[Boost-bugs] [Boost C++ Libraries] #13254: extreme value distribution's mean/std fail for location=0

Subject: [Boost-bugs] [Boost C++ Libraries] #13254: extreme value distribution's mean/std fail for location=0
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-10-10 14:14:52

#13254: extreme value distribution's mean/std fail for location=0
------------------------------+--------------------------
 Reporter:  anonymous         |      Owner:  John Maddock
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  math
  Version:  Boost 1.66.0      |   Severity:  Problem
 Keywords:                    |
------------------------------+--------------------------
 Extreme value distribution's mean and standard_deviation use both
 `detail::check_scale` for location parameter a, which seems wrong, as
 there's no limitation for location parameter a (besides being finite).

 This causes even a standard extreme value distribution to fail:

 {{{
 BOOST_AUTO_TEST_CASE(checkScaleIssueMean)
 {
         boost::math::extreme_value_distribution<> G;

         boost::math::mean(G);
 }

 BOOST_AUTO_TEST_CASE(checkScaleIssueStd)
 {
         boost::math::extreme_value_distribution<> G;

         boost::math::standard_deviation(G);
 }
 }}}

 with

 {{{
 std::domain_error: Error in function boost::math::mean(const
 extreme_value_distribution<double>&): Scale parameter is 0, but must be >
 0 !

 std::domain_error: Error in function boost::math::standard_deviation(const
 extreme_value_distribution<double>&): Scale parameter is 0, but must be >
 0 !
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13254>
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