Efficient approximations for the arctangent function
Sreeraman Rajan, Sichun Wang, Robert Inkol, Alain Joyal · IEEE Signal Processing Magazine · 2006
This paper provides several efficient approximations for the arctangent function using Lagrange interpolation and minimax optimization techniques. These approximations are particularly useful when processing power, memory, and power consumption are important issues. In addition to comparing the errors and the computational workload of these approximations, we also extend them to all four quadrants.