Kamila Naxerova wrote: > > Is there a way to plot elliptical shapes? symbols() > only provides circles... > Elipse centered at (x0, y0) with axes _a_ and _b_:
theta <- seq(0, 2 * pi, length=(big enough)) x <- x0 + a * cos(theta) y <- y0 + b * sin(theta) plot(x, y, type = "l") :-) Or, if you want to rotate it alpha degrees from the x-axis: x <- x0 + a * cos(theta) * cos(alpha) - b * sin(theta) * sin(alpha) y <- y0 + a * cos(theta) * sin(alpha) + b * sin(theta) * cos(alpha) Of course, the above formulas can be rewritten without the products of trig functions, but this way it's obvious what it's doing. Alberto Monteiro ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
