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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