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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: Expand a Decomposition into Factors</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 expand {Matrix}"><tr><td>expand {Matrix}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Expand a Decomposition into Factors</h2> <h3>Description</h3> <p>Expands decompositions stored in compact form into factors. </p> <h3>Usage</h3> <pre> expand(x, ...) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>x</code></td> <td> <p>a matrix decomposition.</p> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>further arguments passed to or from other methods.</p> </td></tr> </table> <h3>Details</h3> <p>This is a generic function with special methods for different types of decompositions, see <code><a href="../../methods/html/showMethods.html">showMethods</a>(expand)</code> to list them all. </p> <h3>Value</h3> <p>The expanded decomposition, typically a list of matrix factors. </p> <h3>Note</h3> <p>Factors for decompositions such as <code>lu</code> and <code>qr</code> can be stored in a compact form. The function <code>expand</code> allows all factors to be fully expanded. </p> <h3>See Also</h3> <p>The LU <code><a href="lu.html">lu</a></code>, and the <code><a href="Cholesky.html">Cholesky</a></code> decompositions which have <code>expand</code> methods; <code><a href="facmul.html">facmul</a></code>. </p> <h3>Examples</h3> <pre> (x <- Matrix(round(rnorm(9),2), 3, 3)) (ex <- expand(lux <- lu(x))) </pre> <hr /><div style="text-align: center;">[Package <em>Matrix</em> version 1.2-17 <a href="00Index.html">Index</a>]</div> </body></html>