[Coin-discuss] OsiXpr

[Jesper Hansen]

We are trying the new version of OsiXpr, but we have some
problems that we would ask you about. The first is that even though we
set the variables to be integer and run with branchAndBound we still get
continues variables from the optimizer.

Well, to illustrate it I just wanted to create a small test problem and
started out with the LP examples in the COIN tutorial from Lehigh. There 
is a few extra lines where the variables are set to integers and 
branchAndBound is called. The solution returned is 2,0,0.25 instead of 
2,0,1, which is the integer solution. From the attached output it seems 
that Xpress finds the correct solution, but that a different solution is 
retreived from Osi.

Any help is highly appreciated. Thanks.

Jesper

-- 
Jesper Hansen, Ph.D.,
Senior Consultant             Phone: +45 33 17 91 92
Carmen Consulting             Fax:   +45 33 32 91 94
Kobmagergade 53, 3.           Cell:  +45 25 21 25 87
DK-1150 Copenhagen K          jesper at carmenconsulting.com
Denmark                       www.carmenconsulting.com





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