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

Answered

tao johnson

May 14, 2023 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

Comments

1 comment

Riley Clement

Gurobi Staff

May 14, 2023 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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