EVOLUTION-MANAGER
Edit File: backSpline.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: Monotone Inverse Spline</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 backSpline {splines}"><tr><td>backSpline {splines}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Monotone Inverse Spline</h2> <h3>Description</h3> <p>Create a monotone inverse of a monotone natural spline. </p> <h3>Usage</h3> <pre> backSpline(object) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>object</code></td> <td> <p>an object that inherits from class <code>nbSpline</code> or <code>npolySpline</code>. That is, the object must represent a natural interpolation spline but it can be either in the B-spline representation or the piecewise polynomial one. The spline is checked to see if it represents a monotone function. </p> </td></tr> </table> <h3>Value</h3> <p>An object of class <code>polySpline</code> that contains the piecewise polynomial representation of a function that has the appropriate values and derivatives at the knot positions to be an inverse of the spline represented by <code>object</code>. Technically this object is not a spline because the second derivative is not constrained to be continuous at the knot positions. However, it is often a much better approximation to the inverse than fitting an interpolation spline to the y/x pairs. </p> <h3>Author(s)</h3> <p>Douglas Bates and Bill Venables</p> <h3>See Also</h3> <p><code><a href="interpSpline.html">interpSpline</a></code> </p> <h3>Examples</h3> <pre> require(graphics) ispl <- interpSpline( women$height, women$weight ) bspl <- backSpline( ispl ) plot( bspl ) # plots over the range of the knots points( women$weight, women$height ) </pre> <hr /><div style="text-align: center;">[Package <em>splines</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>