<!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"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>networkx.generators.stochastic — NetworkX 1.8.1 documentation</title> <link rel="stylesheet" href="../../../_static/networkx.css" type="text/css" /> <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../../', VERSION: '1.8.1', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: false }; </script> <script type="text/javascript" src="../../../_static/jquery.js"></script> <script type="text/javascript" src="../../../_static/underscore.js"></script> <script type="text/javascript" src="../../../_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within NetworkX 1.8.1 documentation" href="../../../_static/opensearch.xml"/> <link rel="top" title="NetworkX 1.8.1 documentation" href="../../../index.html" /> <link rel="up" title="networkx" href="../../networkx.html" /> </head> <body> <div style="color: black;background-color: white; font-size: 3.2em; text-align: left; padding: 15px 10px 10px 15px"> NetworkX </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../../../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../../../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li><a href="http://networkx.github.com/">NetworkX Home </a> | </li> <li><a href="http://networkx.github.com/documentation.html">Documentation </a>| </li> <li><a href="http://networkx.github.com/download.html">Download </a> | </li> <li><a href="http://github.com/networkx">Developer (Github)</a></li> <li><a href="../../index.html" >Module code</a> »</li> <li><a href="../../networkx.html" accesskey="U">networkx</a> »</li> </ul> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../../../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <h1>Source code for networkx.generators.stochastic</h1><div class="highlight"><pre> <span class="sd">"""Stocastic graph."""</span> <span class="c"># Copyright (C) 2010-2013 by</span> <span class="c"># Aric Hagberg <hagberg@lanl.gov></span> <span class="c"># Dan Schult <dschult@colgate.edu></span> <span class="c"># Pieter Swart <swart@lanl.gov></span> <span class="c"># All rights reserved.</span> <span class="c"># BSD license.</span> <span class="kn">import</span> <span class="nn">networkx</span> <span class="kn">as</span> <span class="nn">nx</span> <span class="n">__author__</span> <span class="o">=</span> <span class="s">"Aric Hagberg <aric.hagberg@gmail.com>"</span> <span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s">'stochastic_graph'</span><span class="p">]</span> <div class="viewcode-block" id="stochastic_graph"><a class="viewcode-back" href="../../../reference/generated/networkx.generators.stochastic.stochastic_graph.html#networkx.generators.stochastic.stochastic_graph">[docs]</a><span class="k">def</span> <span class="nf">stochastic_graph</span><span class="p">(</span><span class="n">G</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">weight</span><span class="o">=</span><span class="s">'weight'</span><span class="p">):</span> <span class="sd">"""Return a right-stochastic representation of G.</span> <span class="sd"> A right-stochastic graph is a weighted digraph in which all of</span> <span class="sd"> the node (out) neighbors edge weights sum to 1.</span> <span class="sd"> Parameters</span> <span class="sd"> -----------</span> <span class="sd"> G : graph</span> <span class="sd"> A NetworkX graph</span> <span class="sd"> copy : boolean, optional</span> <span class="sd"> If True make a copy of the graph, otherwise modify the original graph</span> <span class="sd"> weight : edge attribute key (optional, default='weight')</span> <span class="sd"> Edge data key used for weight. If no attribute is found for an edge</span> <span class="sd"> the edge weight is set to 1.</span> <span class="sd"> """</span> <span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">G</span><span class="p">)</span> <span class="o">==</span> <span class="n">nx</span><span class="o">.</span><span class="n">MultiGraph</span> <span class="ow">or</span> <span class="nb">type</span><span class="p">(</span><span class="n">G</span><span class="p">)</span> <span class="o">==</span> <span class="n">nx</span><span class="o">.</span><span class="n">MultiDiGraph</span><span class="p">:</span> <span class="k">raise</span> <span class="n">nx</span><span class="o">.</span><span class="n">NetworkXError</span><span class="p">(</span><span class="s">'stochastic_graph not implemented '</span> <span class="s">'for multigraphs'</span><span class="p">)</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">G</span><span class="o">.</span><span class="n">is_directed</span><span class="p">():</span> <span class="k">raise</span> <span class="n">nx</span><span class="o">.</span><span class="n">NetworkXError</span><span class="p">(</span><span class="s">'stochastic_graph not implemented '</span> <span class="s">'for undirected graphs'</span><span class="p">)</span> <span class="k">if</span> <span class="n">copy</span><span class="p">:</span> <span class="n">W</span> <span class="o">=</span> <span class="n">nx</span><span class="o">.</span><span class="n">DiGraph</span><span class="p">(</span><span class="n">G</span><span class="p">)</span> <span class="k">else</span><span class="p">:</span> <span class="n">W</span> <span class="o">=</span> <span class="n">G</span> <span class="c"># reference original graph, no copy</span> <span class="n">degree</span> <span class="o">=</span> <span class="n">W</span><span class="o">.</span><span class="n">out_degree</span><span class="p">(</span><span class="n">weight</span><span class="o">=</span><span class="n">weight</span><span class="p">)</span> <span class="k">for</span> <span class="p">(</span><span class="n">u</span><span class="p">,</span><span class="n">v</span><span class="p">,</span><span class="n">d</span><span class="p">)</span> <span class="ow">in</span> <span class="n">W</span><span class="o">.</span><span class="n">edges</span><span class="p">(</span><span class="n">data</span><span class="o">=</span><span class="bp">True</span><span class="p">):</span> <span class="n">d</span><span class="p">[</span><span class="n">weight</span><span class="p">]</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="n">d</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">weight</span><span class="p">,</span><span class="mf">1.0</span><span class="p">))</span><span class="o">/</span><span class="n">degree</span><span class="p">[</span><span class="n">u</span><span class="p">]</span> <span class="k">return</span> <span class="n">W</span></div> </pre></div> </div> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../../../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../../../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li><a href="http://networkx.github.com/">NetworkX Home </a> | </li> <li><a href="http://networkx.github.com/documentation.html">Documentation </a>| </li> <li><a href="http://networkx.github.com/download.html">Download </a> | </li> <li><a href="http://github.com/networkx">Developer (Github)</a></li> <li><a href="../../index.html" >Module code</a> »</li> <li><a href="../../networkx.html" >networkx</a> »</li> </ul> </div> <div class="footer"> © Copyright 2013, NetworkX Developers. 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