Is there any possible to only use presolve in ampl and save the new model into a new nl file? or are there any tools to presolve and save a new nl model?

[Yudi, Judy WANG]

As the title:

Is there any possible to only use presolve in ampl and save the new model into a new nl file? or are there any tools to presolve and save a new nl model?

Thanks in advanced!

Sincerely,

Yudi Wang

[Robert Fourer]

The AMPL command

write btest;

will write the AMPL model -- *after* presolve -- to an nl file named test.nl. You can replace "test" with any other name you like in the write statement, and you can replace "b" with "g" to get a text version of the nl file instead of a binary version.

The "write" command only writes the nl file and does not invoke a solver.

Bob Fourer
am...@googlegroups.com

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