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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: Taper a Time Series by a Cosine Bell</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 spec.taper {stats}"><tr><td>spec.taper {stats}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Taper a Time Series by a Cosine Bell</h2> <h3>Description</h3> <p>Apply a cosine-bell taper to a time series. </p> <h3>Usage</h3> <pre> spec.taper(x, p = 0.1) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>x</code></td> <td> <p>A univariate or multivariate time series</p> </td></tr> <tr valign="top"><td><code>p</code></td> <td> <p>The proportion to be tapered at each end of the series, either a scalar (giving the proportion for all series) or a vector of the length of the number of series (giving the proportion for each series).</p> </td></tr> </table> <h3>Details</h3> <p>The cosine-bell taper is applied to the first and last <code>p[i]</code> observations of time series <code>x[, i]</code>. </p> <h3>Value</h3> <p>A new time series object. </p> <h3>See Also</h3> <p><code><a href="spec.pgram.html">spec.pgram</a></code>, <code><a href="cpgram.html">cpgram</a></code> </p> <hr /><div style="text-align: center;">[Package <em>stats</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>