Thx for the answers guys. They helped a lot. And yes, there is an error. o should be > 0 but for some reason if I change that, GLPK says "strict bound not allowed"? o is in the range 1..3 C is expected to be in 1..10 plus/minus S could be as large as 200K-300K
Best regards, Kasper On Thu, Oct 20, 2011 at 1:09 AM, Michael Hennebry < [email protected]> wrote: > On Wed, 19 Oct 2011, Kasper Tordrup wrote: > > s.t. phase{u in U, j in 1..3}: sum{s in S} ((ps[s] * y[s,j,u]) / o[s,u]) = >> d[j,u]; >> >> But since division with o[s,u] is not linear I can't do that. >> So can anyone explain how one could make the constraint linear? >> >> set S; >> set U; >> param ps {s in S}, integer, > 0; >> var y {s in S, j in 1..3, u in U}, binary; >> var o {s in S, u in U}, integer, >= 0; >> var d {j in 1..3, u in U}, integer, >= 0; >> > > It took me a while to analyze Xypron's solution. > It works if you make the change: > > s.t. c{u in U, j in 1..3, s in S}: sum{o in O} y[s,j,u,o] <= 1; > The original y[s,j,u] is allowed to be zero. > > -- > Michael [email protected] > "Pessimist: The glass is half empty. > Optimist: The glass is half full. > Engineer: The glass is twice as big as it needs to be." > -- *Kasper Tordrup - Stud. M. Sc. IMADA @ University of Southern Denmark [email protected] - +45 27 44 58 49*
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