Date: Sat, 29 Mar 1997 13:39:44 +1030 Message-Id: <9703290309.AA24871@attunga.stats.adelaide.edu.au> From: Bill Venables <wvenable@attunga.stats.adelaide.edu.au> To: r-testers@stat.math.ethz.ch Subject: R-alpha: some minor inconsistencies While transferring some old S-code I came across some minor inconsistencies between R and S that are probably more nuisance value than they would take to fix. I report them here for reference, (but not in any campaigning mood, of course...) 1. No frame() command in R and so no graceful way to clear a plotting screen. (Or is there?) 2. There is a dev.off() function, but no other dev.xxx functions. (The dev.xxx group are S-PLUS and not vanilla S, by the way.) There is no graphics.off() function. 3. If dfr is a data frame with components "x", "y" and some others then points(dfr) uses dfr as an xy-list in S but not in R. If there is some non-numeric component it actually fails in R. This may be S being a bit inconsistent, but the behaviour is different. 4. The plotting marks are a bit gappy in R and even the ones that are there do not correspond to their S counterparts. Here is a little function to make a wall chart showing the gaps: show.marks <- function() { if(!exists(".Device") || is.null(.Device)) x11() plot(1, type="n", axes=F, xlab="", ylab="") oldpar <- par() par(usr = c(-0.01, 5.01, -0.01, 5.01), pty = "s") for(i in 0:18) { x <- 1/2 + (i %% 5) y <- 4.5 - (1/2 + (i %/% 5)) points(x + 1/5, y - 1/5, pch = i, cex = 3) text(x - 1/5, y + 1/5, i, adj = 0.5, cex = 1.5) } abline(h = 1:5 - 0.5, lty = 1) segments(0:5, rep(0.5, 5), 0:5, rep(4.5, 5)) par(oldpar) invisible() } 5. In S you may extend a list by assigning to a new component. For example if lis has components "x" and "y", only, you can extend it by assigning to lis$z, lis["z"] or lis[, "z] (the last if it is also a data frame). In R only the first of these works; the others give a "subscript out of bounds" error. (This may have been discussed while I was not paying attention, in which case I apologize.) Bill Venables. -- Bill Venables, Head, Dept of Statistics, Tel.: +61 8 8303 5418 University of Adelaide, Fax.: +61 8 8303 3696 South AUSTRALIA. 5005. Email: Bill.Venables@adelaide.edu.au =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- r-testers mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-testers-request@stat.math.ethz.ch =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-