another question I cannot overcome concerns two sets of identifiers; g and g’

I have a set g, a bunch of identical squared grids next to eachother. And I need to include another set of g, wich I call g’, which are other than g. so that biomass can be transported from g to g’, e.g. to calculate transport costs. the example is:

elements g are 1 2 3 with specific quanities transported to the other grids. I therefore need to make another set g’ which is not identical to g, as to enable transport from e.g. grid 5 to its surroundings, to grid 1, or 2, or 3,

4 5 6 4,6,7,8 or 9. how do I put that down in GAMS? maybe as: sets g / 1*9 /

7 8 9 g’ / ?? /

the actual formula is: TCb(t) =e= âˆ‘(i,l) UTCb(l) * [ âˆ‘ (g,g’) Qb(i,g,l,g’,t) * a * b ]

where a and b are parameters

where Qb(i,g,l,g’,t) is the flow rate of biomass i which needs to be transported with transport mode l between elements g and g’ in time t

another thing related to this which I don’t know how to annotate in GAMS conserns the sets to be summed, under the âˆ‘ sign. the first is (i,l), which is not âˆ‘(i)âˆ‘(l), but âˆ‘(i,l). and the second is âˆ‘(g,g’) instead of âˆ‘(g)âˆ‘(g’)

anyone got an idea? lots of thanks guys!!

kind regards from ben

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