Extract gurobi 3-dimensional variable value to a ndarray?

回答済み

scott zheng

2023年11月26日 08:24

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I have gruobio 3d-variables defined as:
self.r = self.model.addVars(self.noCells, self.noHours, self.noM, vtype=GRB.BINARY, name='Renew_Charging')

need to retrieve the optimal values after optimization.

Tried code as below, the dimension is not correct.

```
Var = np.ndarray((self.noCells, self.noHours, self.noM))
for m in range(self.noM):
    for i in range(self.noCells):
        for j in range(self.noHours):
             names_to_retrieve = f"Renew_Charging[{i},{j},{m}]"
              Var[i, j, m] = self.model.getVarByName(names_to_retrieve).X
```

関連

• Attribute

0

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  Mario Ruthmair

  • Gurobi Staff

  2023年11月27日 15:08

  Hi Scott,

  The easiest way to get the solution values and access them in the same way as the variables is via:

  values = model.getAttr("X", self.model.getVars())

  The method returns a dictionary with the same keys as the variables. This should also be much faster than using getVarByName() for each variable.

  Best regards,
  Mario

  0

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