus keyword as follows:
position the cursor over the ProgramStatus keyword,
right-click the mouse and select the ProgramStatus entry in the Help submenu (see Fig. 28).
Running the procedure
The procedure MainExecution is special in that there is a dedicated key,
, to execute this procedure. For all other procedures you can use the
right mouse button to select the Run Procedure command.
Watching execution progress
By pressing the
P keys simultaneously, AIMMS displays a progress
window with selected information on the progress it has made (or is
making) during an execution phase. Fig. 29 shows the progress window
you should expect to see.
Results in data pages
You have already encountered data pages while entering the elements of sets and the numeric values of parameters. Once AIMMS has computed the values of the variable Transport, these values become immediately available on the corresponding data page. Just go to this variable in the model tree, and click on it. Then use the right mouse to select the Data… command to open the data page. This will open a pivot table with Transport data.
You have computed and solved your first optimization model with AIMMS. Congrats !
You are now able to use the very basics of AIMMS software.
Continue to learn on the AIMMS Academy, and enrol to a more advanced course. This course will dig deeper in modeling using AIMMS, building a Web User Interface and communicating with an excel file or a database.
See you there ! 😁