<p><div><div><div><div data-width="100" data-show-faces="false" data-send="true" data-layout="button_count" data-height="21" data-href="https://www.r-bloggers.com/network-analysis-part-1-exercises/"></div></div><div><a data-url="https://www.r-bloggers.com/network-analysis-part-1-exercises/" data-counturl="https://www.r-bloggers.com/network-analysis-part-1-exercises/" data-count="horizontal" data-text="Network Analysis Part 1 Exercises" class="twitter-share-button" data-via="rbloggers" href="https://twitter.com/share"></a></div><div></div></div><div></div></div>
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(This article was first published on <strong><a href="http://r-exercises.com/2016/09/15/network-analysis-part-1-exercises/"> R-exercises</a></strong>, and kindly contributed to <a rel="nofollow" href="https://www.r-bloggers.com/">R-bloggers)</a> </div>
<p><a target="_blank" href="http://r-exercises.com/wp-content/uploads/2016/09/main-graph.png?cfa4f2"><img sizes="(max-width: 250px) 100vw, 250px" alt="main-graph" class="wp-image-1894" src="https://i2.wp.com/r-exercises.com/wp-content/uploads/2016/09/main-graph-300x300.png?resize=250%2C250" data-recalc-dims="1"></a></p>
<p>In this set of exercises we shall create an empty graph and practice the functions for basic manipulation with vertices and edges, using the package <code>igraph</code>. If you don’t have the package already installed, install it using the following code:</p>
<p>
<code><br>
install.packages(&quot;igraph&quot;)<br>
</code>
</p>
<p>and load it into the session using the following code:</p>
<p>
<code><br>
library(&quot;igraph&quot;)<br>
</code>
</p>
<p>before proceeding. You can find more info about the package and graphs in general <a target="_blank" href="http://kateto.net/networks-r-igraph">here</a></p>
<p>Answers to the exercises are available <a target="_blank" href="http://r-exercises.com/2016/09/15/network-analysis-part-1-solutions/">here</a>.</p>
<p>If you have different solution, feel free to post it.</p>
<p>
<strong>Exercise 1</strong>
</p>
<p>Create an empty directed graph with 5 nodes. Set color of all nodes to yellow and shape to sphere.</p>
<p>
<strong>Exercise 2</strong>
</p>
<p>Add the following edges to the graph: 1->2, 1->3, 2->4, 3->4, 4->5.</p>
<p>
<strong>Exercise 3</strong>
</p>
<p>Add a vertex to the graph, color it to red and add edges: 3->6, 6->5. Set vertex shape to sphere.</p>
<p>
<strong>Exercise 4</strong>
</p>
<p>
Replace edge 1->3 with the edge 3->1.
</p>
<p>
<strong>Exercise 5</strong>
</p>
<p>Name vertices with letters A-F. List all vertices and edges.
</p>
<p>
<strong>Exercise 6</strong>
</p>
<p>What is the shortest path between vertices A and E.</p>
<p>
<strong>Exercise 7</strong>
</p>
<p>Plot the graph. The size of a vertex should depend on the number of incoming edges.</p>
<p>
<strong>Exercise 8</strong>
</p>
<p>Plot the distribution of vertices degrees.</p>
<p>
<strong>Exercise 9</strong>
</p>
<p>Create a heatmap from the data.
</p>
<p>
<strong>Exercise 10</strong>
</p>
<p>Create graph from subset of vertices with 1 or more incoming edges and plot it. Set the vertice shape to green box. The size of a vertice should depend on the number of outcoming edges.</p>
<p><div><div><div><div data-width="55" data-show-faces="false" data-send="true" data-layout="box_count" data-height="62" data-href="https://www.r-bloggers.com/network-analysis-part-1-exercises/"></div></div><div><a data-url="https://www.r-bloggers.com/network-analysis-part-1-exercises/" data-counturl="https://www.r-bloggers.com/network-analysis-part-1-exercises/" data-count="vertical" data-text="Network Analysis Part 1 Exercises" class="twitter-share-button" data-via="rbloggers" href="https://twitter.com/share"></a></div><div></div></div><div></div></div>
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<div>To <strong>leave a comment</strong> for the author, please follow the link and comment on their blog: <strong><a href="http://r-exercises.com/2016/09/15/network-analysis-part-1-exercises/"> R-exercises</a></strong>.</div>
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