Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9966: exponential_distribution returns negative zero
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-02-27 22:11:35
#9966: exponential_distribution returns negative zero
-------------------------------+---------------------------
Reporter: mazzamuto@⦠| Owner: no-maintainer
Type: Bugs | Status: new
Milestone: To Be Determined | Component: random
Version: Boost 1.48.0 | Severity: Problem
Resolution: | Keywords:
-------------------------------+---------------------------
Comment (by mazzamuto@â¦):
Thanks for your help, I understand what you say on +Inf and about the
approximation. I must say that I haven't used BOOST extensively, so there
may be some things that I'm missing. Anyways the problem in the OP did
cause a bug in a section of my code which wasn't expecting 0 from
exponential_distribution. I fixed it with an additional check.
I was referring to this documentation page
http://www.boost.org/doc/libs/1_57_0/libs/math/doc/html/math_toolkit/dist_ref/dists/exp_dist.html
where it says: The domain of the random variable is [0, +â]. Anyways I get
this output when I ask the range of the distribution. Is the interval open
or closed? Is it possibile to generate numbers in an open-open interval
with BOOST? Thanks again.
{{{
range of exponential_distribution: 0 inf
}}}
{{{#!cpp
#include <boost/version.hpp>
#include <boost/math/distributions/exponential.hpp>
#include <iostream>
using namespace std;
int main() {
cout << "Using BOOST " << BOOST_VERSION << endl;
cout << "---------------" << endl;
boost::math::exponential_distribution<double> ed(1);
pair<double, double> r = boost::math::range(ed);
cout << "range of exponential_distribution: " << r.first << " " <<
r.second << endl;
return 0;
}
}}}
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/9966#comment:6> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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