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Faster inverse gamma and factorial for the WP 34S
02-08-2015, 08:56 PM
Post: #24
RE: Faster inverse gamma and factorial for the WP 34S
(02-08-2015 07:10 PM)Dieter Wrote:  
(02-08-2015 05:39 PM)Bit Wrote:  Awesome. I can't work on this right now but I'm glad the real experts have taken on the issue.

Real experts would have included a perfect solution for arguments at or close to the Gamma minimum. ;-) There was a similar problem when Lambert's W was implemented in XROM, but back then I could provide a solution. Let's see if the community can come up with something similar here.

Test cases:
Code:
   0,88560 31944 10888 70027 88159 00582 5887
=> error

   0,88560 31944 10888 70027 88159 00582 5888
=>  1,4616 32155 73196 15209 53068 05276 6163

Otherwise it's not perfect. ;-)

Dieter

I'm curious - and I'll be up-front here, I really know little about this topic, other than the barest familiarity of gamma, inverse gamma, digamma, etc. - how is accurarcy for such values important? I am seriously not trying to minimze it; as many people are busily testing and pushing the envelope, it clearly must have some practical application, I (and I suspect other lurkers) would like to know how it applies, and why such precision can have practical use or impact.

--Bob Prosperi
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RE: Faster inverse gamma and factorial for the WP 34S - rprosperi - 02-08-2015 08:56 PM



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