def dihed_angle(rs, deriv=<NUM_LIT:0>):
return _dihed_transform(rs, _dihed_angle_low, deriv)<EOL>
Compute the angle between the planes rs[0], rs[1], rs[2] and rs[1], rs[2], rs[3]

       The sign convention corresponds to the IUPAC definition of the torsion
       angle: http://dx.doi.org/10.1351/goldbook.T06406

       Arguments:
        | ``rs``  --  four numpy array with three elements
        | ``deriv``  --  the derivatives to be computed: 0, 1 or 2 [default=0]

       When derivatives are computed a tuple with a single result is returned