[WP-34S] DEG and RAD - diffs

[Dieter]

(06-06-2014 04:07 PM)Claudio L. Wrote:  Also ln() is very tricky (it's also in rotation mode), because the input to the CORDIC algorithm is (1-x) and (1+x). When x is close to one you lose a lot of digits in the first one, and when it's close to zero you lose them in the other one. Can't win.

Since we are talking about hyperbolic functions I assume you refer to artahn x = 1/2 ln[(1+x)/(1–x)]. Numerically this is not much of a problem as long as a ln1plusx function is available. This way artahn x can be written as 1/2 ln1plusx[2x/(1-x)]. Since already the 41-series offered such a function (as well as e^x–1 for that matter) there might be a way to realize this function in CORDIC as well. I am sure you will have a definitive answer here. ;-)

Dieter