A quick precision test

[Paul Dale]

(06-06-2014 01:03 AM)Claudio L. Wrote:  In my case it is not the algorithm, it's the argument. CORDIC does not converge for angles > 1 radian, so I compute that cos() as sin(PI/2-alpha).

Sounds like the algorithm. As in you need a different way to compute cos
cos(x) = sin(x + pi/2) is generally considered an okay transformation from memory. Taylor series also converge well if you range reduce the argument suitably -- aim for pi/4 or less so that the first term in the series is the most significant.


- Pauli