Returns the quadrant specific inverse of the tangent
Usage
atan2_spec(x, y)
atan2d_spec(x, y)
Arguments
- x, y
dividend and divisor that comprise the sum of sines and cosines,
respectively.
References
Jammalamadaka, S. Rao, and Ambar Sengupta (2001). Topics in
circular statistics. Vol. 5. world scientific.
