GNU Scientific Library - Bugs: bug #58031, gsl_sf_bessel_Kn_scaled...
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bug #58031: gsl_sf_bessel_Kn_scaled incorrectly evaluating limit
Submitter: | Jackson Vanover <jacksonvanover> | ||
Submitted: | 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 |
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Depends on the following items: None found
Items that depend on this one: None found
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Corresponding source code
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;
}