`numpy.matrixlib.defmatrix:matrix.argmin`

Signature

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

Indexes of the minimum values along an axis.

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

This is the same as ndarray.argmin, but returns a matrix object where ndarray.argmin 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.argmin()

✗

np.int64(11)

x.argmin(0)
x.argmin(1)

✓

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