Faster inverse gamma and factorial for the WP 34S

[Bit]

(02-16-2015 07:07 AM)Dieter Wrote:  So an accurate digamma function still is missing. On the other hand the one or other 34s function is, hmmm... "optional". Consider the inverse of Lambert's W: a simple e^x RCLx L does the trick just as well.

The built-in digamma function that Pauli mentioned, and which isn't available by default, is more accurate. Perhaps up to 33 digits in double precision mode if I see it correctly. If you don't have a build environment but would like to play with the built-in function, I can send you some binaries that have it enabled.