Query the value of an attribute for a matrix variable. The full list of available attributes can be found in the Attributes section.
AttributeError if the requested attribute doesn't
exist or can't be queried.
GurobiError if there is a problem with the
MVar object (e.g., it was removed from the model).
The result is returned in a NumPy ndarray with the same shape as the
attrname: The attribute being queried.
Current values for the requested attribute.