How can I condition a constraint on the value of an array?

Question

I have this condition and I would like to know how can I condition it to be created only when S = constant, otherwise it is not created. I want it to be within the range 1:B. This is the constraint:

@constraint(model, pf[j=1:B], 
            sum(P[j]*A[i] * y[i,j] * f[j] for i in 1:GX)) >= f[j] * L[j] * phi

and I wanted to condition to something like S != 'constant' where constant can be a customizable value. For example, if S = 0.01 the constraint is created, otherwise it's not. Does anyone know how I can do this?

Answer 1

You can use regular Julia control flow:

if S == 0.01
    @constraint(
        model,
        pf[j=1:B], 
        sum(P[j]*A[i] * y[i,j] * f[j] for i in 1:GX) >= f[j] * L[j] * phi,
    )
end

If this doesn't answer the question, please post it on the JuMP community forum https://jump.dev/forum and provide some more information.