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发表于 2005-6-20 03:18:43
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<>我用lingo作了一下</P>
<>model:<BR>sets:<BR>life/lv1..lv3/:demand;<BR>factory/ft1,ft2/:store;<BR>links(factory,life):distance,cost;<BR>endsets<BR>data:<BR>distance=10 5 6<BR> 4 8 15;<BR>store=60 100;<BR>demand=45 75 40;<BR>enddata<BR>min=@sum(links:cost*distance);<BR>@for(life(I):<BR> @sum(factory(J):cost(J,I))=demand(I));<BR>@for(factory(I):<BR> @sum(life(J):cost(I,J))>=store(I));<BR>end</P>
<>结果如下</P>
<P>COST( FT1, LV1) 0.000000 9.000000<BR> COST( FT1, LV2) 20.00000 0.000000<BR> COST( FT1, LV3) 40.00000 0.000000<BR> COST( FT2, LV1) 45.00000 0.000000<BR> COST( FT2, LV2) 55.00000 0.000000<BR> COST( FT2, LV3) 0.000000 6.000000</P> |
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