[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Help-glpk] Callbacks for column generation
From: |
Andrew Makhorin |
Subject: |
Re: [Help-glpk] Callbacks for column generation |
Date: |
Thu, 10 Dec 2009 04:02:58 +0300 |
> What would happen if i add cols in a callback when the reason for
> calling the calback is GLP_IROWGEN, it would start adding columns to
> the global problem?.
Currently glpk mip solver does not allow adding columns to the
current subproblem, i.e. using column generation; glp_add_cols checks
that and raises the fatal error "operation not allowed". All columns
should be added to the mip instance before a call to glp_integer.
> Could you do something like this with CPLEX?
AFAIK, cplex also does not allow generating columns during the
mip solution process. But I can mistake, so it'd be better to ask this
qusetion on a cplex forum.