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B. Solving models with glpsol

The GLPK package(7) includes the program glpsol, which is a stand-alone LP/MIP solver. This program can be launched from the command line or from the shell to solve models written in the GNU MathProg modeling language.

In order to tell the solver that the input file contains a model description, you should specify the option --model in the command line. For example:

 
glpsol --model foo.mod

Sometimes it is necessary to use the data section placed in a separate file, in which case you may use the following command:

 
glpsol --model foo.mod --data foo.dat

Note that if the model file also contains the data section, that section is ignored.

If the model description contains some display and/or print statements, by default the output sends to the terminal. In order to redirect the output to a file you may use the following command:

 
glpsol --model foo.mod --display foo.out

If you need to look at the problem which has been generated by the model translator, you may use the option --wcpxlp as follows:

 
glpsol --model foo.mod --wcpxlp foo.lp

in which case the problem data is written to file foo.lp in CPLEX LP format suitable for visual analysis.

Sometimes it is needed merely to check the model description not solving the generated problem. In this case you may specify the option --check, for example:

 
glpsol --check --model foo.mod --wcpxlp foo.lp

In order to write a numeric solution obtained by the solver you may use the following command:

 
glpsol --model foo.mod --output foo.sol

in which case the solution is written to the file foo.sol in plain text format.

Complete list of the glpsol options can be found in the reference manual included in the GLPK distribution.


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