Difference: TransshipmentProblemInAMPL (5 vs. 6)

Line: 1 to 1

META TOPICPARENT	name="TransshipmentProblem"

The Transshipment Problem in AMPL

Line: 11 to 11

The net demand $\hat{d}_j, j \in {\cal N}$ 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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META FILEATTACHMENT	attachment="latex56f76e376243ad67ee1d9ef33bf47490.png" attr="h" comment="" date="1208854554" name="latex56f76e376243ad67ee1d9ef33bf47490.png" stream="GLOB(0xa748aa8)" tmpFilename="latex56f76e376243ad67ee1d9ef33bf47490.png" user="BaseUserMapping_333" version="1"

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"

>
>

META FILEATTACHMENT	attachment="transshipment.mod" attr="" comment="" date="1209349266" name="transshipment.mod" path="transshipment.mod" size="1568" stream="transshipment.mod" tmpFilename="" user="MichaelOSullivan" version="5"