Jie TANG <totangjie <at> gmail.com> writes:

>

> hi ,R user folks .

>

> Nowadays I read a paper which draw a probability ellipse circle figure

> shown in the appendix.

> I wonder how to draw this figure by R ?

> the x-axis and y-axis both express the error but in different direction .

Your question is quite vague, but perhaps you might start with the

ellipse package. Also try

RSiteSearch("ellipse")

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