[bug #58062] Dropped NaN from gsl_sf_hyperg1F1_int

[Jackson Vanover]

URL:
  <https://savannah.gnu.org/bugs/?58062>

                 Summary: Dropped NaN from gsl_sf_hyperg1F1_int
                 Project: GNU Scientific Library
            Submitted by: jacksonvanover
            Submitted on: Sat 28 Mar 2020 04:44:01 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

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Details:

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_1F1_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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