Need Assistance with Time-Dependent Constraints in AMPL

[marcos]

Need Assistance with AMPL Constraint Modeling

Hi @nolanmaris , The right way of writing indexed constraints in ampl is just specifying the index (there are no forall loops involved) P_{t} \leq D_{t} + I_{t-1} - I_{t} + R_{t}, \quad \forall t \in Time subject to meet_demand {t in Time: t > 0}: prod[t] <= demand_forecast[t] + inventory[t-1] - inventory[t] + resource_availability[t]; I added the t > 1 condition so you do not get an error for t = 0 (inventory[-1]?). It depends on what is the first time value you are considering. You can u…