You probably won't be able to do that without modifying plot.svm(). It calls filled.contour() like this:
filled.contour(xr, yr, matrix(as.numeric(preds), nr = length(xr), byrow = TRUE), plot.axes = { axis(1) axis(2) colors <- as.numeric(model.response(model.frame(x, data))) points(formula, data = data[-x$index, ], col = colors[-x$index]) points(formula, data = data[x$index, ], pch = "x", col = colors[x$index]) }, levels = 1:(length(unique(as.numeric(preds))) + 1), key.axes = axis(4, 1:length(unique(as.numeric(preds))) + 0.5, labels = levels(preds)[unique(preds)], las = 3), plot.title = title(main = "SVM classification plot", xlab = names(lis)[2], ylab = names(lis)[1]), ...) Note the elaborate `plot.axes=' argument. You can try add another argument to plot.svm, which takes an plotting expression, then plug that expression to the end of the `plot.axes=' expression shown above. [Note to David: There's a typo in ?plot.svm (spelling for `vector').] HTH, Andy > From: [EMAIL PROTECTED] > > Dear all, > > I'm not able to solve easily the following simple problem. > I really hope someone can give me some hints. > > I trained an svm (e1071). Now I'd like to show the results > graphically. > I used plot.svm and I'd like to add some other objects to the plot: > points, (coloured) ellipses to indicate some intersting > regions, curves, > and so on... > I tried to pass these as additional graphics parameters to pass to > filled.contour, as indicated in ?plot.svm and in examples in > filled.contour help. > > But it doesn't seem to work. > > Where is my foult? Can anyone help me? > > Best, > Alessandro > > > PS: I use R 1.9.0 on a WinXP OS > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Alessandro Ambrosi, Ph.D. | > Oncological Surgical Sc. Dept. | mail: [EMAIL PROTECTED] > Surg. Cl. II | [EMAIL PROTECTED] > University of Padua | fax: +39 049 651891 > via Giustiniani, 2 | tel: +39 049 8212055 > I-35128 Padua (ITALY) | url: > www.stat.unipd.it/~ambrosi > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > ------------------------------------------------- > This mail sent through IMP: webmail.unipd.it > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html