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[Bug-gsl] [bug #45925] Incomplete Gamma Functions flipped?

From: Patrick Alken
Subject: [Bug-gsl] [bug #45925] Incomplete Gamma Functions flipped?
Date: Thu, 19 Nov 2015 22:22:06 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0

Follow-up Comment #1, bug #45925 (project gsl):

I've investigated bug #45925 "Incomplete Gamma Functions flipped?" and I
believe there is in fact no problem with gsl. The bug author compares the
(upper) incomplete gamma function with the function P(a,x) and correctly notes
that the values disagree. However the comparison should actually be done with
the function Q(a,x) rather than P(a,x), and here the values agree. The
definitions for the upper incomplete gamma function and Q(a,x) are contained
in the gsl reference document under the section on "Incomplete Gamma
Functions". I recommend that no code changes be made and that this bug be

-Bill Maier                                       


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