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Could someone come up with R code to plot an ellipse from the eigenvalues and the eigenvectors of the following matrix

$\begin{equation*} \mathbf{A} = \left( \begin{array} {cc} 2.2 & 0.4\\ 0.4 & 2.8 \end{array} \right) \end{equation*}$

Thanks

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closed as off topic by joriki, Ross Millikan, t.b., Qiaochu Yuan Apr 23 '11 at 20:15

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I voted to close as off-topic and migrate to stats.SE -- I think a request for code in a specific programming language for a task whose mathematical aspects are well-known is outside the scope of this site. @MYaseen208: Please don't view this as an action against you; I think the question will be better placed on that site. –  joriki Apr 23 '11 at 9:22
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@joriki: MYaseen208 asked it there first –  Henry Apr 23 '11 at 12:34
    
I see. In that case, it would have been appropriate to mention that this is a cross-post and to provide the link. There seem to be two answers there already, so people are wasting their time here thinking this is an unanswered question. –  joriki Apr 23 '11 at 12:58

1 Answer 1

up vote 1 down vote accepted

You might want to play with something like

library(ellipse)
plot(ellipse(array(c(2.2, 0.4, 0.4, 2.8) , dim=c(2,2) ) ) , type="l" )

Ellipse

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