Constraint with a set defined in a set

[Erry Olden]

Hi,

I cannot write correctly the following expression:

s.t. Max_Raw_Inv {t in TIME: t>lt[r]}:

      sum{r in RAWMAT} lotSize[r]*Order[r,t-lt[r]] <= invRawCap;

the problem is that the "t in time" must start after a value define by "lt[r]" and lt is defined in RAWMAT.

If I write the expression as above it doesn't work, because i get the error that r is not defined, if I add "r in RAWMAT" before the "t in TIME" it doesn't work anyway.

Can you help me finding the correct formulation?

Thank you.

Luca

[AMPL Google Group]

You can move the condition inside the sum as follows:

s.t. Max_Raw_Inv {t in TIME}:

sum{r in RAWMAT: t>lt[r]} lotSize[r]*Order[r,t-lt[r]] <= invRawCap;




--
Paras Tiwari
am...@googlegroups.com

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