Date: Thu, 25 Feb 2010 16:14:22 -0800 (PST) From: "Steven G. Kargl" <kargl@troutmask.apl.washington.edu> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/144306: Nasty bug in jn(3) Message-ID: <201002260014.o1Q0EMer028397@troutmask.apl.washington.edu> Resent-Message-ID: <201002260020.o1Q0K4F4036898@freefall.freebsd.org>
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>Number: 144306
>Category: bin
>Synopsis: Nasty bug in jn(3)
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Feb 26 00:20:04 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Steven G. Kargl
>Release: FreeBSD 9.0-CURRENT amd64
>Organization:
APL/UW
>Environment:
System: FreeBSD troutmask.apl.washington.edu 9.0-CURRENT FreeBSD 9.0-CURRENT #0 r204219M: Mon Feb 22 12:41:49 PST 2010 kargl@troutmask.apl.washington.edu:/usr/obj/usr/src/sys/SPEW amd64
>Description:
troutmask:kargl[466] cat testjn.c
#include <stdio.h>
#include <math.h>
int
main(void)
{
double z;
int n;
z = 2.4048255576957729;
for (n = 2; n < 10; n++)
printf("%d %e\n", n, jn(n,z));
return (0);
}
troutmask:kargl[467] cc -o z testjn.c -lm
troutmask:kargl[468] ./z
2 4.317548e-01
3 -inf
4 4.069027e-02
5 -inf
6 3.247664e-03
7 -inf
8 7.495602e-05
9 -inf
The value of a integer order Bessel function with
argument z = 2.4048255576957729 is never -inf.
>How-To-Repeat:
See above
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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