Thanks for the suggestions, GVA and Michael!
Both methods worked!
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Hello everyone! The following three parameters are loaded from a GDX file, partly defined over the universal set (*). parameter1(r,i,*,t) parameter2(*,*,*,*,*,*,*) parameter3(r,*,i,*,t) Now, I want to omit some dimensions by summing over (*). However, this doesn't work with GAMS. Note that the unive...