cartesian_to_polar

lstchain.reco.utils.cartesian_to_polar(x, y)

Cartesian to polar transformation As a convention, angle is always included in [-pi/2:pi/2]. When the angle should be in [pi/2:3*pi/2], angle = -1

Parameters:

x: float or `numpy.ndarray`

y: float or `numpy.ndarray`

Returns:

norm, angle, sign