[Coin-symphony] How to get quickly a solution ?

[Renaud Lepere]

Hello,

I added the line, it helped a lot i get good feasible solutions
very quickly (i see them on the trace), but i still have problem
for stopping the algorithm quickly. The program calls the
solve function and the the process_chain and then fathom_branch
function but the fathom_branch call is long and time is checked 
in the solve function (tm->par.time_limit).
What is fathom_branch, should i replace while (TRUE) { .. 
by a while (we_still_have_some_time_left) { .. in this function ?

Thanks a lot for your help

Renaud



> -----Message d'origine-----
> De : Ted Ralphs [mailto:tkralphs at Lehigh.EDU]
> Envoyé : mardi 8 mars 2005 20:39
> À : Renaud Lepere
> Cc : coin-symphony at list.coin-or.org
> Objet : Re: [Coin-symphony] How to get quickly a solution ?
> 
> 
> Renaud,
> 
> SYMPHONY has two built-in primal heuristics (shamelessly stolen from 
> Cbc), one of which is a rounding heuristic, but they are currently 
> turned off by default. To turn them on, set the parameter 
> "do_primal_heuristic" to 1. Just put the line
> 
> sym_set_int_param(env, "do_primal_heuristic", 1):
> 
> in your code before the call to sym_solve(). I can't promise it will 
> work miracles, but hopefully, it will help!
> 
> Cheers.
> 
> Ted
> -- 
> Dr. Ted Ralphs
> Assistant Professor
> Industrial and Systems Engineering
> Lehigh University
> (610)758-4784
> tkralphs at lehigh.edu
> www.lehigh.edu/~tkr2
>