[Coin-bcpdiscuss] Core cuts and vars
matteo.salani at epfl.ch
Wed Nov 8 11:51:17 EST 2006
Laszlo Ladanyi wrote:
> Hi Matteo,
> You seem to be doing things correctly (at least the idea is correct :-). So
> there is a bug either in BCP or in your code.
the latter with prob. 99,9%
> The assign method picks up the
> number of cols and rows (i.e., the lengths of the other arrays) from the
> CoinPackedMatrix mat. So check first that everything is correct there. If you
Ok so here's the problem!
since the core matrix of Bcp doesn't have any artificial variable for
the m constraints (i.e. no "ones" from n to n+m) the CoinPackedMatrix
will contain only indexes up to n.
if I got the point of CoinPackedMatrix is that I will store only
nonzero coefficients and indexes. So why the size of the LP should be
taken from the size of the CoinPackedMatrix which probably is not the
Btw I'll try to add m artificial core variables and it should work
unless I don't see why...
Many thanks for your quick answer!
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