plotellipse function

Plot Ellipse

Plots an ellipse with percentage tolerance and a certain location and covariance.

plotellipse(x.loc, x.cov, perc = 0.98, col = NULL, lty = NULL)

Arguments

• x.loc: the location vector
• x.cov: the covariance
• perc: defines the percentage and should be a (vector of) number(s) between 0 and 1
• col, lty: graphical parameters

Details

First the radius of the covariance is calculated and then the ellipses for the provided percentages are plotted at the certain location.

Returns

Plot with ellipse.

References

C. Reimann, P. Filzmoser, R.G. Garrett, and R. Dutter: Statistical Data Analysis Explained. Applied Environmental Statistics with R. John Wiley and Sons, Chichester, 2008.

Author(s)

Peter Filzmoser <P.Filzmoser@tuwien.ac.at > http://cstat.tuwien.ac.at/filz/

Examples

data(moss)
Ba=log10(moss[,"Ba"])
Ca=log10(moss[,"Ca"])
plot.new()
plot.window(xlim=range(Ba),ylim=c(min(Ca)-1,max(Ca)))

x=cbind(Ba,Ca)
plotellipse(apply(x,2,mean),cov(x),perc=c(0.5,0.75,0.9,0.98))