<!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 documentation — 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" 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href="#">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">NetworkX documentation</a><ul> </ul> </li> <li><a class="reference internal" href="#indices-and-tables">Indices and tables</a></li> </ul> <h4>Next topic</h4> <p class="topless"><a href="overview.html" title="next chapter">Overview</a></p> <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"> <div class="section" id="networkx-documentation"> <span id="contents"></span><h1>NetworkX documentation<a class="headerlink" href="#networkx-documentation" title="Permalink to this headline">¶</a></h1> <table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Release:</th><td class="field-body">1.8.1</td> </tr> <tr class="field-even field"><th class="field-name">Date:</th><td class="field-body">October 23, 2013</td> </tr> </tbody> </table> <p>Tutorial <a class="reference download internal" href="_downloads/networkx_tutorial.pdf"><tt class="xref download docutils literal"><span class="pre">[PDF]</span></tt></a></p> <p>Reference <a class="reference download internal" href="_downloads/networkx_reference.pdf"><tt class="xref download docutils literal"><span class="pre">[PDF]</span></tt></a></p> <p>Tutorial+Reference <a class="reference download internal" href="_downloads/networkx-documentation.zip"><tt class="xref download docutils literal"><span class="pre">[HTML</span> <span class="pre">zip]</span></tt></a></p> <div class="toctree-wrapper compound"> <ul> <li class="toctree-l1"><a class="reference internal" href="overview.html">Overview</a><ul> <li class="toctree-l2"><a class="reference internal" href="overview.html#who-uses-networkx">Who uses NetworkX?</a></li> <li class="toctree-l2"><a class="reference internal" href="overview.html#goals">Goals</a></li> <li class="toctree-l2"><a class="reference internal" href="overview.html#the-python-programming-language">The Python programming language</a></li> <li class="toctree-l2"><a class="reference internal" href="overview.html#free-software">Free software</a></li> <li class="toctree-l2"><a class="reference internal" href="overview.html#history">History</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="download.html">Download</a><ul> <li class="toctree-l2"><a class="reference internal" href="download.html#software">Software</a></li> <li class="toctree-l2"><a class="reference internal" href="download.html#documentation">Documentation</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="install.html">Installing</a><ul> <li class="toctree-l2"><a class="reference internal" href="install.html#quick-install">Quick install</a></li> <li class="toctree-l2"><a class="reference internal" href="install.html#installing-from-source">Installing from source</a></li> <li class="toctree-l2"><a class="reference internal" href="install.html#requirements">Requirements</a></li> <li class="toctree-l2"><a class="reference internal" href="install.html#optional-packages">Optional packages</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="tutorial/index.html">Tutorial</a><ul> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html">Creating a graph</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#nodes">Nodes</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#edges">Edges</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#what-to-use-as-nodes-and-edges">What to use as nodes and edges</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#accessing-edges">Accessing edges</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#adding-attributes-to-graphs-nodes-and-edges">Adding attributes to graphs, nodes, and edges</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#directed-graphs">Directed graphs</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#multigraphs">Multigraphs</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#graph-generators-and-graph-operations">Graph generators and graph operations</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#analyzing-graphs">Analyzing graphs</a></li> <li class="toctree-l2"><a class="reference internal" href="tutorial/tutorial.html#drawing-graphs">Drawing graphs</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="reference/index.html">Reference</a><ul> <li class="toctree-l2"><a class="reference internal" href="reference/introduction.html">Introduction</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/classes.html">Graph types</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/algorithms.html">Algorithms</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/functions.html">Functions</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/generators.html">Graph generators</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/linalg.html">Linear algebra</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/convert.html">Converting to and from other data formats</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/relabel.html">Relabeling nodes</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/readwrite.html">Reading and writing graphs</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/drawing.html">Drawing</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/exceptions.html">Exceptions</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/utils.html">Utilities</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/legal.html">License</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/citing.html">Citing</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/credits.html">Credits</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/glossary.html">Glossary</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="test.html">Testing</a><ul> <li class="toctree-l2"><a class="reference internal" href="test.html#requirements-for-testing">Requirements for testing</a></li> <li class="toctree-l2"><a class="reference internal" href="test.html#testing-a-source-distribution">Testing a source distribution</a></li> <li class="toctree-l2"><a class="reference internal" href="test.html#testing-an-installed-package">Testing an installed package</a></li> <li class="toctree-l2"><a class="reference internal" href="test.html#testing-for-developers">Testing for developers</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="developer/index.html">Developer Guide</a><ul> <li class="toctree-l2"><a class="reference internal" href="developer/gitwash/index.html">Working with <em>networkx</em> source code</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="reference/history.html">History</a><ul> <li class="toctree-l2"><a class="reference internal" href="reference/api_changes.html">API changes</a></li> <li class="toctree-l2"><a class="reference internal" href="reference/news.html">Release Log</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="bibliography.html">Bibliography</a></li> <li class="toctree-l1"><a class="reference internal" href="examples/index.html">NetworkX Examples</a><ul> <li class="toctree-l2"><a class="reference internal" href="examples/3d_drawing/index.html">3D_Drawing</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/advanced/index.html">Advanced</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/algorithms/index.html">Algorithms</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/basic/index.html">Basic</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/drawing/index.html">Drawing</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/graph/index.html">Graph</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/javascript/index.html">Javascript</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/multigraph/index.html">Multigraph</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/pygraphviz/index.html">Pygraphviz</a></li> <li class="toctree-l2"><a class="reference internal" href="examples/subclass/index.html">Subclass</a></li> </ul> </li> </ul> </div> <ul class="simple"> <li><a class="reference external" href="gallery.html">Gallery</a></li> </ul> </div> <div class="section" id="indices-and-tables"> <h1>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Permalink to this headline">¶</a></h1> <ul 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