EVOLUTION-MANAGER
Edit File: expcov.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: Spatial Covariance Functions</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 expcov {spatial}"><tr><td>expcov {spatial}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2> Spatial Covariance Functions </h2> <h3>Description</h3> <p>Spatial covariance functions for use with <code>surf.gls</code>. </p> <h3>Usage</h3> <pre> expcov(r, d, alpha = 0, se = 1) gaucov(r, d, alpha = 0, se = 1) sphercov(r, d, alpha = 0, se = 1, D = 2) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>r</code></td> <td> <p>vector of distances at which to evaluate the covariance </p> </td></tr> <tr valign="top"><td><code>d</code></td> <td> <p>range parameter </p> </td></tr> <tr valign="top"><td><code>alpha</code></td> <td> <p>proportion of nugget effect </p> </td></tr> <tr valign="top"><td><code>se</code></td> <td> <p>standard deviation at distance zero </p> </td></tr> <tr valign="top"><td><code>D</code></td> <td> <p>dimension of spheres. </p> </td></tr></table> <h3>Value</h3> <p>vector of covariance values. </p> <h3>References</h3> <p>Ripley, B. D. (1981) <em>Spatial Statistics.</em> Wiley. </p> <p>Venables, W. N. and Ripley, B. D. (2002) <em>Modern Applied Statistics with S.</em> Fourth edition. Springer. </p> <h3>See Also</h3> <p><code><a href="surf.gls.html">surf.gls</a></code> </p> <h3>Examples</h3> <pre> data(topo, package="MASS") topo.kr <- surf.ls(2, topo) correlogram(topo.kr, 25) d <- seq(0, 7, 0.1) lines(d, expcov(d, 0.7)) </pre> <hr /><div style="text-align: center;">[Package <em>spatial</em> version 7.3-11 <a href="00Index.html">Index</a>]</div> </body></html>