`numpy.matrixlib.defmatrix:matrix.argmax`

Signature

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

Indexes of the maximum values along an axis.

Return the indexes of the first occurrences of the maximum values along the specified axis. If axis is None, the index is for the flattened matrix.

This is the same as ndarray.argmax, but returns a matrix object where ndarray.argmax would return an ndarray.

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

✓

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

x.argmax()

✗

np.int64(11)

x.argmax(0)
x.argmax(1)

✓

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