How to generate .lp file?

[arm]

Hi all,

How do I tell AMPL to generate a .lp file?

Thanks,

Arm
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[Steven Harrod]

Call this instead of "solve".

write ("g/[directory path]/[filename]);

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Steven Harrod
Lexington, KY
859 225 1572

[arm]

Thank you, Steve.

Arm

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[Hans Mittelmann]

Which type of .lp file do you mean? The g or b write commands produce
a .nl file usable by AMPL itself. The CPLEX-LP or other LP formats
cannot be produced by AMPL. It does produce MPS files for MILPs with
the write m* command.

[arm]

Hi Hans,

I mean a .lp file that CPLEX can use. How MPS files differ from .lp files? I
believe CPLEX accepts .mps files, right?

Thanks,

Arm

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[Hans Mittelmann]

As I had said, the CPLEX-LP format cannot be generated but the MPS
can. It is important that you give the file the suffix .mps. For
descriptions, see http://neos.mcs.anl.gov/neos/solvers/milp:scip/MPS.html

[Hans Mittelmann]

By the way, it is very much preferable if you have the CPLEX library
to generate the cplexampl binary with the free interface at NETLIB.

[Willian Rolando Alguera López]

Hi Arm

If You´re using AMPL/CPLEX can try using the next commands :

model filename.mod;
data filename.dat;
option cplex_options "writeprob= filename.lp";
solve;

filename is your optimization model.

William Alguera

-----Mensaje original-----
De: am...@googlegroups.com [mailto:am...@googlegroups.com]En nombre de arm
Enviado el: Domingo, 10 de Junio de 2007 09:14
Para: am...@googlegroups.com
Asunto: [AMPL 1248] How to generate .lp file?

[Hans Mittelmann]

Sorry. What you suggests requires that he has already the cplexampl
binary but then he can feed the model to it directly and there is no
need to generate another file to feed it to CPLEX.

On Jun 13, 8:53 am, Willian Rolando Alguera López <w...@ut.com.sv>
wrote:

[Arm]

Thanks so much for your suggestion.

Arm

On Jun 13, 11:53 am, Willian Rolando Alguera López <w...@ut.com.sv>
wrote: