I'm trying to plot a dendrogram object which is created using "as.dendogram" function. It works fine however I can not change the yaxis limits of the plot. tree<-as.dendrogram(hclust(as.dist(dissim),method="single")) plot(tree,ylim=range(0,20)) Error in plot.default(0, xlim = xlim, ylim = ylim, type = "n", xlab xlab, : formal argument "ylim" matched by multiple actual arguments This is imporatant for getting a consistant scale for different trees plotted side by side your help is very much appreciated Karim