GAMS programming-Defining Subsets

Question

I have three sets, I and J and K, I know that for defining a subset in GAMS I should write it this way, I2(I) when set I2 is a subset of set I

The problem is that the third set, Set K, is a subset of both set I and J, and I don't know how to code that in GAMS.

Thanks in advance :)

PS Someone with enough reputation create a GAMS tag please, cause there isn't anything related to this subject in the list.

score 0 · Accepted Answer · answered Oct 29 '14 at 00:12

If I and J are disjoint you can have

set I / i1*i10 /,
    J / j1*j10 /,
    I_U_J / set.I, set.J /,
    K(I_U_J) / i1, i4, j3, j6 /;

If they are not disjoint the above code will give an error and you can, instead, do

set I_U_J / i1*i10 /,
    I(I_U_J) / i1*i7 /,
    J(I_U_J) / i3*i10/,
    K(I_U_J) / i4*i8/;

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