Using glpk callbacks you can write intermediate solutions as early as glpk discovers it. Please look to the glpk manual.
On Wed, Jul 30, 2008 at 4:58 PM, Christopher Moore <[EMAIL PROTECTED]>wrote: > Any other suggestions? The reason this is important is that glpsol has yet > to run to completion for my problem (~7 days CPU time) but I would like to > extract the best solution so far without having to start over with a new run > and a time limit. Since this behavior is (so far) typical of the problem at > hand it would be nice for future runs to have a better approach. If glpsol > appended the current best solution to a file every time a new best was > found, it would be easy to work from there. > > Suggestions appreciated. > > Thanks, > > Chris > > On Jul 23, 2008, at 4:20 PM, Ali Baharev wrote: > > Hello, >> >> I am afraid setting the objective to zero is probably not the best >> solution for Chris. He would like to have 'the current "best" >> (feasible) solution' however setting the objective to zero yields the >> first integer feasible which may not be a good solution. >> >> Probably setting a gap limit would be a better option. >> >> Good luck anyhow, >> >> Ali >> > > Hello, >>> >>> I'm using glpsol (glpk -4.29) and would like to get intermediate >>> solutions out into a file. My problem doesn't require an optimal solution, >>> just a good one, so it would be very helpful for glpsol to output the >>> current "best" (feasible) solution to a file so that I can get at it much >>> like the -i option for lp_solve does. >>> >>> Can anyone tell me how to accomplish this in glpsol? >>> >>> >>> Thanks, >>> >>> Chris >>> >> > > > > _______________________________________________ > Help-glpk mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/help-glpk > -- =============================================================== Haroldo Gambini Santos http://www.ic.uff.br/~hsantos [EMAIL PROTECTED] Instituto de Computacao - Universidade Federal Fluminense
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