R help - Sep 2009 - Concentration ellipsoid

Hi all,

Can anyone please guide me how to draw a Concentration ellipsoid for a
bivariate system with a bivariate normal dist. having a VCV matrix : 

Sigma <- matrix(c(1,2,2,5), 2, 2)

I would like to draw in using GGPLOT. Your help will be highly appreciated.

Thanks,
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In the mean time, i have found one package "ellipse" to do the same.
The
syntax is :

plot(ellipse(Sigma), type='l')

However I am still struggling on how to use "qplot" (in GGPLOT2) to
draw
above plot. I want to get some stylish view for my presentation preparation.
Any help please?

Thanks,



RON70 wrote:
> 
> Hi all,
> 
> Can anyone please guide me how to draw a Concentration ellipsoid for a
> bivariate system with a bivariate normal dist. having a VCV matrix : 
> 
> Sigma <- matrix(c(1,2,2,5), 2, 2)
> 
> I would like to draw in using GGPLOT. Your help will be highly
> appreciated.
> 
> Thanks,
> 
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