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Re: [Bug-gsl] cdf_poisson_P

From: Rhys Ulerich
Subject: Re: [Bug-gsl] cdf_poisson_P
Date: Thu, 18 Oct 2012 08:31:57 -0500

Hi Georgios,

> Just to clarify: the function I am talking about is gsl_cdf_poisson_P, Not
> gsl_ran_poisson_pdf that I mistakenly mentioned below. The function
> gsl_ran_poisson_pdf (unsigned int k, double mu) is fine, and
> gsl_ran_poisson_pdf(-1,5) returns the expected zero.

According to
gsl_cdf_poisson_P also takes an unsigned int as the first argument.
Passing negative values to the function is impossible because the
first argument is unsigned.

That "gsl_ran_poisson_pdf(-1,5) returns the expected zero" is mere
happenstance.  Somehow feeding the function "(unsigned) -1" ==
4294967295 (according to my current system) is producing the zero.

- Rhys

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