[Coin-lpsolver] OsiClpSolverInterface: writing out problems with quadratic objectives

[Kish Shen]

Hi Francois,

Thanks for your reply. [I guess I probably should have posted this to the Coin-discuss mailing list
rather than here, but since I have started here...]

I think the original LP format is from CPLEX -- does it make sense to support at least the CPLEX
convention? 

As far as I can tell, the MPS file written using writeMpsNative() also does not write out the
quadratic terms in the objective. When I write the problem in mps format using CPLEX,  
there is a QMATRIX section, which is missing from the one written by CLP (which I assume uses
CoinMpsIO) -- is this a CPLEX extension to the MPS format? Is it possible to read/write MPS
format with quadratic objective?


On Thursday 29 March 2007 17:19, fmargot at andrew.cmu.edu wrote:
> 
> Kish:
> 
> There is no support for quadratic LP in CoinLpIO. One difficulty is that
> the format is not well defined, with different solvers having different
> conventions.
> 
> Francois
> 
>