
From:  Joey Rios 
Subject:  RE: [Helpglpk] Solve subproblem then use sol'n in larger problem 
Date:  Sun, 10 Feb 2008 19:06:34 0800 
> To do what you want, you need to provide > an initial basis for the bigger problem. > Copy the stati of the common variables and > rows from the subproblem to the big problem. > Place the new binary variables at their upper bounds. > Make the new rows basic. > Tell GLPK to use what you have provided. > If one can, tell GLPK you have an incumbent. > If one cannot, one can tell GLPK that one has a pessimistic bound. > Invoke the simplex method. > Invoke branch and bound. Thanks so much for the response. Looking at the GLPK API, I think the magic words are going to be glp_set_col_stat()/glp_set_row_stat() based on your description. That makes sense. I think that lpx_warm_up() will then do the dirty work of setting up the basis based upon the stati I have set. I am hoping that glp_simplex()/lpx_integer() or just lpx_intopt() will be able to take over from there. If any of these thoughts seem completely wrong, hopefuly someone will correct me. When I get around to coding this within the next month or so, I may come back with more questions. Thanks for the help getting started. Climb to the top of the charts! Play the word scramble challenge with star power. Play now! 
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