EVOLUTION-MANAGER
Edit File: are_adjacent.html
<!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: Are two vertices adjacent?</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 are_adjacent {igraph}"><tr><td>are_adjacent {igraph}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Are two vertices adjacent?</h2> <h3>Description</h3> <p>The order of the vertices only matters in directed graphs, where the existence of a directed <code>(v1, v2)</code> edge is queried. </p> <h3>Usage</h3> <pre> are_adjacent(graph, v1, v2) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>graph</code></td> <td> <p>The graph.</p> </td></tr> <tr valign="top"><td><code>v1</code></td> <td> <p>The first vertex, tail in directed graphs.</p> </td></tr> <tr valign="top"><td><code>v2</code></td> <td> <p>The second vertex, head in directed graphs.</p> </td></tr> </table> <h3>Value</h3> <p>A logical scalar, <code>TRUE</code> is a <code>(v1, v2)</code> exists in the graph. </p> <h3>See Also</h3> <p>Other structural queries: <code><a href="sub-.igraph.html">[.igraph</a>()</code>, <code><a href="sub-sub-.igraph.html">[[.igraph</a>()</code>, <code><a href="adjacent_vertices.html">adjacent_vertices</a>()</code>, <code><a href="ends.html">ends</a>()</code>, <code><a href="get.edge.ids.html">get.edge.ids</a>()</code>, <code><a href="gorder.html">gorder</a>()</code>, <code><a href="gsize.html">gsize</a>()</code>, <code><a href="head_of.html">head_of</a>()</code>, <code><a href="incident_edges.html">incident_edges</a>()</code>, <code><a href="incident.html">incident</a>()</code>, <code><a href="is_directed.html">is_directed</a>()</code>, <code><a href="neighbors.html">neighbors</a>()</code>, <code><a href="tail_of.html">tail_of</a>()</code> </p> <h3>Examples</h3> <pre> ug <- make_ring(10) ug are_adjacent(ug, 1, 2) are_adjacent(ug, 2, 1) dg <- make_ring(10, directed = TRUE) dg are_adjacent(ug, 1, 2) are_adjacent(ug, 2, 1) </pre> <hr /><div style="text-align: center;">[Package <em>igraph</em> version 1.3.5 <a href="00Index.html">Index</a>]</div> </body></html>