Difference: TransshipmentProblemInAMPL (5 vs. 6)

Revision 62008-04-28 - MichaelOSullivan

Line: 1 to 1

 META TOPICPARENT name="TransshipmentProblem"

The Transshipment Problem in AMPL

Line: 11 to 11
The net demand is declared as an integer parameter (note there is no >= 0):


Changed:
<
<
param NetDemand {NODES} integer;
>
>
param NetDemand {NODES} integer, default 0;

Added:
>
>
Setting the default NetDemand to be 0 means that no values need to be entered for transshipment nodes.
Note that the set NODES and the parameter NetDemand can be easily created from SUPPLY_NODES, DEMAND_NODES, Supply, etc, e.g.,:


Line: 27 to 28
param Supply {SUPPLY_NODES} >= 0, integer; param Demand {DEMAND_NODES} >= 0, integer;
Changed:
<
<
param NetDemand {n in NODES} integer
>
>
param NetDemand {n in NODES} integer, default 0
:= if n in SUPPLY_NODES then -Supply[n] else if n in DEMAND_NODES then Demand[n]; # else 0 by default
Line: 57 to 58

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Changed:
<
<
 META FILEATTACHMENT attachment="transshipment.mod" attr="" comment="" date="1209348830" name="transshipment.mod" path="transshipment.mod" size="1568" stream="transshipment.mod" tmpFilename="" user="MichaelOSullivan" version="3"
>
>
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