Try this :
>it<-seq(0,2*pi, l=100)
>xt<-r*cos(it)
>yt<-r*sin(it)
>points(xt,yt,type="l",col="blue")
a circle of radium r is define by
xt=r*cos(t)
yt=r*sin(t)
Justin BEM
Elève Ingénieur Statisticien Economiste
BP 294 Yaoundé.
Tél (00237)9597295.
----- Message d'origine ----
De : Xiaomei Ma <[EMAIL PROTECTED]>
À : R-help@stat.math.ethz.ch
Envoyé le : Mardi, 7 Novembre 2006, 6h11mn 27s
Objet : [R] Draw a circle with a given radius in an existing map
I have drawn a map in which the X and Y axes are latitude and
longitude. Now I need to draw one circle on the map - the center is a
point with specific latitude and longitude, but the challenge is that
the radius is in miles. Is there a way to do this? I'd very much
appreciate your response.
XM
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