I am still an avid user of R base plotting and fortunately so are a lot of the interesting packages I use. However, to this day, I am still annoyed by the fact that many functions do not support the "add" parameter. In many cases, this is caused by xy.plot not supporting it (because the parameter is typically passed on to it through .) It also requires lots of code constructs like for(i in 1:10) { if(i==1) { plot(x,y[i,]) } else { points(x,y[i,]) } } Now, I can understand that generally supporting add can have some unexpected consequences in some cases (e.g. xlim and ylim should be ignored in these cases), but I cannot imagine these truly to be worse than not supporting it. Is there (still) a reason why this not supported and/or do people find this as troublesome as I do? Nick Sabbe -- ping: nick.sabbe@ugent.be link: <http://biomath.ugent.be/> http://biomath.ugent.be wink: A1.056, Coupure Links 653, 9000 Gent ring: 09/264.59.36 -- Do Not Disapprove [[alternative HTML version deleted]]