(self)
return self.named.data.xmat[['upper_arm', 'lower_arm'], 'xz']
Returns horizontal (x) component of body frame z-axes.
Returns horizontal (x) component of body frame z-axes.
Returns horizontal ( x ) component of body frame z - axes .
def horizontal(self):
    """Returns horizontal (x) component of body frame z-axes."""
    return self.named.data.xmat[['upper_arm', 'lower_arm'], 'xz']
def horizontal ( self ) : return self . named . data . xmat [ [ 'upper_arm' , 'lower_arm' ] , 'xz' ]