How to take the remainder of the variables in gurobi？
AnsweredHi，I want to take the remainder of the variable.
for k in orders:
m.addConstr(t[k.no] % 7 + 1 == k.rk % 7)
t is the decision variable.
But it returns the following error
TypeError: unsupported operand type(s) for %: 'Var' and 'int'
Is there any way to solve this problem?
thanks a lot.
Yu
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Official comment
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Gurobi Staff
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Community Moderator
You could try expressing each of the affected t variables as \(t = 7*a + b\), with \(a, b\) being integers and \(b \in [0,6]\) Then, \(b\) is your reminder and you can use it in the constraint you showed.
Hope this helps.
Best regards,
Jonasz0 -
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Sorry, I didn't describe the problem I encountered clearly. I would like to solve the following problem，
Cargo k starts shipping at time
and arrives at time
. The start time is known (
represents the day of the week, Monday, Tuesday, etc.) and the arrival timeis the decision variable (determined by the chosen path,
).
I wantandto be the same, e.g. both on Monday or both on Tuesday.For example,
=1 (ship on Monday),=35 (arrive in 35 days), and 35 days is also a Monday.Best regards,
Yu
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Hi Jonasz，
I'm sorry I didn't think carefully about the method you proposed, and I did the calculation again using your method. It worked.
Thank you very much!
Yu
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One more piece of advice, Yu: You can use LaTeX directly in our Community Forum as explained here: Posting to the Community Forum
This is a lot less work than copy-pasting mathematical notation as images.
Cheers,
Matthias0 -
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Hi Matthias,
Thanks, this is very helpful to me.
Best regards,
Yu
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