Hello Andrew,
I received the error
min{} over empty set; result undefined
for the following statement.
param ti{i in O} := max( ti0[i] , min( ta0[i], min{(i,j) in V diff I }
ti0[j]) - d[i] );
Currently for operations over sets in GLPK the following definitions have
been made:
prod{i in {}} i = 1;
sum{i in {}} = 0;
because 1 and 0 are the neutral elements for the operations * and +.
It would be useful to add by definition:
max{i in {}} i = -DBL_MAX; # -infinity
min{i in {}} i = DBL_MAX; # infinity
because -infinity and infinity are the neutral elements for the operations
max and min.
This can save using "if" expressions in cases as the one above.
Best regards
Xypron
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