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[Bug-gsl] [bug #53905] Bug in Hypergeometric function

From: Patrick Alken
Subject: [Bug-gsl] [bug #53905] Bug in Hypergeometric function
Date: Mon, 14 May 2018 17:41:05 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.170 Safari/537.36


                 Summary: Bug in Hypergeometric function
                 Project: GNU Scientific Library
            Submitted by: psa
            Submitted on: Mon 14 May 2018 09:41:03 PM UTC
                Category: None
                Severity: 3 - Normal
        Operating System: 
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any



from kamran =dot= salehivaziri =at= epfl =dot= ch

Dear Sir or Madam,

Let me first thank you for your amazing package that is very well-written with
a nice documentation.

I am using your package "gsl" for c++/c to calculate Integrals of
Hypergeometric functions. I have trouble getting output for Hypergeometric
function themselves.

To be precise your code gives error for the value of "gsl_sf_hyperg_2F1(-10, 2
, 0.5 , 0.5)".

I tried to change the components a little bit and I understood that your code
works down to a=-10 but after that it gives an error. I also check from Python
and Mathematica and there is a finite value for this function(0.0778324).

Would you please respond to my e-mail since I was spending two days to debug
this and now I get to this point. ?


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