URL:
<http://savannah.gnu.org/bugs/?42042>
Summary: nan bug in bessel_Jnu
Project: GNU Scientific Library
Submitted by: psa
Submitted on: Thu 03 Apr 2014 09:36:21 PM GMT
Category: Runtime error
Severity: 3 - Normal
Operating System:
Status: None
Assigned to: None
Open/Closed: Open
Release:
Discussion Lock: Any
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Details:
Hello everyone,
I have this particular problem where I need
gsl_sf_bessel_Jnu(0.5, 3/2 * pi)
and I tested it with the following code:
#include <stdio.h>
#include <math.h>
#include <gsl/gsl_sf_bessel.h>
int
main (void)
{
double y1 = gsl_sf_bessel_Jnu(0.5, 3.0/2.0 * M_PI+1e-15);
double y2 = gsl_sf_bessel_Jnu(0.5, 3.0/2.0 * M_PI);
printf ("%e vs. %e\n", y1, y2);
return 0;
}
Output:
-3.675526e-01 vs. nan
MATLAB e.g. does return the correct value for 3/2 * pi. Is this a bug in
the implementation of the function? It seems so and I have not found
documentation about irregularities at 3/2 PI.
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