Can variable index on tuple set ?

[qtbhappy]

Hi. I wonder if we can define variable indexing on tuple set? Like the following: tuple set Arc = {<1,1>,<1,2>, <1,3>, <2,3>};

float+ var x[a in Arc]; //variable on tuple set Arc

[h-g-s]

this would be: from mip import *

m = Model() Arcs = [(1, 1), (1, 2), (1, 3)]

create vars

x = {a: m.add_var() for a in Arcs}

constraint to select one arc

m += xsum(x[a] for a in Arcs) == 1