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