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<div class="section" id="lanl-routes">
<span id="drawing-lanl-routes"></span><h1>Lanl Routes<a class="headerlink" href="#lanl-routes" title="Permalink to this headline">ΒΆ</a></h1>
<p>[<a class="reference external" href="../../_static/examples/lanl_routes.py">source code</a>]</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c">#!/usr/bin/env python</span>
<span class="sd">"""</span>
<span class="sd">Routes to LANL from 186 sites on the Internet.</span>
<span class="sd">This uses Graphviz for layout so you need PyGraphviz or Pydot.</span>
<span class="sd">"""</span>
<span class="n">__author__</span> <span class="o">=</span> <span class="s">"""Aric Hagberg (hagberg@lanl.gov)"""</span>
<span class="c"># Copyright (C) 2004-2008</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="k">def</span> <span class="nf">lanl_graph</span><span class="p">():</span>
<span class="sd">""" Return the lanl internet view graph from lanl.edges</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">networkx</span> <span class="kn">as</span> <span class="nn">nx</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">fh</span><span class="o">=</span><span class="nb">open</span><span class="p">(</span><span class="s">'lanl_routes.edgelist'</span><span class="p">,</span><span class="s">'r'</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">IOError</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"lanl.edges not found"</span>
<span class="k">raise</span>
<span class="n">G</span><span class="o">=</span><span class="n">nx</span><span class="o">.</span><span class="n">Graph</span><span class="p">()</span>
<span class="n">time</span><span class="o">=</span><span class="p">{}</span>
<span class="n">time</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">=</span><span class="mi">0</span> <span class="c"># assign 0 to center node</span>
<span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">fh</span><span class="o">.</span><span class="n">readlines</span><span class="p">():</span>
<span class="p">(</span><span class="n">head</span><span class="p">,</span><span class="n">tail</span><span class="p">,</span><span class="n">rtt</span><span class="p">)</span><span class="o">=</span><span class="n">line</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
<span class="n">G</span><span class="o">.</span><span class="n">add_edge</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">head</span><span class="p">),</span><span class="nb">int</span><span class="p">(</span><span class="n">tail</span><span class="p">))</span>
<span class="n">time</span><span class="p">[</span><span class="nb">int</span><span class="p">(</span><span class="n">head</span><span class="p">)]</span><span class="o">=</span><span class="nb">float</span><span class="p">(</span><span class="n">rtt</span><span class="p">)</span>
<span class="c"># get largest component and assign ping times to G0time dictionary</span>
<span class="n">G0</span><span class="o">=</span><span class="n">nx</span><span class="o">.</span><span class="n">connected_component_subgraphs</span><span class="p">(</span><span class="n">G</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">G0</span><span class="o">.</span><span class="n">rtt</span><span class="o">=</span><span class="p">{}</span>
<span class="k">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">G0</span><span class="p">:</span>
<span class="n">G0</span><span class="o">.</span><span class="n">rtt</span><span class="p">[</span><span class="n">n</span><span class="p">]</span><span class="o">=</span><span class="n">time</span><span class="p">[</span><span class="n">n</span><span class="p">]</span>
<span class="k">return</span> <span class="n">G0</span>
<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">'__main__'</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">networkx</span> <span class="kn">as</span> <span class="nn">nx</span>
<span class="kn">import</span> <span class="nn">math</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">networkx</span> <span class="kn">import</span> <span class="n">graphviz_layout</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ImportError</span><span class="p">(</span><span class="s">"This example needs Graphviz and either PyGraphviz or Pydot"</span><span class="p">)</span>
<span class="n">G</span><span class="o">=</span><span class="n">lanl_graph</span><span class="p">()</span>
<span class="k">print</span> <span class="s">"graph has </span><span class="si">%d</span><span class="s"> nodes with </span><span class="si">%d</span><span class="s"> edges"</span>\
<span class="o">%</span><span class="p">(</span><span class="n">nx</span><span class="o">.</span><span class="n">number_of_nodes</span><span class="p">(</span><span class="n">G</span><span class="p">),</span><span class="n">nx</span><span class="o">.</span><span class="n">number_of_edges</span><span class="p">(</span><span class="n">G</span><span class="p">))</span>
<span class="k">print</span> <span class="n">nx</span><span class="o">.</span><span class="n">number_connected_components</span><span class="p">(</span><span class="n">G</span><span class="p">),</span><span class="s">"connected components"</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">(</span><span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">8</span><span class="p">,</span><span class="mi">8</span><span class="p">))</span>
<span class="c"># use graphviz to find radial layout</span>
<span class="n">pos</span><span class="o">=</span><span class="n">nx</span><span class="o">.</span><span class="n">graphviz_layout</span><span class="p">(</span><span class="n">G</span><span class="p">,</span><span class="n">prog</span><span class="o">=</span><span class="s">"twopi"</span><span class="p">,</span><span class="n">root</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="c"># draw nodes, coloring by rtt ping time</span>
<span class="n">nx</span><span class="o">.</span><span class="n">draw</span><span class="p">(</span><span class="n">G</span><span class="p">,</span><span class="n">pos</span><span class="p">,</span>
<span class="n">node_color</span><span class="o">=</span><span class="p">[</span><span class="n">G</span><span class="o">.</span><span class="n">rtt</span><span class="p">[</span><span class="n">v</span><span class="p">]</span> <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">G</span><span class="p">],</span>
<span class="n">with_labels</span><span class="o">=</span><span class="bp">False</span><span class="p">,</span>
<span class="n">alpha</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span>
<span class="n">node_size</span><span class="o">=</span><span class="mi">15</span><span class="p">)</span>
<span class="c"># adjust the plot limits</span>
<span class="n">xmax</span><span class="o">=</span><span class="mf">1.02</span><span class="o">*</span><span class="nb">max</span><span class="p">(</span><span class="n">xx</span> <span class="k">for</span> <span class="n">xx</span><span class="p">,</span><span class="n">yy</span> <span class="ow">in</span> <span class="n">pos</span><span class="o">.</span><span class="n">values</span><span class="p">())</span>
<span class="n">ymax</span><span class="o">=</span><span class="mf">1.02</span><span class="o">*</span><span class="nb">max</span><span class="p">(</span><span class="n">yy</span> <span class="k">for</span> <span class="n">xx</span><span class="p">,</span><span class="n">yy</span> <span class="ow">in</span> <span class="n">pos</span><span class="o">.</span><span class="n">values</span><span class="p">())</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlim</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="n">xmax</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylim</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="n">ymax</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">savefig</span><span class="p">(</span><span class="s">"lanl_routes.png"</span><span class="p">)</span>
</pre></div>
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