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

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tao johnson

2023年05月14日 16:24

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• 

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!

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  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:43

  This post is more than two 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 try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  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

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