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1 | // Copyright John Maddock 2007. |
2 | // Copyright Paul A. Bristow 2010 | |
3 | ||
4 | // Use, modification and distribution are subject to the | |
5 | // Boost Software License, Version 1.0. (See accompanying file | |
6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | // Note that this file contains quickbook mark-up as well as code | |
9 | // and comments, don't change any of the special comment mark-ups! | |
10 | ||
11 | #include <iostream> | |
12 | using std::cout; using std::endl; | |
13 | ||
14 | //[policy_ref_snip9 | |
15 | ||
16 | #include <boost/math/special_functions/gamma.hpp> | |
17 | using boost::math::tgamma; | |
18 | using boost::math::policies::policy; | |
19 | using boost::math::policies::digits10; | |
20 | ||
21 | typedef policy<digits10<5> > my_pol_5; // Define a new, non-default, policy | |
22 | // to calculate tgamma to accuracy of approximately 5 decimal digits. | |
23 | //] | |
24 | ||
25 | int main() | |
26 | { | |
27 | cout.precision(5); // To only show 5 (hopefully) accurate decimal digits. | |
28 | double t = tgamma(12, my_pol_5()); // Apply the 5 decimal digits accuracy policy to use of tgamma. | |
29 | cout << "tgamma(12, my_pol_5() = " << t << endl; | |
30 | } | |
31 | ||
32 | /* | |
33 | ||
34 | Output: | |
35 | tgamma(12, my_pol_5() = 3.9917e+007 | |
36 | */ |