bugGNU Scientific Library - Bugs: bug #57979, Incorrect Result from hypot...


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bug #57979: Incorrect Result from hypot function with NaN input

Submitter:  Jackson Vanover <jacksonvanover>
Submitted:  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

Mon 09 Mar 2020 08:53:22 PM UTC, original submission:  

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 the
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;

Jackson Vanover <jacksonvanover>


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