Hmmm, could you explain this a bit? You want to add a circle to a plot? See the examples in help(symbols)
Or you want to calculate the coordinates of the points on a circle? t <- seq(0,2*pi,length=100) coords <- t(rbind( 10+sin(t)*2, 20+cos(t)*2)) plot(coords) Here (10,20) is the center of the circle, and 2 is its radius. If you set length to a bigger number you'll get smoother resolution. A points (x,y) is inside the circle if (c1-x)^2+(c2-y)^2 < r^2 (c1, c2) is the center of the circle, r is its radius. Gabor On Sat, Apr 22, 2006 at 01:42:46PM -0400, Jian Zhang wrote: > how to draw a circle (e.g. radius=10cm) of one point? > And how to choose these points in the circle? > Thanks! > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- Csardi Gabor <[EMAIL PROTECTED]> MTA RMKI, ELTE TTK ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
