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### Function with Matrix input

Hello Guys i have the following problem.

I want to write a function whose input is a Matrix. A small example:

    def Dimension(Matrix):
n = Matrix.nrows()
return n
A = ([1,0,0],[0,1,0],[0,0,1])
print Dimension(A)


but then i get :

AttributeError: 'tuple' object has no attribute 'nrows'


How can I write i function that has an Matrix as input?