How to round up in gurobi python?
進行中
I am working on a math. model and I use python to solve it.
I have 4 sets
1. Trucks=[1:263]
2. Slots=[0:23]
3. Companies=[0:3]
4. Blocks=[0:7]
And two binary decision variables X and Y
and one binary dependent decision variable Z (Z=X+Y).
I want to add the continuous-time parameters (tp+twg) to the index s (which is an integer) to make the truck access the terminal in the time slot after (tp+twg). So I have to round the value of (s+tp+twg) to the next time slot. I used the function below math.ceil() but I got an error in time slot 23. Gurobi can't calculate the value of (0,0,1,24) because the upper limit of the set S is 23. S refers to the time slot at which the truck will access the terminal in X and Y. In Z, it refers to the time slot at which the truck will arrive at the terminal gate. How can I fix that?
for i in Trucks:
for k in Companies:
for b in Blocks:
for s in Slots:
if 0 <= s < 23:
cont_9=m.addConstr(X[i,k,b, math.ceil(s+tp[s]+twg[s])]+Y[i,k,b, math.ceil(s+tp[s]+twg[s])] <= Z[i,k,b,s])
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Gurobi Staff
This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?. -
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Hi,
What values can your continuous-time parameters take? Is it possible that \(\texttt{tp[s]+twg[s]}\geq 2\) for some \(s\)? If yes, then you have to somehow limit \(s\) even further to, e.g., \(\texttt{0 <= s <= 20}\).
A different approach would be to compute the value of \(\texttt{math.ceil(s+p[s]+twg[s])}\) before adding the constraint and then adjust it appropriately such that it fits within the slot bounds.
Best regards,
Jaromił0 -
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This is a cross-post from https://stackoverflow.com/questions/63775312/how-to-round-up-in-gurobi-python
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