Hi Dmitri, This could be done through the objective function. But before going there, I'm wondering a bit about the solution you're showing for your example. Wouldn't you want move item 7 from Bin 3 to Bin 2 to meet your primary objective?
Jeff On Sun, Jan 27, 2013 at 1:34 PM, Dmitri Goutnik <d...@syrec.org> wrote: > Hello everyone, > > I modified bpp.mod to pack items in predefined number of bins of unlimited > capacity so that weight is (approximately) evenly distributed between bins. > In addition to weight, each item has an "order" or "position". Is there a > way to write an additional model constraint so that items are preferably > packed in compact order, e.g. items with sequential positions should go to > the the same container? For example, for this solution: > > Bin 1: total weight 110 > item 1 (40) > item 4 (70) <-- > > Bin 2: total weight 90 > item 5 (50) > item 6 (40) > > Bin 3: total weight 130 > item 2 (60) --> > item 3 (30) > item 7 (15) > item 8 (25) > > is there a way to add such constraint so item 2 would preferably be packed > to bin 1? > > Thanks, > Dmitri > _______________________________________________ > Help-glpk mailing list > Help-glpk@gnu.org > https://lists.gnu.org/mailman/listinfo/help-glpk >
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