[Help-glpk] glp_intopt and MIP presolve

[François Galea]

Hi,

As far as I know, there are two different callable functions in GLPK, 
for MIP solving.

The former is lpx_intopt, which may be seen as a "black box" function, 
allowing to solve a whole problem, from the root LP to the integer 
optimal solution. It also features a MIP presolve functionality 
(ipp_presolve).

The latter is glp_intopt, which allows the user to set a callback 
routine which is supposed to help the branch-and-bound resolution of the 
problem.

My question is: is there a "legal" and portable way to call GLPK's MIP 
presolve when using glp_intopt ?

Could it be possible to let the user program call the presolve whenever 
needed ? (For instance, to be able check the differences between the 
original LP and the presolved LP).

Thank you,

François



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François Galea