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<div class="refentry">
<a name="boost.random.lagged_fibonacci_01"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template lagged_fibonacci_01</span></h2>
<p>boost::random::lagged_fibonacci_01</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_random/reference.html#header.boost.random.lagged_fibonacci_hpp" title="Header &lt;boost/random/lagged_fibonacci.hpp&gt;">boost/random/lagged_fibonacci.hpp</a>&gt;
</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> RealType<span class="special">,</span> <span class="keyword">int</span> w<span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> p<span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> q<span class="special">&gt;</span>
<span class="keyword">class</span> <a class="link" href="lagged_fibonacci_01.html" title="Class template lagged_fibonacci_01">lagged_fibonacci_01</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">RealType</span> <a name="boost.random.lagged_fibonacci_01.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="lagged_fibonacci_01.html#boost.random.lagged_fibonacci_01construct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="lagged_fibonacci_01.html#id1145072-bb"><span class="identifier">lagged_fibonacci_01</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="lagged_fibonacci_01.html#id1145085-bb"><span class="identifier">lagged_fibonacci_01</span></a><span class="special">(</span><span class="identifier">uint32_t</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Generator<span class="special">&gt;</span> <a class="link" href="lagged_fibonacci_01.html#id1145103-bb"><span class="identifier">lagged_fibonacci_01</span></a><span class="special">(</span><span class="identifier">Generator</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <a class="link" href="lagged_fibonacci_01.html#id1145128-bb"><span class="identifier">lagged_fibonacci_01</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="lagged_fibonacci_01.html#id1144935-bb">public member functions</a></span>
<span class="keyword">void</span> <a class="link" href="lagged_fibonacci_01.html#id1144938-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="lagged_fibonacci_01.html#id1144950-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">uint32_t</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Generator<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="lagged_fibonacci_01.html#id1144983-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">Generator</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="lagged_fibonacci_01.html#id1145023-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">result_type</span> <a class="link" href="lagged_fibonacci_01.html#id1145049-bb"><span class="identifier">min</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">result_type</span> <a class="link" href="lagged_fibonacci_01.html#id1145057-bb"><span class="identifier">max</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">result_type</span> <a class="link" href="lagged_fibonacci_01.html#id1145065-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="lagged_fibonacci_01.html#id1145147-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="lagged_fibonacci_01.html#id1145151-bb"><span class="identifier">validation</span></a><span class="special">(</span><span class="identifier">result_type</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> has_fixed_range<span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> word_size<span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> long_lag<span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> short_lag<span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id2490012"></a><h2>Description</h2>
<p>Instantiations of class template <code class="computeroutput">lagged_fibonacci_01</code> model a <a class="link" href="../../boost_random/reference.html#boost_random.reference.concepts.pseudo_random_number_generator" title="Pseudo-Random Number Generator">pseudo-random number generator</a> . It uses a lagged Fibonacci algorithm with two lags <code class="computeroutput">p</code> and <code class="computeroutput">q</code>, evaluated in floating-point arithmetic: x(i) = x(i-p) + x(i-q) (mod 1) with p &gt; q. See</p>
<p> </p>
<div class="blockquote"><blockquote class="blockquote"><p> "Uniform random number generators for supercomputers", Richard Brent, Proc. of Fifth Australian Supercomputer Conference, Melbourne, Dec. 1992, pp. 704-706. </p></blockquote></div>
<p> </p>
<p> </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p> The quality of the generator crucially depends on the choice of the parameters. User code should employ one of the sensibly parameterized generators such as <a class="link" href="../lagged_fibonacci607.html" title="Type definition lagged_fibonacci607">lagged_fibonacci607</a> instead. </p></td></tr>
</table></div>
<p> </p>
<p>The generator requires considerable amounts of memory for the storage of its state array. For example, <a class="link" href="../lagged_fibonacci607.html" title="Type definition lagged_fibonacci607">lagged_fibonacci607</a> requires about 4856 bytes and <a class="link" href="../lagged_fibonacci44497.html" title="Type definition lagged_fibonacci44497">lagged_fibonacci44497</a> requires about 350 KBytes. </p>
<div class="refsect2">
<a name="id2490095"></a><h3>
<a name="boost.random.lagged_fibonacci_01construct-copy-destruct"></a><code class="computeroutput">lagged_fibonacci_01</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id1145072-bb"></a><span class="identifier">lagged_fibonacci_01</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput">lagged_fibonacci_01</code> generator and calls <code class="computeroutput">seed()</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id1145085-bb"></a><span class="identifier">lagged_fibonacci_01</span><span class="special">(</span><span class="identifier">uint32_t</span> value<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput">lagged_fibonacci_01</code> generator and calls <code class="computeroutput">seed(value)</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Generator<span class="special">&gt;</span> <a name="id1145103-bb"></a><span class="identifier">lagged_fibonacci_01</span><span class="special">(</span><span class="identifier">Generator</span> <span class="special">&amp;</span> gen<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput">lagged_fibonacci_01</code> generator and calls <code class="computeroutput">seed(gen)</code>. </p>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <a name="id1145128-bb"></a><span class="identifier">lagged_fibonacci_01</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&amp;</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2490356"></a><h3>
<a name="id1144935-bb"></a><code class="computeroutput">lagged_fibonacci_01</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1144938-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Calls seed(331u). </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1144950-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">uint32_t</span> value<span class="special">)</span><span class="special">;</span></pre>
<p>Constructs a <code class="computeroutput"><a class="link" href="../minstd_rand0.html" title="Type definition minstd_rand0">minstd_rand0</a></code> generator with the constructor parameter value and calls seed with it. Distinct seeds in the range [1, 2147483647) will produce generators with different states. Other seeds will be equivalent to some seed within this range. See <code class="computeroutput"><a class="link" href="linear_congruential.html" title="Class template linear_congruential">linear_congruential</a></code> for details. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Generator<span class="special">&gt;</span> <span class="keyword">void</span> <a name="id1144983-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">Generator</span> <span class="special">&amp;</span> gen<span class="special">)</span><span class="special">;</span></pre>
<p>Sets the state of this <code class="computeroutput">lagged_fibonacci_01</code> to the values returned by p invocations of <code class="computeroutput"><a class="link" href="../uniform_01.html" title="Class template uniform_01">uniform_01</a></code><code class="computeroutput">&lt;RealType&gt;()(gen)</code>.</p>
<p>Complexity: Exactly p invocations of gen. </p>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> It<span class="special">&gt;</span> <span class="keyword">void</span> <a name="id1145023-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&amp;</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">result_type</span> <a name="id1145049-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">result_type</span> <a name="id1145057-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="identifier">result_type</span> <a name="id1145065-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2490775"></a><h3>
<a name="id1145147-bb"></a><code class="computeroutput">lagged_fibonacci_01</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="id1145151-bb"></a><span class="identifier">validation</span><span class="special">(</span><span class="identifier">result_type</span> x<span class="special">)</span><span class="special">;</span></pre></li></ol></div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2000 -2005 Jens Maurer, 2009 Steven Watanabe<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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