Thank you, Dr. Meyer. I updated the e1071 package but still can't find the other three arguments for plot.svm. In addition, I can plot a gray-colored contour region by adding the argument "col = c(gray(0.2), gray(0.8))". But I failed to change those colored "x" or "o" points into the shapes I want. Basically, I don't want to have any color in the plot. Could you give me a hint how to do that?
The code I am using to plot the gray-contour figure is: m <- svm(****, data = mydata) plot(m, mydata, col = c(gray(0.2), gray(0.8))) Thank you very much and Merry Xmas. Frank On Fri, 17 Dec 2004 18:46:07 +0100, David Meyer <[EMAIL PROTECTED]> wrote: > Frank: > > > Dear R people, > > > I am trying to plot the results from running svm in library(e1071). I > > use plot.svm. After searching through the help archives and FAQ, I > > still have several questions: > > > 1. In default, crosses indicate support vectors. But why are there > > two colors of crosses? What do they represent? > > The colors represent the classes of the data points. The help page > admittedly doesn't tell you this and deserves improvement. > > > 2. I want to draw a white-gray colored plot and modify the different > > colored crosses or circles by different shaped points. Could anyone > > give me a hint? > > I just added three arguments to plot.svm() that allow customizing of the > plot symbols. The contour region is controlled by the parameters of the > filled.contour() function used in plot.svm(), so you will need to add > the color.palette argument to plot.svm (which subsequently will be > passed to filled.contour()). > > > 3. Is it possible for me to draw a "hyperplane" on the plot? > > You can add arbitrary objects to the plot (try lines()); but plot.svm() > doesn't compute the boundaries. > > > 4. What is the algorithm to plot the contour region? > > see filled.contour(). The input is determined by a grid of predicted > values. > > Best, > -d > > > Thank you very much, > > > Frank > > -- > Dr. David Meyer > Department of Information Systems > > Vienna University of Economics and Business Administration > Augasse 2-6, A-1090 Wien, Austria, Europe > Fax: +43-1-313 36x746 > Tel: +43-1-313 36x4393 > HP: http://wi.wu-wien.ac.at/~meyer/ > ______________________________________________ [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
