EVOLUTION-MANAGER
Edit File: pdClasses.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: Positive-Definite Matrix Classes</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 pdClasses {nlme}"><tr><td>pdClasses {nlme}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Positive-Definite Matrix Classes</h2> <h3>Description</h3> <p>Standard classes of positive-definite matrices (<code>pdMat</code>) structures available in the <code>nlme</code> package. </p> <h3>Value</h3> <p>Available standard classes: </p> <table summary="R valueblock"> <tr valign="top"><td><code>pdSymm</code></td> <td> <p>general positive-definite matrix, with no additional structure</p> </td></tr> <tr valign="top"><td><code>pdLogChol</code></td> <td> <p>general positive-definite matrix, with no additional structure, using a log-Cholesky parameterization</p> </td></tr> <tr valign="top"><td><code>pdDiag</code></td> <td> <p>diagonal</p> </td></tr> <tr valign="top"><td><code>pdIdent</code></td> <td> <p>multiple of an identity</p> </td></tr> <tr valign="top"><td><code>pdCompSymm</code></td> <td> <p>compound symmetry structure (constant diagonal and constant off-diagonal elements)</p> </td></tr> <tr valign="top"><td><code>pdBlocked</code></td> <td> <p>block-diagonal matrix, with diagonal blocks of any "atomic" <code>pdMat</code> class</p> </td></tr> <tr valign="top"><td><code>pdNatural</code></td> <td> <p>general positive-definite matrix in natural parametrization (i.e. parametrized in terms of standard deviations and correlations). The underlying coefficients are not unrestricted, so this class should NOT be used for optimization.</p> </td></tr> </table> <h3>Note</h3> <p>Users may define their own <code>pdMat</code> classes by specifying a <code>constructor</code> function and, at a minimum, methods for the functions <code>pdConstruct</code>, <code>pdMatrix</code> and <code>coef</code>. For examples of these functions, see the methods for classes <code>pdSymm</code> and <code>pdDiag</code>. </p> <h3>Author(s)</h3> <p>José Pinheiro and Douglas Bates <a href="mailto:bates@stat.wisc.edu">bates@stat.wisc.edu</a></p> <h3>References</h3> <p>Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer. </p> <h3>See Also</h3> <p><code><a href="pdBlocked.html">pdBlocked</a></code>, <code><a href="pdCompSymm.html">pdCompSymm</a></code>, <code><a href="pdDiag.html">pdDiag</a></code>, <code><a href="pdFactor.html">pdFactor</a></code>, <code><a href="pdIdent.html">pdIdent</a></code>, <code><a href="pdMat.html">pdMat</a></code>, <code><a href="pdMatrix.html">pdMatrix</a></code>, <code><a href="pdNatural.html">pdNatural</a></code>, <code><a href="pdSymm.html">pdSymm</a></code>, <code><a href="pdLogChol.html">pdLogChol</a></code> </p> <hr /><div style="text-align: center;">[Package <em>nlme</em> version 3.1-139 <a href="00Index.html">Index</a>]</div> </body></html>