Problem with dictionaries and arrays

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Harun Gül

2022年08月29日 15:38

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I kind of have a unique Opimization Problem therefore cant look at examples. What I want to do is to minimize cost of production with machines and tasks to be assigned. Also there are different types of machines with different costs but firstly I want to solve another problem. 
A minimum example is like followes:

stations  = [1,2]
costs     = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]

arcs = [(i,j) for i in tasks for j in stations]
c = {(i,j): costs_BTC1[j-1] for i,j in arcs}

The tasks variable I get from a Excel Sheet and it works fine. The output for tasks is like that:

['w01','w02','w03','w04','w05','w06','w07','w08','w09','w10','w11',
 'w12','w13','w14','w15','w16','w17','w18','w19','w20']

When I print c i get:

{('w01', 1): 2,
 ('w01', 2): 3,
 ('w02', 1): 2,
 ('w02', 2): 3,
 ('w03', 1): 2,
 ('w03', 2): 3,
.....}

and so on 40 times this kind of combination.

What I want is that the costs are dependent on tasks but not on stations like here. So for this example something like:

('w01', 1): 1

('w02', 1): 2

('w03', 1): 3

... and so on and the same values for station 2 because cost are not dependent on station.

How can I do this? If I try to make cost to a dictionary it says that integer or slices are expected but even like that cant reach what I want

Aprreciate your help!

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  Jaromił Najman

  • Gurobi Staff

  2022年08月30日 11:54

  Note that this is not really a Gurobi issue but rather a general Python question.

  Could you please provide a minimal reproducible example? For this, you would to at least provide the costs_BTC1 list and state what exactly you want to get.

   

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