How to write MPS files after presolve using Matlab API?

[bluesbo...@gmail.com]

Hello,

 

I am trying to solve a large scale problem, which I need to analyse. I am calling AMPL via the Matlab API. How can I write MPS files or others to debug the result of the presolver using the Matlab API?

 

Thank you in advance.

Best regards,

Hakan

[Robert Fourer]

To write an MPS file directly from AMPL, use MATLAB API commands like

ampl.setOption('auxfiles','rc');
ampl.eval('write mtest;');

This writes files named test.mps, test.row, and test.col containing the problem in standard MPS format and lists of the row (constraint) and column (variable) names. You can replace 'test' in the above command with any other filename that you like.

(Users of CPLEX or Gurobi can also take advantage of their features for writing files in extended MPS and 'LP' formats.)

Bob Fourer
am...@googlegroups.com

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[bluesbo...@gmail.com]

Hello Bob,

Thank you for your response. It worked perfectly.

BR,
Hakan