Decision Variable

[alkhawli]

is this correct?

for j in I?

in theory it is j belongs to FS(i).

[carloalbe]

I think you are referring to this piece of code:

#Only the necessary variables are instanciated
variables = []
for i in I:
    for j in I:
        if (s[j] >= t[i] and s[j] <= t[i]+2) or (i== 0 and j!= 0 )or ( i!=0 and j == 0) : # j in forward of i
            for k in K:
                if h[i] <= l[k] and h[j] <= l[k] and q[k]>= t[i] - s[i] + t[j] - s[j]: # k is able to do both i and j
                    variables.append((i,j,k))
                        
X = m.addVars(variables, vtype=GRB.BINARY, name="x")    #route variables


df = pd.DataFrame(variables, columns = ['I', 'J', 'K'])

Here creating the variables, iterate j over the entire set I , however only under the conditions the variable is created.