<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="Docutils 0.6: http://docutils.sourceforge.net/" />
<title>Parallel BGL R-MAT generator</title>
<link rel="stylesheet" href="../../../../rst.css" type="text/css" />
</head>
<body>
<div class="document" id="logo-r-mat-generator">
<h1 class="title"><a class="reference external" href="http://www.osl.iu.edu/research/pbgl"><img align="middle" alt="Parallel BGL" class="align-middle" src="pbgl-logo.png" /></a> R-MAT generator</h1>

<!-- Copyright (C) 2004-2009 The Trustees of Indiana University.
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt) -->
<pre class="literal-block">
 template&lt;typename RandomGenerator, typename Graph&gt;
 class rmat_iterator
 {
 public:
   typedef std::input_iterator_tag iterator_category;
   typedef std::pair&lt;vertices_size_type, vertices_size_type&gt; value_type;
   typedef const value_type&amp; reference;
   typedef const value_type* pointer;
   typedef void difference_type;

   rmat_iterator();
   rmat_iterator(RandomGenerator&amp; gen, vertices_size_type n,
                 edges_size_type m, double a, double b, double c,
                 double d, bool permute_vertices = true);
   // Iterator operations
   reference operator*() const;
   pointer operator-&gt;() const;
   rmat_iterator&amp; operator++();
   rmat_iterator operator++(int);
   bool operator==(const rmat_iterator&amp; other) const;
   bool operator!=(const rmat_iterator&amp; other) const;
};
</pre>
<p>This class template implements a generator for R-MAT graphs <a class="citation-reference" href="#czf04" id="id1">[CZF04]</a>,
suitable for initializing an adjacency_list or other graph structure
with iterator-based initialization. An R-MAT graph has a scale-free
distribution w.r.t. vertex degree and is implemented using
Recursive-MATrix partitioning.</p>
<div class="section" id="where-defined">
<h1>Where Defined</h1>
<p>&lt;<tt class="docutils literal"><span class="pre">boost/graph/rmat_graph_generator.hpp</span></tt>&gt;</p>
</div>
<div class="section" id="constructors">
<h1>Constructors</h1>
<pre class="literal-block">
rmat_iterator();
</pre>
<p>Constructs a past-the-end iterator.</p>
<pre class="literal-block">
rmat_iterator(RandomGenerator&amp; gen, vertices_size_type n,
              edges_size_type m, double a, double b, double c,
              double d, bool permute_vertices = true);
</pre>
<p>Constructs an R-MAT generator iterator that creates a graph with <tt class="docutils literal"><span class="pre">n</span></tt>
vertices and <tt class="docutils literal"><span class="pre">m</span></tt> edges.  <tt class="docutils literal"><span class="pre">a</span></tt>, <tt class="docutils literal"><span class="pre">b</span></tt>, <tt class="docutils literal"><span class="pre">c</span></tt>, and <tt class="docutils literal"><span class="pre">d</span></tt> represent
the probability that a generated edge is placed of each of the 4
quadrants of the partitioned adjacency matrix.  Probabilities are
drawn from the random number generator gen.  Vertex indices are
permuted to eliminate locality when <tt class="docutils literal"><span class="pre">permute_vertices</span></tt> is true.</p>
</div>
<div class="section" id="example">
<h1>Example</h1>
<pre class="literal-block">
#include &lt;boost/graph/adjacency_list.hpp&gt;
#include &lt;boost/graph/rmat_graph_generator.hpp&gt;
#include &lt;boost/random/linear_congruential.hpp&gt;

typedef boost::adjacency_list&lt;&gt; Graph;
typedef boost::rmat_iterator&lt;boost::minstd_rand, Graph&gt; RMATGen;

int main()
{
  boost::minstd_rand gen;
  // Create graph with 100 nodes and 400 edges
  Graph g(RMATGen(gen, 100, 400, 0.57, 0.19, 0.19, 0.05), RMATGen(), 100);
  return 0;
}
</pre>
</div>
<div class="section" id="bibliography">
<h1>Bibliography</h1>
<table class="docutils citation" frame="void" id="czf04" rules="none">
<colgroup><col class="label" /><col /></colgroup>
<tbody valign="top">
<tr><td class="label"><a class="fn-backref" href="#id1">[CZF04]</a></td><td>D Chakrabarti, Y Zhan, and C Faloutsos.  R-MAT: A Recursive
Model for Graph Mining. In Proceedings of 4th International Conference
on Data Mining, pages 442--446, 2004.</td></tr>
</tbody>
</table>
<hr class="docutils" />
<p>Copyright (C) 2009 The Trustees of Indiana University.</p>
<p>Authors: Nick Edmonds and Andrew Lumsdaine</p>
</div>
</div>
<div class="footer">
<hr class="footer" />
Generated on: 2009-05-31 00:21 UTC.
Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.

</div>
</body>
</html>