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|  | <html> | ||
|  | <head> | ||
|  | <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> | ||
|  | <title>Riemann Zeta Function</title> | ||
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|  | <a accesskey="p" href="../zetas.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../zetas.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../expint.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> | ||
|  | </div> | ||
|  | <div class="section"> | ||
|  | <div class="titlepage"><div><div><h3 class="title"> | ||
|  | <a name="math_toolkit.zetas.zeta"></a><a class="link" href="zeta.html" title="Riemann Zeta Function">Riemann Zeta Function</a> | ||
|  | </h3></div></div></div> | ||
|  | <h5> | ||
|  | <a name="math_toolkit.zetas.zeta.h0"></a> | ||
|  |         <span class="phrase"><a name="math_toolkit.zetas.zeta.synopsis"></a></span><a class="link" href="zeta.html#math_toolkit.zetas.zeta.synopsis">Synopsis</a> | ||
|  |       </h5> | ||
|  | <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">math</span><span class="special">/</span><span class="identifier">special_functions</span><span class="special">/</span><span class="identifier">zeta</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | ||
|  | </pre> | ||
|  | <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">math</span><span class="special">{</span> | ||
|  | 
 | ||
|  | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> | ||
|  | <a class="link" href="../result_type.html" title="Calculation of the Type of the Result"><span class="emphasis"><em>calculated-result-type</em></span></a> <span class="identifier">zeta</span><span class="special">(</span><span class="identifier">T</span> <span class="identifier">z</span><span class="special">);</span> | ||
|  | 
 | ||
|  | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="../../policy.html" title="Chapter 15. Policies: Controlling Precision, Error Handling etc">Policy</a><span class="special">></span> | ||
|  | <a class="link" href="../result_type.html" title="Calculation of the Type of the Result"><span class="emphasis"><em>calculated-result-type</em></span></a> <span class="identifier">zeta</span><span class="special">(</span><span class="identifier">T</span> <span class="identifier">z</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="../../policy.html" title="Chapter 15. Policies: Controlling Precision, Error Handling etc">Policy</a><span class="special">&);</span> | ||
|  | 
 | ||
|  | <span class="special">}}</span> <span class="comment">// namespaces</span> | ||
|  | </pre> | ||
|  | <p> | ||
|  |         The return type of these functions is computed using the <a class="link" href="../result_type.html" title="Calculation of the Type of the Result"><span class="emphasis"><em>result | ||
|  |         type calculation rules</em></span></a>: the return type is <code class="computeroutput"><span class="keyword">double</span></code> if T is an integer type, and T otherwise. | ||
|  |       </p> | ||
|  | <p> | ||
|  |         The final <a class="link" href="../../policy.html" title="Chapter 15. Policies: Controlling Precision, Error Handling etc">Policy</a> argument is optional and can | ||
|  |         be used to control the behaviour of the function: how it handles errors, | ||
|  |         what level of precision to use etc. Refer to the <a class="link" href="../../policy.html" title="Chapter 15. Policies: Controlling Precision, Error Handling etc">policy | ||
|  |         documentation for more details</a>. | ||
|  |       </p> | ||
|  | <h5> | ||
|  | <a name="math_toolkit.zetas.zeta.h1"></a> | ||
|  |         <span class="phrase"><a name="math_toolkit.zetas.zeta.description"></a></span><a class="link" href="zeta.html#math_toolkit.zetas.zeta.description">Description</a> | ||
|  |       </h5> | ||
|  | <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> | ||
|  | <a class="link" href="../result_type.html" title="Calculation of the Type of the Result"><span class="emphasis"><em>calculated-result-type</em></span></a> <span class="identifier">zeta</span><span class="special">(</span><span class="identifier">T</span> <span class="identifier">z</span><span class="special">);</span> | ||
|  | 
 | ||
|  | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <a class="link" href="../../policy.html" title="Chapter 15. Policies: Controlling Precision, Error Handling etc">Policy</a><span class="special">></span> | ||
|  | <a class="link" href="../result_type.html" title="Calculation of the Type of the Result"><span class="emphasis"><em>calculated-result-type</em></span></a> <span class="identifier">zeta</span><span class="special">(</span><span class="identifier">T</span> <span class="identifier">z</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="../../policy.html" title="Chapter 15. Policies: Controlling Precision, Error Handling etc">Policy</a><span class="special">&);</span> | ||
|  | </pre> | ||
|  | <p> | ||
|  |         Returns the <a href="http://mathworld.wolfram.com/RiemannZetaFunction.html" target="_top">zeta | ||
|  |         function</a> of z: | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../equations/zeta1.svg"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../graphs/zeta1.svg" align="middle"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../graphs/zeta2.svg" align="middle"></span> | ||
|  |       </p> | ||
|  | <h5> | ||
|  | <a name="math_toolkit.zetas.zeta.h2"></a> | ||
|  |         <span class="phrase"><a name="math_toolkit.zetas.zeta.accuracy"></a></span><a class="link" href="zeta.html#math_toolkit.zetas.zeta.accuracy">Accuracy</a> | ||
|  |       </h5> | ||
|  | <p> | ||
|  |         The following table shows the peak errors (in units of epsilon) found on | ||
|  |         various platforms with various floating point types, along with comparisons | ||
|  |         to the <a href="http://www.gnu.org/software/gsl/" target="_top">GSL-1.9</a> and | ||
|  |         <a href="http://www.netlib.org/cephes/" target="_top">Cephes</a> libraries. Unless | ||
|  |         otherwise specified any floating point type that is narrower than the one | ||
|  |         shown will have <a class="link" href="../relative_error.html#math_toolkit.relative_error.zero_error">effectively | ||
|  |         zero error</a>. | ||
|  |       </p> | ||
|  | <div class="table"> | ||
|  | <a name="math_toolkit.zetas.zeta.table_zeta"></a><p class="title"><b>Table 6.73. Error rates for zeta</b></p> | ||
|  | <div class="table-contents"><table class="table" summary="Error rates for zeta"> | ||
|  | <colgroup> | ||
|  | <col> | ||
|  | <col> | ||
|  | <col> | ||
|  | <col> | ||
|  | <col> | ||
|  | </colgroup> | ||
|  | <thead><tr> | ||
|  | <th> | ||
|  |               </th> | ||
|  | <th> | ||
|  |                 <p> | ||
|  |                   Microsoft Visual C++ version 12.0<br> Win32<br> double | ||
|  |                 </p> | ||
|  |               </th> | ||
|  | <th> | ||
|  |                 <p> | ||
|  |                   GNU C++ version 5.1.0<br> linux<br> double | ||
|  |                 </p> | ||
|  |               </th> | ||
|  | <th> | ||
|  |                 <p> | ||
|  |                   GNU C++ version 5.1.0<br> linux<br> long double | ||
|  |                 </p> | ||
|  |               </th> | ||
|  | <th> | ||
|  |                 <p> | ||
|  |                   Sun compiler version 0x5130<br> Sun Solaris<br> long double | ||
|  |                 </p> | ||
|  |               </th> | ||
|  | </tr></thead> | ||
|  | <tbody> | ||
|  | <tr> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   Zeta: Random values greater than 1 | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.836ε (Mean = 0.093ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0ε (Mean = 0ε)</span><br> <br> (<span class="emphasis"><em>GSL | ||
|  |                   1.16:</em></span> Max = 8.69ε (Mean = 1.03ε))<br> (<span class="emphasis"><em>Cephes:</em></span> | ||
|  |                   <span class="red">Max = 4.49e+33ε (Mean = 6.85e+32ε) <a class="link" href="../logs_and_tables/logs.html#errors_GNU_C_version_5_1_0_linux_double_zeta_Cephes_Zeta_Random_values_greater_than_1">And | ||
|  |                   other failures.</a>)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.846ε (Mean = 0.0833ε)</span><br> | ||
|  |                   <br> (<span class="emphasis"><em><tr1/cmath>:</em></span> Max = 5.45ε (Mean | ||
|  |                   = 1ε)) | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.846ε (Mean = 0.0743ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | </tr> | ||
|  | <tr> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   Zeta: Random values less than 1 | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 7.03ε (Mean = 2.98ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0ε (Mean = 0ε)</span><br> <br> (<span class="emphasis"><em>GSL | ||
|  |                   1.16:</em></span> Max = 137ε (Mean = 13.8ε))<br> (<span class="emphasis"><em>Cephes:</em></span> | ||
|  |                   <span class="red">Max = +INFε (Mean = +INFε) <a class="link" href="../logs_and_tables/logs.html#errors_GNU_C_version_5_1_0_linux_double_zeta_Cephes_Zeta_Random_values_less_than_1">And | ||
|  |                   other failures.</a>)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 7.03ε (Mean = 2.71ε)</span><br> <br> | ||
|  |                   (<span class="emphasis"><em><tr1/cmath>:</em></span> Max = 538ε (Mean = 59.3ε)) | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 70.1ε (Mean = 17.1ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | </tr> | ||
|  | <tr> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   Zeta: Values close to and greater than 1 | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.994ε (Mean = 0.421ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0ε (Mean = 0ε)</span><br> <br> (<span class="emphasis"><em>GSL | ||
|  |                   1.16:</em></span> Max = 7.73ε (Mean = 4.07ε))<br> (<span class="emphasis"><em>Cephes:</em></span> | ||
|  |                   <span class="red">Max = 6.77e+15ε (Mean = 1.52e+15ε) <a class="link" href="../logs_and_tables/logs.html#errors_GNU_C_version_5_1_0_linux_double_zeta_Cephes_Zeta_Values_close_to_and_greater_than_1">And | ||
|  |                   other failures.</a>)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.995ε (Mean = 0.5ε)</span><br> <br> | ||
|  |                   (<span class="emphasis"><em><tr1/cmath>:</em></span> Max = 1.9e+06ε (Mean = 5.11e+05ε)) | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.995ε (Mean = 0.5ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | </tr> | ||
|  | <tr> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   Zeta: Values close to and less than 1 | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.991ε (Mean = 0.375ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0ε (Mean = 0ε)</span><br> <br> (<span class="emphasis"><em>GSL | ||
|  |                   1.16:</em></span> Max = 0.991ε (Mean = 0.28ε))<br> (<span class="emphasis"><em>Cephes:</em></span> | ||
|  |                   <span class="red">Max = 8.66e+15ε (Mean = 1.9e+15ε) <a class="link" href="../logs_and_tables/logs.html#errors_GNU_C_version_5_1_0_linux_double_zeta_Cephes_Zeta_Values_close_to_and_less_than_1">And | ||
|  |                   other failures.</a>)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.998ε (Mean = 0.508ε)</span><br> <br> | ||
|  |                   (<span class="emphasis"><em><tr1/cmath>:</em></span> Max = 8.53e+06ε (Mean = | ||
|  |                   1.87e+06ε)) | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0.998ε (Mean = 0.568ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | </tr> | ||
|  | <tr> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   Zeta: Integer arguments | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 6.5ε (Mean = 2.17ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 0ε (Mean = 0ε)</span><br> <br> (<span class="emphasis"><em>GSL | ||
|  |                   1.16:</em></span> Max = 3.75ε (Mean = 1.1ε))<br> (<span class="emphasis"><em>Cephes:</em></span> | ||
|  |                   <span class="red">Max = +INFε (Mean = +INFε) <a class="link" href="../logs_and_tables/logs.html#errors_GNU_C_version_5_1_0_linux_double_zeta_Cephes_Zeta_Integer_arguments">And | ||
|  |                   other failures.</a>)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 9ε (Mean = 3.06ε)</span><br> <br> | ||
|  |                   (<span class="emphasis"><em><tr1/cmath>:</em></span> Max = 70.3ε (Mean = 17.4ε)) | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | <td> | ||
|  |                 <p> | ||
|  |                   <span class="blue">Max = 21ε (Mean = 7.13ε)</span> | ||
|  |                 </p> | ||
|  |               </td> | ||
|  | </tr> | ||
|  | </tbody> | ||
|  | </table></div> | ||
|  | </div> | ||
|  | <br class="table-break"><h5> | ||
|  | <a name="math_toolkit.zetas.zeta.h3"></a> | ||
|  |         <span class="phrase"><a name="math_toolkit.zetas.zeta.testing"></a></span><a class="link" href="zeta.html#math_toolkit.zetas.zeta.testing">Testing</a> | ||
|  |       </h5> | ||
|  | <p> | ||
|  |         The tests for these functions come in two parts: basic sanity checks use | ||
|  |         spot values calculated using <a href="http://functions.wolfram.com/webMathematica/FunctionEvaluation.jsp?name=Zeta" target="_top">Mathworld's | ||
|  |         online evaluator</a>, while accuracy checks use high-precision test values | ||
|  |         calculated at 1000-bit precision with <a href="http://shoup.net/ntl/doc/RR.txt" target="_top">NTL::RR</a> | ||
|  |         and this implementation. Note that the generic and type-specific versions | ||
|  |         of these functions use differing implementations internally, so this gives | ||
|  |         us reasonably independent test data. Using our test data to test other "known | ||
|  |         good" implementations also provides an additional sanity check. | ||
|  |       </p> | ||
|  | <h5> | ||
|  | <a name="math_toolkit.zetas.zeta.h4"></a> | ||
|  |         <span class="phrase"><a name="math_toolkit.zetas.zeta.implementation"></a></span><a class="link" href="zeta.html#math_toolkit.zetas.zeta.implementation">Implementation</a> | ||
|  |       </h5> | ||
|  | <p> | ||
|  |         All versions of these functions first use the usual reflection formulas to | ||
|  |         make their arguments positive: | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../equations/zeta3.svg"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         The generic versions of these functions are implemented using the series: | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../equations/zeta6.svg"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         When the significand (mantissa) size is recognised (currently for 53, 64 | ||
|  |         and 113-bit reals, plus single-precision 24-bit handled via promotion to | ||
|  |         double) then a series of rational approximations <a class="link" href="../sf_implementation.html#math_toolkit.sf_implementation.rational_approximations_used">devised | ||
|  |         by JM</a> are used. | ||
|  |       </p> | ||
|  | <p> | ||
|  |         For 0 < z < 1 the approximating form is: | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../equations/zeta4.svg"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         For a rational approximation R(1-z) and a constant C. | ||
|  |       </p> | ||
|  | <p> | ||
|  |         For 1 < z < 4 the approximating form is: | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../equations/zeta5.svg"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         For a rational approximation R(n-z) and a constant C and integer n. | ||
|  |       </p> | ||
|  | <p> | ||
|  |         For z > 4 the approximating form is: | ||
|  |       </p> | ||
|  | <p> | ||
|  |         ζ(z) = 1 + e<sup>R(z - n)</sup> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         For a rational approximation R(z-n) and integer n, note that the accuracy | ||
|  |         required for R(z-n) is not full machine precision, but an absolute error | ||
|  |         of: ε/R(0). This saves us quite a few digits when dealing with large z, especially | ||
|  |         when ε is small. | ||
|  |       </p> | ||
|  | <p> | ||
|  |         Finally, there are some special cases for integer arguments, there are closed | ||
|  |         forms for negative or even integers: | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../equations/zeta7.svg"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../equations/zeta8.svg"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         <span class="inlinemediaobject"><img src="../../../equations/zeta9.svg"></span> | ||
|  |       </p> | ||
|  | <p> | ||
|  |         and for positive odd integers we simply cache pre-computed values as these | ||
|  |         are of great benefit to some infinite series calculations. | ||
|  |       </p> | ||
|  | </div> | ||
|  | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | ||
|  | <td align="left"></td> | ||
|  | <td align="right"><div class="copyright-footer">Copyright © 2006-2010, 2012-2014 Nikhar Agrawal, | ||
|  |       Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert | ||
|  |       Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan Råde, Gautam Sewani, | ||
|  |       Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p> | ||
|  |         Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
|  |         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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