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Fix for scipy issue 17146 (#847)

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See: https://github.com/scipy/scipy/issues/17146
This commit is contained in:
Matt Borland
2022-10-17 17:54:46 -07:00
committed by GitHub
parent dfdb50caca
commit 53534c5505
3 changed files with 29 additions and 5 deletions
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5
include/boost/math/distributions/binomial.hpp
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@@ -483,11 +483,6 @@ namespace boost
{ {
return 1; // Probability = 1 = certainty. return 1; // Probability = 1 = certainty.
} }
if (k == 0)
{ // binomial coeffic (n 0) = 1,
// n ^ 0 = 1
return pow(1 - dist.success_fraction(), n);
}
if (k == n) if (k == n)
{ // binomial coeffic (n n) = 1, { // binomial coeffic (n n) = 1,
// n ^ 0 = 1 // n ^ 0 = 1

1
test/Jamfile.v2
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@@ -892,6 +892,7 @@ test-suite distribution_tests :
[ compile test_dist_deduction_guides.cpp : [ requires cpp_deduction_guides cpp_variadic_templates ] ] [ compile test_dist_deduction_guides.cpp : [ requires cpp_deduction_guides cpp_variadic_templates ] ]
[ run git_issue_800.cpp ../../test/build//boost_unit_test_framework ] [ run git_issue_800.cpp ../../test/build//boost_unit_test_framework ]
[ run git_issue_845.cpp ../../test/build//boost_unit_test_framework ] [ run git_issue_845.cpp ../../test/build//boost_unit_test_framework ]
[ run scipy_issue_17146.cpp ../../test/build//boost_unit_test_framework ]
; ;
test-suite mp : test-suite mp :

28
test/scipy_issue_17146.cpp Normal file
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@@ -0,0 +1,28 @@
// Copyright Matt Borland, 2022
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
#include <array>
#include <numeric>
#include <boost/math/distributions/binomial.hpp>
#include "math_unit_test.hpp"
int main()
{
constexpr double n {1541096362225563.0};
constexpr double p {1.0477878413173978e-18};
const auto binom_dist = boost::math::binomial_distribution<double>(n, p);
std::array<double, 3> vals {};
for (size_t i = 0; i < 2; ++i)
{
vals[i] = boost::math::pdf(binom_dist, i);
}
CHECK_ULP_CLOSE(vals[0], 0.9983865609638467, 10);
CHECK_LE(std::accumulate(vals.begin(), vals.end(), 0.0), 1.0);
return boost::math::test::report_errors();
}