Hi, I’m writing a program for a two MIP formulations with each a set of constraints. I would like to be able to compare the two in terms of computation time. Hence, I would like two set of constraints such that I can select the constraints needed for a formulation in the mathematical program. However, at the moment I have several constraints and a set as a subset of AllConstraints. Below, it shows a part of the code. I get the error: Expecting an element but the giben expression is of type reference in regards to the set Constraints1. How do I fix this? Set Constraints1 { Definition: { { charge_change, battery_max, battery_min, charging_limit, decharging_limit } } } Constraint charge_change { IndexDomain: t; Definition: e(t) = e(t-1) + Eta_c * p_charged(t) - p_decharged(t) / Eta_d; } Constraint battery_max { IndexDomain: t; Definition: e(t) <= S_max; } Constraint battery_min { IndexDomain: t; Def
