`numpy.matrixlib.defmatrix:matrix.ptp`

Signature

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

Peak-to-peak (maximum - minimum) value along the given axis.

Refer to numpy.ptp for full documentation.

Same as ndarray.ptp, except, where that would return an ndarray object, 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.ptp()

✗

np.int64(11)

x.ptp(0)
x.ptp(1)

✓

matrix([[3],
        [3],
        [3]])