Pyomo无法使用索引集索引组件

Question

I have a Pyomo model that has a sparse set of values but I get the error Cannot index a component with an indexed set when I try to index a binary variable according to this sparse set. For a simplified example:

model = ConcreteModel()

model.S = Set([1, 4, 6])
model.V = Var(model.S, within=Binary)

Answer 1

The line

model.S = Set([1, 4, 6])

creates an Indexed Set: that is a Set of 3 Sets, each one of which is empty (Pyomo treats positional arguments as indexing sets - just like in your comment about Var([1,3,5], within-Binary) ). As it does not make sense to index something by a set-of-sets, you get the exception " Cannot index a component with an indexed set ".

In your case, it looks like you want a single set S that has three values. The correct syntax is:

model.S = Set(initialize=[1, 4, 6])
model.V = Var(model.S, within=Binary)