Nothing
ellipse <- function(mu, sigma, alpha=.05, npoints=250,
newplot=FALSE, draw=TRUE, ...) {
es <- eigen(sigma)
e1 <- es$vec%*%diag(sqrt(es$val))
r1 <- sqrt(qchisq(1-alpha,2))
theta <- seq(0,2*pi,len=npoints)
v1 <- cbind(r1*cos(theta),r1*sin(theta))
pts=t(mu-(e1%*%t(v1)))
if (newplot && draw) {
plot(pts, ...)
} else if (!newplot && draw) {
lines(pts, ...)
}
invisible(pts)
}
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