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4 | <title>Using Boost.Math with High-Precision Floating-Point Libraries</title> | |
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26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | |
27 | <a name="math_toolkit.high_precision"></a><a class="link" href="high_precision.html" title="Using Boost.Math with High-Precision Floating-Point Libraries">Using Boost.Math with High-Precision | |
28 | Floating-Point Libraries</a> | |
29 | </h2></div></div></div> | |
30 | <div class="toc"><dl> | |
31 | <dt><span class="section"><a href="high_precision/why_high_precision.html">Why use | |
32 | a high-precision library rather than built-in floating-point types?</a></span></dt> | |
33 | <dt><span class="section"><a href="high_precision/use_multiprecision.html">Using | |
34 | Boost.Multiprecision</a></span></dt> | |
35 | <dt><span class="section"><a href="high_precision/float128.html">Using with GCC's | |
36 | __float128 datatype</a></span></dt> | |
37 | <dt><span class="section"><a href="high_precision/use_mpfr.html">Using With MPFR | |
38 | or GMP - High-Precision Floating-Point Library</a></span></dt> | |
39 | <dt><span class="section"><a href="high_precision/e_float.html">Using e_float Library</a></span></dt> | |
40 | <dt><span class="section"><a href="high_precision/use_ntl.html">Using NTL Library</a></span></dt> | |
41 | <dt><span class="section"><a href="high_precision/using_test.html">Using without | |
42 | expression templates for Boost.Test and others</a></span></dt> | |
43 | </dl></div> | |
44 | <p> | |
45 | The special functions, distributions, constants and tools in this library can | |
46 | be used with a number of high-precision libraries, including: | |
47 | </p> | |
48 | <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> | |
49 | <li class="listitem"> | |
50 | <a href="../../../../../libs/multiprecision/doc/html/index.html" target="_top">Boost.Multiprecision</a> | |
51 | </li> | |
52 | <li class="listitem"> | |
53 | <a href="http://calgo.acm.org/910.zip" target="_top">e_float (TOMS Algorithm 910)</a> | |
54 | </li> | |
55 | <li class="listitem"> | |
56 | <a href="http://www.shoup.net/ntl/" target="_top">NTL A Library for doing Number Theory</a> | |
57 | </li> | |
58 | <li class="listitem"> | |
59 | <a href="http://gmplib.org/" target="_top">GNU Multiple Precision Arithmetic Library</a> | |
60 | </li> | |
61 | <li class="listitem"> | |
62 | <a href="http://www.mpfr.org/" target="_top">GNU MPFR library</a> | |
63 | </li> | |
64 | <li class="listitem"> | |
65 | __float128 | |
66 | </li> | |
67 | </ul></div> | |
68 | <p> | |
69 | The last four have some license restrictions; only <a href="../../../../../libs/multiprecision/doc/html/index.html" target="_top">Boost.Multiprecision</a> | |
70 | when using the <code class="computeroutput"><span class="identifier">cpp_float</span></code> backend | |
71 | can provide an unrestricted <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">Boost</a> | |
72 | license. | |
73 | </p> | |
74 | <p> | |
75 | At present, the price of a free license is slightly lower speed. | |
76 | </p> | |
77 | <p> | |
78 | Of course, the main cost of higher precision is very much decreased (usually | |
79 | at least hundred-fold) computation speed, and big increases in memory use. | |
80 | </p> | |
81 | <p> | |
82 | Some libraries offer true <a href="http://en.wikipedia.org/wiki/Arbitrary-precision_arithmetic" target="_top">arbitrary-precision | |
83 | arithmetic</a> where the precision is limited only by available memory | |
84 | and compute time, but most are used at some arbitrarily-fixed precision, say | |
85 | 100 decimal digits, like <a href="../../../../../libs/multiprecision/doc/html/index.html" target="_top">Boost.Multiprecision</a> | |
86 | <code class="computeroutput"><span class="identifier">cpp_dec_float_100</span></code>. | |
87 | </p> | |
88 | <p> | |
89 | <a href="../../../../../libs/multiprecision/doc/html/index.html" target="_top">Boost.Multiprecision</a> | |
90 | can operate in both ways, but the most popular choice is likely to be about | |
91 | a hundred decimal digits, though examples of computing about a million digits | |
92 | have been demonstrated. | |
93 | </p> | |
94 | </div> | |
95 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
96 | <td align="left"></td> | |
97 | <td align="right"><div class="copyright-footer">Copyright © 2006-2010, 2012-2014 Nikhar Agrawal, | |
98 | Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert | |
99 | Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan Råde, Gautam Sewani, | |
100 | Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p> | |
101 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
102 | file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) | |
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