\name{simpleEllipse}
\alias{simpleEllipse}
\title{Hotelling's T^2 Ellipse}
\usage{simpleEllipse(x, y, alfa=0.95, len=200)}
\description{Get a confidence ellipse for uncorrelated bivariate data}
\details{As described in 'Introduction to multi and megavariate data analysis
using PCA and
PLS' by Eriksson et al. This produces very similar ellipse as
compared to the ellipse function the ellipse package except that
this function assumes that and y are uncorrelated (which they of
are if they are scores or loadings from a PCA).}
\seealso{ellipse}
\author{Henning Redestig}
\value{A matrix with X and Y coordinates for the circle}
\arguments{\item{x}{first variable}
\item{y}{second variable}
\item{alfa}{confidence level of the circle}
\item{len}{Number of points in the circle}}