Difference: TransportationProblemInAMPL (5 vs. 6)

Revision 62008-04-02 - MichaelOSullivan

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 META TOPICPARENT name="AMPLGuide"

The Transportation Problem in AMPL

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>= Lower[i, j], <= Upper[i, j], integer;
>
>
Also, since some arcs no longer exist you should set a default of 0 for `Cost` (thus you don't have to define costs for non-existent arcs).
```param Cost {SUPPLY_NODES, DEMAND_NODES} default 0;
```

Balancing Transportation Problems

Balanced transportation models are preferred as there is no confusion about the relational operators for the supply and demand constraints. We can use a script file (transportation.run) to balance any transportation problem automatically:

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Changed:
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>
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