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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: Triangular Dense Logical Matrices</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 ltrMatrix-class {Matrix}"><tr><td>ltrMatrix-class {Matrix}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Triangular Dense Logical Matrices</h2> <h3>Description</h3> <p>The <code>"ltrMatrix"</code> class is the class of triangular, dense, logical matrices in nonpacked storage. The <code>"ltpMatrix"</code> class is the same except in packed storage. </p> <h3>Slots</h3> <dl> <dt><code>x</code>:</dt><dd><p>Object of class <code>"logical"</code>. The logical values that constitute the matrix, stored in column-major order.</p> </dd> <dt><code>uplo</code>:</dt><dd><p>Object of class <code>"character"</code>. Must be either "U", for upper triangular, and "L", for lower triangular.</p> </dd> <dt><code>diag</code>:</dt><dd><p>Object of class <code>"character"</code>. Must be either <code>"U"</code>, for unit triangular (diagonal is all ones), or <code>"N"</code>; see <code><a href="triangularMatrix-class.html">triangularMatrix</a></code>.</p> </dd> <dt><code>Dim</code>,<code>Dimnames</code>:</dt><dd><p>The dimension (a length-2 <code>"integer"</code>) and corresponding names (or <code>NULL</code>), see the <code><a href="Matrix-class.html">Matrix</a></code> class.</p> </dd> <dt><code>factors</code>:</dt><dd><p>Object of class <code>"list"</code>. A named list of factorizations that have been computed for the matrix.</p> </dd> </dl> <h3>Extends</h3> <p>Both extend classes <code>"<a href="ldenseMatrix-class.html">ldenseMatrix</a>"</code> and <code>"<a href="triangularMatrix-class.html">triangularMatrix</a>"</code>, directly; further, class <code>"Matrix"</code>, <code>"<a href="dMatrix-class.html">lMatrix</a>"</code> and others, <em>in</em>directly. Use <code><a href="../../methods/html/RClassUtils.html">showClass</a>("ltrMatrix")</code>, e.g., for details. </p> <h3>Methods</h3> <p>Currently, mainly <code><a href="../../base/html/t.html">t</a>()</code> and coercion methods (for <code><a href="../../methods/html/as.html">as</a>(.)</code>; use, e.g., <code><a href="../../methods/html/showMethods.html">showMethods</a>(class="ltpMatrix")</code> for details. </p> <h3>See Also</h3> <p>Classes <code><a href="lgeMatrix-class.html">lgeMatrix</a></code>, <code><a href="Matrix-class.html">Matrix</a></code>; function <code><a href="../../base/html/t.html">t</a></code> </p> <h3>Examples</h3> <pre> showClass("ltrMatrix") str(new("ltpMatrix")) (lutr <- as(upper.tri(matrix(,4,4)), "ltrMatrix")) str(lutp <- as(lutr, "ltpMatrix"))# packed matrix: only 10 = (4+1)*4/2 entries !lutp ## the logical negation (is *not* logical triangular !) ## but this one is: stopifnot(all.equal(lutp, as(!!lutp, "ltpMatrix"))) </pre> <hr /><div style="text-align: center;">[Package <em>Matrix</em> version 1.2-17 <a href="00Index.html">Index</a>]</div> </body></html>