[Coin-discuss] no integers in writeMps?

[Brady Hunsaker]

Thanks everyone for clarifying the issue for me.  I'll try changing 
OsiCpx to use the native Coin routine and post the fix to the list if it 
works correctly.

Brady

Ted Ralphs wrote:
> I believe the reason that OsiCpx doesn't write out integer information 
> when using its own internal routine is related to the problem discussed 
> a year or two ago with CPLEX dumping solution and integrality 
> information when switching between problem types. In order to make it 
> work well with CGL, the problem always stays loaded as an LP, even when 
> some of the variables are integer, unless the user calls 
> branchAndBound(). The integrality information is stored only in the 
> cache. Otherwise, OsiCpx cannot be used for branch and cut with the 
> current design of CGL.
> 
> Ted


-- 
Brady Hunsaker
Assistant Professor
Industrial Engineering
University of Pittsburgh
http://www.engr.pitt.edu/hunsaker/