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<a href="#NAME">NAME</a>
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<a href="#SYNOPSIS">SYNOPSIS</a>
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<a href="#DESCRIPTION">DESCRIPTION</a>
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<a href="#PARAMETERS">PARAMETERS</a>
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<a href="#OUTPUT">OUTPUT</a>
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<a href="#EXAMPLES">EXAMPLES</a>
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<a href="#SEE-ALSO">SEE ALSO</a>
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<a href="#REFERENCES">REFERENCES</a>
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<a href="#AUTHORS">AUTHORS</a>
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<ol class='man-decor man-head man head'>
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<li class='tl'>node_components(1)</li>
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<li class='tc'>www.complex-networks.net</li>
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<li class='tr'>node_components(1)</li>
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</ol>
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<h2 id="NAME">NAME</h2>
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<p class="man-name">
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<code>node_components</code> - <span class="man-whatis">Find the components associated to a specific node</span>
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</p>
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<h2 id="SYNOPSIS">SYNOPSIS</h2>
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<p><code>node_components</code> <var>graph_in</var> <var>node</var> [<var>component</var> [SHOW]]</p>
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<h2 id="DESCRIPTION">DESCRIPTION</h2>
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<p><code>node_components</code> finds the components associated to the node <var>node</var>
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of the graph <var>graph_in</var> provided as input, and prints on output the
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size of those components. The value of the third parameter <var>component</var>
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can be set to <code>IN</code>, <code>OUT</code>, <code>INOUT</code>, <code>SSC</code>, <code>WCC</code>, or <code>ALL</code>. According
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to the value of <var>component</var>, the program will compute the IN-component
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(<code>IN</code>), the OUT-component (<code>OUT</code>), both the IN- and OUT-component
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(<code>INOUT</code>), the strongly connected components (<code>SCC</code>), or the
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weakly-connected component (<code>WCC</code>) to which <var>node</var> belongs. If the
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third parameter is omitted or equal to <code>ALL</code>, then <code>node_components</code>
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computes all the components associated to <var>node</var>. If <code>SHOW</code> is
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specified as the fourth parameter, the program also shows the list of
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nodes which belong to each of the required components.</p>
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<h2 id="PARAMETERS">PARAMETERS</h2>
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<dl>
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<dt><var>graph_in</var></dt><dd> input graph (edge list) if equal to <code>-</code> (dash), read the edge list
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from STDIN.</dd>
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<dt class="flush"><var>node</var></dt><dd><p> the label of the node.</p></dd>
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<dt><var>component</var></dt><dd><p> the component to compute. Can be set to one of <code>IN</code>
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(IN-component), <code>OUT</code> (OUT-component), <code>INOUT</code> (both the IN- and
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the OUT-component), <code>SSC</code> (strongly connected component), <code>WCC</code>
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(weakly connected component), or <code>ALL</code> (all the above). If
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<var>component</var> is not set, compute all the components.</p></dd>
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<dt class="flush">SHOW</dt><dd><p> If the (optional) fourth parameter is equal to <code>SHOW</code>, the program
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will dump on output the list of all the nodes belonging to each
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component.</p></dd>
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</dl>
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<h2 id="OUTPUT">OUTPUT</h2>
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<p><code>node_components</code> prints on the standard output the size of the
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required components, one per line, in the format:</p>
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<pre><code>comp_type_1: size_1
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comp_type_2: size_2
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.....
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</code></pre>
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<p>where <code>comp_type_1</code> is the type of component (one of <code>IN</code>, <code>OUT</code>,
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<code>SCC</code>, or <code>WCC</code>) and <code>size_1</code> is its size, and so on. Notice that the
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sizes are not sorted. If <code>SHOW</code> is given, the program shows the list
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of nodes belonging to each component, in the format:</p>
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<pre><code>comp_type_1: size_1 node_1 node_2 node_3 ...
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comp_type_2: size_2 node_1 node_2 node_3 ...
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</code></pre>
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<h2 id="EXAMPLES">EXAMPLES</h2>
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<p>We can use <code>node_components</code> to compute the IN-component of a specific
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node. For instance, the command:</p>
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<pre><code> $ node_components web-NotreDame.net 2711 IN
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IN: 53968
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$
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</code></pre>
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<p>computes the size of the IN-component of node 2711 in the graph
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<code>www_nd.net</code> (WWW Notre Dame). This component contains 53968
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nodes. Similarly:</p>
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<pre><code> $ node_components web-NotreDame.net 2711 OUT SHOW
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OUT: 21 559 2711 2712 2713 2714 2715 2716 ... 33271 33272
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$
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</code></pre>
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<p>computes and shows the OUT-component of node 2711, which contains 21
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nodes, including node 2711. Finally, we can obtain the size of all the
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components associated to node 2711 by running:</p>
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<pre><code> $ node_components web-NotreDame.net 2711
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IN: 53986
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OUT: 21
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WCC: 325729
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SCC: 18
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$
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</code></pre>
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<p>In this case, the IN-component of node 2711 contains 53986 nodes, the
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OUT-component contains 21 nodes, the weakly connected components
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contains 325729 nodes (the whole graph), and the strongly connected
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component contains 18 nodes. It is also possible to show the list of
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nodes belonging to each component by providing <code>SHOW</code> as fourth
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parameter. IN this case, it is better to save the output of
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<code>node_components</code> into a file, e.g. by using:</p>
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<pre><code> $ node_components web-NotreDame.net 2711 ALL SHOW > web-NotreDame.net_components_2711
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</code></pre>
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<h2 id="SEE-ALSO">SEE ALSO</h2>
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<p><span class="man-ref">components<span class="s">(1)</span></span>, <span class="man-ref">strong_conn<span class="s">(1)</span></span>, <span class="man-ref">largest_component<span class="s">(1)</span></span></p>
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<h2 id="REFERENCES">REFERENCES</h2>
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<ul>
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<li><p>V. Latora, V. Nicosia, G. Russo, "Complex Networks: Principles,
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Methods and Applications", Chapter 6, Cambridge University Press
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(2017)</p></li>
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<li><p>V. Latora, V. Nicosia, G. Russo, "Complex Networks: Principles,
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Methods and Applications", Appendix 8, Cambridge University Press
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(2017)</p></li>
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</ul>
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<h2 id="AUTHORS">AUTHORS</h2>
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<p>(c) (c) Vincenzo 'KatolaZ' Nicosia 2009-2017 <code><v.nicosia@qmul.ac.uk></code>.</p>
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<ol class='man-decor man-foot man foot'>
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<li class='tl'>www.complex-networks.net</li>
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<li class='tc'>September 2017</li>
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<li class='tr'>node_components(1)</li>
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</ol>
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