Hi Michael, You need to specify both 'box' and 'axes' to FALSE to avoid the box lines (if you don't specify the latter one, there will still be axes lines).
Best, Yihui -- Yihui Xie <[EMAIL PROTECTED]> Phone: +86-(0)10-82509086 Fax: +86-(0)10-82509086 Mobile: +86-15810805877 Homepage: http://www.yihui.name School of Statistics, Room 1037, Mingde Main Building, Renmin University of China, Beijing, 100872, China On Wed, Sep 17, 2008 at 8:34 PM, Michael Friendly <[EMAIL PROTECTED]> wrote: > Hi > I'm trying to make a 3d plot showing a point cloud, the corresponding data > ellipse > and the principal axes of the ellipse as vectors. > > library(rgl) > data(trees) > cov <- cov(trees) > mu <- mean(trees) > > plot3d(trees, type="s", size=0.5, col="blue", cex=2) > > In this step, an extra box is added. I've tried using box=FALSE, but it has > no effect. > # how to avoid the extra box? > plot3d( ellipse3d(cov, centre=mu, level=0.68), col="pink", alpha=0.2, add = > TRUE) > > Here's what I've tried to plot the principal axes in variable space, using > the result of prcomp(). > But I've got something wrong, because, although they are at right angles, > they don't > align with the ellipse. > > PC <- princomp(trees) > sdev <- PC$sdev # component standard deviations > sd <- sqrt(diag(cov)) # variable standard deviations > > # vectors in variable space of principal components > vec <- matrix(mu,3,3, byrow=TRUE) + diag(sd) %*% PC$loadings > > for (j in 1:3) { > mat <- rbind(mu, vec[j,]) > segments3d(mat, col="red") > } > > Can someone help? > > thanks, > -Michael > > > -- > Michael Friendly Email: friendly AT yorku DOT ca Professor, Psychology > Dept. > York University Voice: 416 736-5115 x66249 Fax: 416 736-5814 > 4700 Keele Street http://www.math.yorku.ca/SCS/friendly.html > Toronto, ONT M3J 1P3 CANADA > ______________________________________________ R-help@r-project.org 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.
