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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: Symmetric Dense Nonzero-Pattern 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 nsyMatrix-class {Matrix}"><tr><td>nsyMatrix-class {Matrix}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Symmetric Dense Nonzero-Pattern Matrices</h2> <h3>Description</h3> <p>The <code>"nsyMatrix"</code> class is the class of symmetric, dense nonzero-pattern matrices in non-packed storage and <code>"nspMatrix"</code> is the class of of these in packed storage. Only the upper triangle or the lower triangle is stored. </p> <h3>Objects from the Class</h3> <p>Objects can be created by calls of the form <code>new("nsyMatrix", ...)</code>. </p> <h3>Slots</h3> <dl> <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>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>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><code>"nsyMatrix"</code> extends class <code>"ngeMatrix"</code>, directly, whereas<br /> <code>"nspMatrix"</code> extends class <code>"ndenseMatrix"</code>, directly. </p> <p>Both extend class <code>"symmetricMatrix"</code>, directly, and class <code>"Matrix"</code> and others, <em>in</em>directly, use <code><a href="../../methods/html/RClassUtils.html">showClass</a>("nsyMatrix")</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="dsyMatrix")</code> for details. </p> <h3>See Also</h3> <p><code><a href="ngeMatrix-class.html">ngeMatrix</a></code>, <code><a href="Matrix-class.html">Matrix</a></code>, <code><a href="../../base/html/t.html">t</a></code> </p> <h3>Examples</h3> <pre> (s0 <- new("nsyMatrix")) (M2 <- Matrix(c(TRUE, NA,FALSE,FALSE), 2,2)) # logical dense (ltr) (sM <- M2 & t(M2)) # "lge" class(sM <- as(sM, "nMatrix")) # -> "nge" (sM <- as(sM, "nsyMatrix")) # -> "nsy" str ( sM <- as(sM, "nspMatrix")) # -> "nsp": packed symmetric </pre> <hr /><div style="text-align: center;">[Package <em>Matrix</em> version 1.2-17 <a href="00Index.html">Index</a>]</div> </body></html>