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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: Count the number of elements that satisfy given condition</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 list.count {rlist}"><tr><td>list.count {rlist}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Count the number of elements that satisfy given condition</h2> <h3>Description</h3> <p>Count the number of elements that satisfy given condition </p> <h3>Usage</h3> <pre> list.count(.data, cond) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>.data</code></td> <td> <p>A <code>list</code> or <code>vector</code></p> </td></tr> <tr valign="top"><td><code>cond</code></td> <td> <p>A logical lambda expression for each element of <code>.data</code> to evaluate. If <code>cond</code> is missing then the total number of elements in <code>.data</code> will be returned.</p> </td></tr> </table> <h3>Value</h3> <p>An integer that indicates the number of elements with which <code>cond</code> is evaluated to be <code>TRUE</code>. </p> <h3>Examples</h3> <pre> x <- list(p1 = list(type='A',score=list(c1=10,c2=8)), p2 = list(type='B',score=list(c1=9,c2=9)), p3 = list(type='B',score=list(c1=9,c2=7))) list.count(x, type=='B') list.count(x, min(unlist(score)) >= 9) </pre> <hr /><div style="text-align: center;">[Package <em>rlist</em> version 0.4.6.2 <a href="00Index.html">Index</a>]</div> </body></html>