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37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
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// 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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//[policy_ref_snip9
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#include <boost/math/special_functions/gamma.hpp>
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using boost::math::tgamma;
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using boost::math::policies::policy;
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using boost::math::policies::digits10;
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typedef policy<digits10<5> > my_pol_5; // Define a new, non-default, policy
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// to calculate tgamma to accuracy of approximately 5 decimal digits.
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//]
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int main()
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{
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cout.precision(5); // To only show 5 (hopefully) accurate decimal digits.
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double t = tgamma(12, my_pol_5()); // Apply the 5 decimal digits accuracy policy to use of tgamma.
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cout << "tgamma(12, my_pol_5() = " << t << endl;
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}
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/*
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Output:
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tgamma(12, my_pol_5() = 3.9917e+007
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*/
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