URL:
<https://savannah.gnu.org/bugs/?58031>
Summary: gsl_sf_bessel_Kn_scaled incorrectly evaluating limit
Project: GNU Scientific Library
Submitted by: jacksonvanover
Submitted on: Mon 23 Mar 2020 11:21:44 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 attempting to evaluate the limit approaching positive infinity,
the scaled irregular modified cylindrical Bessel function reduces to
an indeterminate form of 0 x inf but GSL just returns a zero without
complaining
#include <gsl/gsl_sf.h>
#include <stdio.h>
#include <gsl/gsl_math.h>
#include <float.h>
int main (void){
double out;
out = gsl_sf_bessel_Kn_scaled(0, GSL_POSINF);
printf("%.*f\n", DBL_DIG-1, out);
printf("%.21e\n", out);
return 0;
}
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