GAMS: SMAX and sparsity

This is a discussion about the SMAX function in GAMS and how it behaves for sparse data.

The data structure we were facing was something like:

set

i 'cases' /case1*case100000/

j 'attribute' /j1*j25/

k 'attribute' /k1*k25/

t 'type' /typ1*typ2/

;

parameter p(i,j,k,t) 'positive numbers';

* note: for each i we have only one (j,k)