`numpy.matrixlib.defmatrix:matrix.mean`

Signature

def mean(self, axis = None, dtype = None, out = None)

Returns the average of the matrix elements along the given axis.

Refer to numpy.mean for full documentation.

Same as ndarray.mean except that, where that returns an ndarray, this returns a matrix object.

x = np.matrix(np.arange(12).reshape((3, 4)))
x

✓

matrix([[ 0,  1,  2,  3],
        [ 4,  5,  6,  7],
        [ 8,  9, 10, 11]])

x.mean()

✗

np.float64(5.5)

x.mean(0)

✓

matrix([[4., 5., 6., 7.]])

x.mean(1)

✗

matrix([[1.5],
        [5.5],
        [9.5]])