Hi Johannes, plot(X,Y,type="n") creates an empty plot with correct dimensions, ind<-!(Xb==Xa) points(X[ind],Y[ind]) plots points for zero-length intervals only, and gray() can be used for shading lines, as in segments(Xa,Y,Xb,Y,col=gray(.9*(Xb-Xa)/max(Xb-Xa))) #the longest interval will be gray(.9) so it is just visible
hth. Am 15.08.2011 18:01, schrieb Johannes Radinger: > Hello, > > I've a question concerning the display of interval data. > > A sample dataset where X is an interval between Xa and Xb > which should be displayed: > > Y=c(15,14,23,18,19,9,19,13) > Xa=c(17,22,21,18,19,25,8,19) > Xb=c(22,22,29,34,19,26,17,22) > X = (Xa+Xb)/2 > > > It's easily possible to plot the mean of the interval like: > plot(X,Y) > > afterwards I can create lines for the interval with: > segments(Xa,Y,Xb,Y) > > I think that explains roughly what I'd like to do. > > Now some questions: > > 1) How can I display the segments only? without the points? > > 2) I'd like only to have points where the range (Xa-Xb) = 0, because > otherwise nothing would be displayed in such cases. > > 3) How can I color (grey scale) the interval-segments according to their > range? > Lets say the wider the range (Xa-Xb) the brighter (the more white)and the > narrower the darker (more black)? > > 4) Is there a special R-package or function besides for plotting interval, or > ranging data? > > Thanks > > /johannes > > > > -- > > ______________________________________________ > [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 > and provide commented, minimal, self-contained, reproducible code. -- Eik Vettorazzi Institut für Medizinische Biometrie und Epidemiologie Universitätsklinikum Hamburg-Eppendorf Martinistr. 52 20246 Hamburg T ++49/40/7410-58243 F ++49/40/7410-57790 ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
