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74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
// Copyright John Maddock 2007.
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// Copyright Paul A. Bristow 2010
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// Note that this file contains quickbook mark-up as well as code
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// and comments, don't change any of the special comment mark-ups!
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#include <iostream>
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using std::cout; using std::endl;
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#include <cerrno> // for ::errno
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//[policy_eg_7
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#include <boost/math/distributions.hpp> // All distributions.
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// using boost::math::normal; // Would create an ambguity between
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// boost::math::normal_distribution<RealType> boost::math::normal and
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// 'anonymous-namespace'::normal'.
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namespace
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{ // anonymous or unnnamed (rather than named as in policy_eg_6.cpp).
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using namespace boost::math::policies;
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// using boost::math::policies::errno_on_error; // etc.
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typedef policy<
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// return infinity and set errno rather than throw:
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overflow_error<errno_on_error>,
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// Don't promote double -> long double internally:
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promote_double<false>,
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// Return the closest integer result for discrete quantiles:
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discrete_quantile<integer_round_nearest>
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> my_policy;
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BOOST_MATH_DECLARE_DISTRIBUTIONS(double, my_policy)
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} // close namespace my_namespace
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int main()
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{
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// Construct distribution with something we know will overflow.
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normal norm(10, 2); // using 'anonymous-namespace'::normal
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errno = 0;
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cout << "Result of quantile(norm, 0) is: "
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<< quantile(norm, 0) << endl;
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cout << "errno = " << errno << endl;
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errno = 0;
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cout << "Result of quantile(norm, 1) is: "
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<< quantile(norm, 1) << endl;
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cout << "errno = " << errno << endl;
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//
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// Now try a discrete distribution:
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binomial binom(20, 0.25);
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cout << "Result of quantile(binom, 0.05) is: "
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<< quantile(binom, 0.05) << endl;
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cout << "Result of quantile(complement(binom, 0.05)) is: "
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<< quantile(complement(binom, 0.05)) << endl;
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}
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//] //[/policy_eg_7]
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/*
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Output:
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Result of quantile(norm, 0) is: -1.#INF
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errno = 34
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Result of quantile(norm, 1) is: 1.#INF
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errno = 34
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Result of quantile(binom, 0.05) is: 1
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Result of quantile(complement(binom, 0.05)) is: 8
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*/
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