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Folks: In answer to a query, Andy Liaw recently submitted some code to construct a block diagonal matrix. For what seemed a fairly straightforward task, the code seemed a little "overweight" to me (that's an American stock analyst's term, btw), so I came up with a slightly cleaner version (with help from Andy): bdiag<-function(...){ mlist<-list(...) ## handle case in

Please read this first: http://www.perceptualedge.com/articles/visual_business_intelligence/dual-scaled_axes.pdf It's a reasoned discussion of why it's a bad idea and proposes some alternative methods. Another good article is: K. W. Haemer. Double scales are dangerous. The American Statistician, 2(3):24?24, 1948. People have been advising dual-axis plots for (at least) 60 years! Hadley