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libs/math/example/policy_ref_snip7.cpp

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+//  Copyright John Maddock 2007.
+//  Copyright Paul A. Bristow 2010.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// Note that this file contains quickbook mark-up as well as code
+// and comments, don't change any of the special comment mark-ups!
+
+//[policy_ref_snip7
+
+#include <boost/math/distributions/negative_binomial.hpp>
+using boost::math::negative_binomial_distribution;
+
+using namespace boost::math::policies;
+
+typedef negative_binomial_distribution<
+      double, 
+      policy<discrete_quantile<integer_round_inwards> > 
+   > dist_type;
+   
+// Lower quantile rounded up:
+double x = quantile(dist_type(20, 0.3), 0.05); // 28 rounded up from 27.3898
+// Upper quantile rounded down:
+double y = quantile(complement(dist_type(20, 0.3), 0.05)); // 68 rounded down from 68.1584
+
+//] //[/policy_ref_snip7]
+
+#include <iostream>
+using std::cout; using std::endl;
+
+int main()
+{
+   cout << "using policy<discrete_quantile<integer_round_inwards> > " << endl
+   << "quantile(dist_type(20, 0.3), 0.05) = " << x << endl 
+   << "quantile(complement(dist_type(20, 0.3), 0.05)) =  " << y << endl;
+}
+
+/*
+
+Output:
+  using policy<discrete_quantile<integer_round_inwards> > 
+  quantile(dist_type(20, 0.3), 0.05) = 28
+  quantile(complement(dist_type(20, 0.3), 0.05)) =  68
+
+
+*/
+