Faster inverse gamma and factorial for the WP 34S

[Paul Dale]

(02-16-2015 07:09 PM)Dieter Wrote:  I wonder what the internal digamma function might return for Ψ(1,4616321449768362) and ...363? Can you post the results with all 34 digits?

I don't think I ever tuned up the C version of the digamma routine. The series expansion there is relatively short and aimed for single precision. The XROM version uses significantly more terms (if you are in double precision).

I also don't remember why I stored the series constants as reciprocals in XROM -- probably saving a few bytes but slower.


- Pauli