Re: [Help-glpk] glpksol default settings

[Marcin Mucha]

Thanks, I changed it and I can kind of reproduce glpsol's behaviour,
but now I pinpointed the problem to this LP:
http://www.mimuw.edu.pl/~mucha/lpQ_bad.txt

glpsol --cpxlp lpQ_bad.txt
give UNBOUNDED solution here. However, both
glpsol --std --cpxlp lpQ_bad.txt
and
glpsol --adv --cpxlp lpQ_bad.txt
which is kind of weird. Also neither lpx_adv_basis nor lpx_std_basis
seem to solve the problem from C++ API level. Could anyone please tell
me what I am missing here?

Marcin

On Tue, Jul 29, 2008 at 1:31 PM, Andrew Makhorin <address@hidden> wrote:
>> Hello, I have glpk 4.25 installed on my Ubuntu and I am having trouble
>> with solving some LPs while glpksol solves them fine. I was trying to
>> reproduce glpksol's behaviour in my C++ program but couldn't do it.
>> What options should I use with glp_simplex to get the exact same
>> behaviour as glpksol?
>
> You can enable lp presolver (see the second parameter passed to
> glp_simplex). On api level it is disabled by default.
>
>



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