Re: GLPK/glpsol gives different objective values for mip/nomip

[Chris Matrakidis]

On Tue, 6 Oct 2020 at 16:15, Domingo Alvarez Duarte <mingodad@gmail.com> wrote:

Testing GLPK with miplib2017 I noticed that GLPK/glpsol gives different
values for LP objective funcion value when a MIP problem is given with
the option --nomip , is this the expected behavior ?

Yes, this is expected. For a mip additional preprocessing is possible, a trivial example is that integer variable bounds can be tightened to the next integer.

Best Regards,

Chris Matrakidis