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[bug #58061] Dropped NaN from gsl_sf_hyperg_U_int

From: Jackson Vanover
Subject: [bug #58061] Dropped NaN from gsl_sf_hyperg_U_int
Date: Sat, 28 Mar 2020 12:42:31 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.0


                 Summary: Dropped NaN from gsl_sf_hyperg_U_int
                 Project: GNU Scientific Library
            Submitted by: jacksonvanover
            Submitted on: Sat 28 Mar 2020 04:42:29 PM UTC
                Category: Accuracy problem
                Severity: 3 - Normal
        Operating System: Ubuntu 18.04
                  Status: None
             Assigned to: None
             Open/Closed: Open
                 Release: 2.6
         Discussion Lock: Any



Using version 2.6 of GSL from ftp://ftp.gnu.org/gnu/gsl/gsl-2.6.tar.gz

OS is Ubuntu 18.04.2 LTS

Hardware is a Dell workstation with a 3.60 GHz Intel i7-4790 and 32 GB
of RAM

Compiler is gcc 7.4.0 with the -w option

When the first argument is zero and third argument is a NaN,
gsl_sf_hyperg_U_int returns 1. When the first argument is nonzero, the
error handler is invoked as would be expected.

#include <gsl/gsl_sf.h>
#include <stdio.h>
#include <gsl/gsl_math.h>

int main (void){
double out;
out = gsl_sf_hyperg_U_int(0, 1, GSL_NAN);

printf("%f\n", out);
printf("%.21e\n", out);
return 0;


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