[Coin-discuss] How to choose a MIP solver in GLPK OSI?

[Stefan Vigerske]

Hi,

> 	If you want to tweak the code in a manner that will be compatible with
> the intended changes, best to go to the branchAndBound() method and edit to use
> lpx_intopt() instead of lpx_integer().  Something along the following lines
> should do it:
> 
> #ifdef GLPK_HAS_INTOPT
> 		int err = lpx_intopt( model );
> #else
> 		// Must have an LP solution before running lpx_integer
> 		if (lpx_get_status(model) != LPX_OPT)
> 			initialSolve();
> 		// What if there's an error there?
> 		int err = lpx_integer( model );
> #endif

For the moment, you will need to define GLPK_HAS_INTOPT by yourself (if 
you use a recent enough GLPK). Later, the build system will check for 
lpx_intopt and define GLPK_HAS_INTOPT accordingly.

Stefan

-- 
Stefan Vigerske
Humboldt University Berlin, Numerical Mathematics
http://www.math.hu-berlin.de/~stefan