TypeError: unsupported operand type(s) for *: 'float' and 'tupledict'

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tao johnson

2023年05月14日 16:24

• 
• 

Hi,

I am trying to code this constraints but get an error.

Below are one fo my constraints.

Below is my code:

ramda = m.addMVar((2, 6, 6, 6), name='ramda')

for j in range(6):
        m.addConstr(ramda[:, j, 0:j, :].sum() + ramda[:, j, j + 1:, :].sum() - v[j] <= 0)

and ramda is a 4-d matrix.

Thank you for reading my post and helping me out!

0

• 

  Riley Clement

  • Gurobi Staff

  2023年05月14日 23:47

  Hi Tao,

  The error message is not being produced by the code you have pasted.  The culprit should be a line containing the * symbol, as per the error message.

  The following code, for example, runs without problem:

  m = gp.Model()
  ramda = m.addMVar((2, 6, 6, 6), name='ramda')
  v = [1]*6
  for j in range(1,5):
      m.addConstr(ramda[:, j, 0:j, :].sum() + ramda[:, j, j + 1:, :].sum() - v[j] <= 0)

  Note you will need to handle j = 0 and j = 5 separately since

  ramda[:, j, 0:0, :].sum()

  and

  ramda[:, 5, 6:, :].sum()

  will raise an error (the MVar slice contains no variables).

  - Riley

  0

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