`numpy.matrixlib.defmatrix:matrix.all`

Signature

def all(self, axis = None, out = None)

Test whether all matrix elements along a given axis evaluate to True.

This is the same as ndarray.all, but it returns a matrix object.

x = np.matrix(np.arange(12).reshape((3,4))); x
y = x[0]; y
(x == y)

✓

matrix([[ True,  True,  True,  True],
        [False, False, False, False],
        [False, False, False, False]])

(x == y).all()

✗

np.False_

(x == y).all(0)
(x == y).all(1)

✓

matrix([[ True],
        [False],
        [False]])