Hello,
where can I find documentation regarding the "()"-brackets as in the node balancing restriction of example 5.6 (SAS/OR(R) 9.3 User's Guide: Mathematical Programming)?
con balance {i in NODES}:
sum {<(i),j> in ARCS} Flow[i,j]
- sum {<j,(i)> in ARCS} Flow[j,i]
= _sd_;
Why this is necessary is quite clear; but can't find anything on this optmodel syntax.
Thanks & kind regards
It is discussed in the "More on Index Sets" section of the PROC OPTMODEL documentation:
SAS/OR(R) 13.2 User's Guide: Mathematical Programming
See also this "Manpower Planning" example that shows three equivalent forms:
SAS/OR(R) 13.2 User's Guide: Mathematical Programming Examples
It is discussed in the "More on Index Sets" section of the PROC OPTMODEL documentation:
SAS/OR(R) 13.2 User's Guide: Mathematical Programming
See also this "Manpower Planning" example that shows three equivalent forms:
SAS/OR(R) 13.2 User's Guide: Mathematical Programming Examples
It is a shorthand for the slice operator, often used to make this very common pattern:
sum{<i,j> in FOO: i = something} x[i,j]
shorter, as in:
sum{<(something),j> in FOO} x[something,j]
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