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Faster inverse gamma and factorial for the WP 34S
02-08-2015, 01:51 AM
Post: #16
RE: Faster inverse gamma and factorial for the WP 34S
(02-07-2015 07:34 PM)Dieter Wrote:  The standard lib that comes with the 34s firmware contains a digamma routine - so why not use the obvious and setup a simple Newton solver for Γ-1(a):

x := x + (a/Γ(x) – 1) / Ψ(x)

That's a good idea, thank you. When I have the time, I'll see if this method is any faster if used with the built-in digamma routine (which is a compile time option, not available by default).
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RE: Faster inverse gamma and factorial for the WP 34S - Bit - 02-08-2015 01:51 AM



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