setAttr ( attrname, newvalue )

Set the value of a matrix constraint attribute.

Note that, due to our lazy update approach, the change won't actually take effect until you update the model (using Model.update), optimize the model (using Model.optimize), or write the model to disk (using Model.write).

The full list of available attributes can be found in the Attributes section.

Raises an AttributeError if the specified attribute doesn't exist or can't be set. Raises a GurobiError if there is a problem with the MConstr object (e.g., it was removed from the model).


attrname: The attribute being modified.

newvalue: ndarray of desired new values for the attribute. The shape must be the same as the MConstr object. Alternatively, you can pass a scalar argument, which will automatically be promoted to have the right shape.

Example usage:

  mc = model.addConstr(A @ x <= b)
  mc.setAttr("RHS", np.arange(A.shape[0]))
  mc.setAttr(GRB.Attr.RHS, 0.0)  # broadcast