unittest/python/crocoddyl/state.py
def diff(self, x1, x2):
        r""" Operator that differentiates the two state points.

        It returns the value of x1 [-] x2 operation. Note tha x1 and x2 are
        points in the state manifold (\in M). Instead the operator result lies
        in the tangent-space of M.
        :param x1: current state
        :param x2: next state
        :return x2 [-] x1 value
        """
        raise NotImplementedError("Not implemented yet.")
r""" Operator that differentiates the two state points.

        It returns the value of x1 [-] x2 operation. Note tha x1 and x2 are
        points in the state manifold (\in M). Instead the operator result lies
        in the tangent-space of M.
        :param x1: current state
        :param x2: next state
        :return x2 [-] x1 value
        
r""" Operator that differentiates the two state points.
It returns the value of x1 [-] x2 operation. Note tha x1 and x2 are
points in the state manifold (\in M). Instead the operator result lies
in the tangent-space of M.
r " " " Operator that differentiates the two state points . It returns the value of x1 [ - ] x2 operation . Note tha x1 and x2 are points in the state manifold ( \ in M ) . Instead the operator result lies in the tangent - space of M .
def diff(self, x1, x2):
        raise NotImplementedError("Not implemented yet.")
def diff ( self , x1 , x2 ) : raise NotImplementedError ( "Not implemented yet." )
r""" Operator that differentiates the two state points.
r " " " Operator that differentiates the two state points .
r""" Operator that differentiates the two state points.

        It returns the value of x1 [-] x2 operation. Note tha x1 and x2 are
        points in the state manifold (\in M). Instead the operator result lies
        in the tangent-space of M.
        :param x1: current state
        :param x2: next state
        :return x2 [-] x1 value
        """
self
x1
x2