URL:
<https://savannah.gnu.org/bugs/?57979>
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
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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
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;
}
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