Faster inverse gamma and factorial for the WP 34S

[Bit]

(02-16-2015 07:09 PM)Dieter Wrote:  

(02-16-2015 05:46 PM)Bit Wrote:  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.

That's what should be expected with the internal 39-digit precision of C-coded functions. ;-)

I should've clarified that I tried the XROM code (trunk/xrom/digamma.wp34s), not the C version.

(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?

Here you go, only 21 correct digits in these cases (the omitted digits are zeros):
8.199 917 911 936 391 396 113 e-12
8.200 014 679 160 935 407 842 e-12