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[Bug-gsl] cdf_poisson_P

From: Georgios
Subject: [Bug-gsl] cdf_poisson_P
Date: Wed, 17 Oct 2012 17:51:50 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121011 Thunderbird/16.0.1

Dear GSL maintainer,

I think there is an issue with function *gsl_ran_poisson_pdf* (unsigned int k, double mu):

gsl_cdf_poisson_P(-1,5) returns 1.0000


gsl_cdf_poisson_P(1,5) returns 0.040428

The second number is fine, but the first one should be either equal to the second one, or if the sign makes a difference, it should be zero.

Best wishes,

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