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[bug #57979] Incorrect Result from hypot function with NaN input

From: Jackson Vanover
Subject: [bug #57979] Incorrect Result from hypot function with NaN input
Date: Mon, 9 Mar 2020 16:53:24 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:73.0) Gecko/20100101 Firefox/73.0


                 Summary: Incorrect Result from hypot function with NaN input
                 Project: GNU Scientific Library
            Submitted by: jacksonvanover
            Submitted on: Mon 09 Mar 2020 08:53:22 PM UTC
                Category: None
                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

Description: when the first argument is NaN, gsl_sf_hypot appears to return
product of its second argument with the square root of two which does
not seem to be expected behavior.

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

int main (void){
double out;
out = gsl_sf_hypot(GSL_NAN, 1.0);

printf("%f\n", out); // prints out 1.41424
return 0;


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