thank you all,it worked well,but i have another question:
i have a parameter Ec: AB BC CD DE:=
AB 0 1 1 0
BC 1 0 1 1
CD 1 1 0 1
DE 0 1 1 0;
and it means that for example nodes AB and BC are connected, and AB and CD
are also connected. Ec has a 1 value for each two nodes that are connected.
the problem is that i want to define a var x like this:
var x {u in Vc, v in Vc} binary >=0; ""if (u,v) in Ec""
and we have: Vc := AB BC CD DE;
i mean i want to have var x just for those pairs of Vc that have value 1 in
Ec, i want to define something like this:
if EC[u,v]==1 then var x {u in Vc, v in Vc} binary >=0;
but i don't know how to write if clauses.
i'd be really grateful if you could help me with this problem too.
Many thanks.
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