EVOLUTION-MANAGER
Edit File: pluton.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: Isotopic Composition Plutonium Batches</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 pluton {cluster}"><tr><td>pluton {cluster}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Isotopic Composition Plutonium Batches</h2> <h3>Description</h3> <p>The <code>pluton</code> data frame has 45 rows and 4 columns, containing percentages of isotopic composition of 45 Plutonium batches. </p> <h3>Usage</h3> <pre>data(pluton)</pre> <h3>Format</h3> <p>This data frame contains the following columns: </p> <dl> <dt>Pu238</dt><dd><p>the percentages of <i>(238)Pu</i>, always less than 2 percent.</p> </dd> <dt>Pu239</dt><dd><p>the percentages of <i>(239)Pu</i>, typically between 60 and 80 percent (from neutron capture of Uranium, <i>(238)U</i>).</p> </dd> <dt>Pu240</dt><dd><p>percentage of the plutonium 240 isotope.</p> </dd> <dt>Pu241</dt><dd><p>percentage of the plutonium 241 isotope.</p> </dd> </dl> <h3>Details</h3> <p>Note that the percentage of plutonium~242 can be computed from the other four percentages, see the examples. </p> <p>In the reference below it is explained why it is very desirable to combine these plutonium patches in three groups of similar size. </p> <h3>Source</h3> <p>Available as ‘<span class="file">pluton.dat</span>’ from the archive of the University of Antwerpen, ‘<span class="file">..../datasets/clusplot-examples.tar.gz</span>’, no longer available. </p> <h3>References</h3> <p>Rousseeuw, P.J. and Kaufman, L and Trauwaert, E. (1996) Fuzzy clustering using scatter matrices, <em>Computational Statistics and Data Analysis</em> <b>23</b>(1), 135–151. </p> <h3>Examples</h3> <pre> data(pluton) hist(apply(pluton,1,sum), col = "gray") # between 94% and 100% pu5 <- pluton pu5$Pu242 <- 100 - apply(pluton,1,sum) # the remaining isotope. pairs(pu5) </pre> <hr /><div style="text-align: center;">[Package <em>cluster</em> version 2.0.8 <a href="00Index.html">Index</a>]</div> </body></html>