URL:
<http://savannah.gnu.org/bugs/?28500>
Summary: overflow in gsl_ran_fdist_pdf
Project: GNU Scientific Library
Submitted by: bjg
Submitted on: Wed 06 Jan 2010 05:55:17 PM GMT
Category: Runtime error
Severity: 3 - Normal
Operating System:
Status: Confirmed
Assigned to: None
Open/Closed: Open
Release: 1.13
Discussion Lock: Any
_______________________________________________________
Details:
From: Gunjan Verma <[email protected]>
To: [email protected]
Subject: [Bug-gsl] possible bug in F distribution computation
function gsl_ran_fdist_pdf
Date: Tue, 5 Jan 2010 14:55:19 -0500
Dear GSL Community,
Ran into a mysterious problem.
When I run gsl_ran_fdist_pdf(.012, 8, 249) I get infinity.
But when I run
gsl_ran_fdist_pdf(.012, 8, 248) I get .000074, which is correct (checked
against MATLAB and R)
one d.f. change makes this difference - but I don't see why it should from
the formula for F pdf.
i am running a Dell Latitude E6500 machine with ubuntu 9 linux , 64 bit and
gcc 4.4.1 . I built the gsl library from source for my system.
#include <gsl/gsl_randist.h>
#include <stdio.h>
int main ()
{
double x = gsl_ran_fdist_pdf(.012,8,249);
printf("%g\n", x);
}
=>
inf
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