Difference: LoopingInAMPL (3 vs. 4)

Revision 42008-03-18 - TWikiAdminUser

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META TOPICPARENT	name="AMPLSyntax"

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> Examples coming soon!

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let {e in SET} <parameter, usually involving e> := <expression, often involving e>;

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< Consider the following possibility for the American Steel . American Steel can get a 5% discount with their transportation provider out of Chicago as long as they commit to at least 1000 tonnes along each route. This change can be easily incorporated using two “looping” let statements. let {n in NODES : (‘Chicago’, n) in ARCS} Cost[‘Chicago’, n] := 0.95 * Cost[‘Chicago’, n]; let {n in NODES : (‘Chicago’, n) in ARCS} Min[‘Chicago’, n] := max(1000, Min[‘Chicago’, n]);

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Consider the following possibility for the American Steel problems (the American Steel transshipment problem and the American Steel planning problem respectively). American Steel can get a 5\% discount with their transportation provider out of Chicago as long as they commit to at least 1000 tonnes along each route. This change can be easily incorporated using two looping let statements:

let {n in NODES : ('Chicago', n) in ARCS} Cost['Chicago', n] := 0.95 * Cost['Chicago', n];
let {n in NODES : ('Chicago', n) in ARCS} Min['Chicago', n] := max(1000, Min['Chicago', n]);

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