Union of indexed sets

[Ana]

Hi AMPL Support Team,

I'm wirting to you to ask for support with writing set ot indexed sets as below:

set WARE ;
set WARE_CL {WARE};
set PLANT ;
set PLANT_CL{PLANT};
set CUSTO ;
set NODE = WARE union WARE_CL {WARE} union PLANT union PLANT_CL{PLANT} union CUSTO ;
set A1 within ((WARE cross PLANT) union (PLANT cross (PLANT union PLANT_CL{PLANT}))) ;
set A2 within ((PLANT cross CUSTO) union (CUSTO cross (CUSTO union PLANT_CL{PLANT}))) ;

I wrote as above and I got the following message:

WARE_CL {WARE} needs to be subscripted

PLANT_CL{PLANT} needs to be subscripted

Please can you help me with this. Thanks in adcance for your help.

Please receive my best regards.

[AMPL Google Group]

When you specify "set WARE_CL {WARE};" you are defining a different set WARE_CL[w] for each w in WARE. I think you are trying to write the union of WARE and all the different sets WARE_CL; that would be written like this:

WARE union (union {w in WARE} WARE_CL[w])

The situation for PLANT and PLANT_CL is the same.

--
Robert Fourer
am...@googlegroups.com

{#HS:1121585771-71733#}

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[Ana]

Good Afternoon Robert,

Many thanks for your reply and your useful help!