scip - Getting LP relaxation before SCIPsolve -



scip - Getting LP relaxation before SCIPsolve -

i utilize lp relaxation of problem before calling scipsolve() , know best/simplest way of doing this.

i'm creating scip_lpi populate original problem's data. thought simple way phone call scipgetlpi() (and re-create everything), when write problem file (to see it) empty problem. guess because since haven't called scipsolve() yet. tried calling scippresolve() first, problem still empty.

to lp relaxation believe have phone call scipsolve @ point. 1 way see , utilize scipsolve set parameter limits/nodes 1, phone call scipsolve, solve root node. can set limits/nodes -1 , phone call scipsolve 1 time again solve if needed. note doing give lp relaxation of presolved problem, , cuts added. depending on do, may want disable presolving , cuts.

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