CONOPT Solver with Pyomo

[Philip Selby]

Is it possible to use the CONOPT solver (http://www.conopt.com/) with Pyomo?

..and can anyone provide guidance on how to do it?

Phil

[Siirola, John D]

You should be able to call the version of CONOPT distributed by AMPL simply by specifying either “--solver=conopt” at the pyomo command line or “SolverFactory(‘conopt’)” within a script.

 

This assumes that

-          you have a version of CONOPT purchased from AMPL

-          the solver is on your system’s search path

 

john

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[s.oz...@rug.nl]

Isn't it possible with the version purchased from GAMS?

[Siirola, John D]

Not that I am aware of.  We make use of the open-source ASL (AMPL Solver Library) interface for communicating with (nonlinear) solvers.  To my knowledge, the solvers that are distributed with GAMS are not built against the ASL, so would have no way to parse the “nl” model files that we generate.

 

I have had a Pyomo to GAMS writer on my list of fun things to do for over a year now, but just haven’t had the spare cycles to do it.  If anyone wants to take a stab at it, I’d be happy to work with them.

 

john

[s.oz...@rug.nl]

That's a pity, no Pyomo for me for now then...