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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Directed acyclic graphs</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for is_dag {igraph}"><tr><td>is_dag {igraph}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Directed acyclic graphs</h2> <h3>Description</h3> <p>This function tests whether the given graph is a DAG, a directed acyclic graph. </p> <h3>Usage</h3> <pre> is_dag(graph) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>graph</code></td> <td> <p>The input graph. It may be undirected, in which case <code>FALSE</code> is reported.</p> </td></tr> </table> <h3>Details</h3> <p><code>is_dag</code> checks whether there is a directed cycle in the graph. If not, the graph is a DAG. </p> <h3>Value</h3> <p>A logical vector of length one. </p> <h3>Author(s)</h3> <p>Tamas Nepusz <a href="mailto:ntamas@gmail.com">ntamas@gmail.com</a> for the C code, Gabor Csardi <a href="mailto:csardi.gabor@gmail.com">csardi.gabor@gmail.com</a> for the R interface. </p> <h3>Examples</h3> <pre> g <- make_tree(10) is_dag(g) g2 <- g + edge(5,1) is_dag(g2) </pre> <hr /><div style="text-align: center;">[Package <em>igraph</em> version 1.3.5 <a href="00Index.html">Index</a>]</div> </body></html>