Message-Id: <3.0.5.32.19980327093817.009053a0@biocem.univ-bpclermont.fr> Date: Fri, 27 Mar 1998 09:38:17 +0100 To: r-help <r-help@stat.math.ethz.ch> From: zk@biocem.univ-bpclermont.fr (Zivan Karaman) Subject: R-beta: image S vs. R compatibility Hello! First of all I would like to thank very much Guido Masarotto for the latest Win32 version of R. I've installed it painlessly on WinNT 4 Workstation, and it is loading and running fast. The only problems I've had thus far are demos 6 to 8 ("recursion", "scoping", and "is.things"), which cause a memory protection fault. I've a question regarding the image function, which I use frequently and for various purposes. Apparently, the S and the R version of the image function don't behave the same way. I've attached below a function that under S produces chessboard-like figures, while it produces irregular pattern with R (never mind different colours in R and S, this is not a point). Does anybody know how can one obtain the chessboard images (squares or rectangles of the same size) with R? Best regards Zivan test.image <- function(n) { if(n < 2) stop("n must be >= 2") pause <- function(msg = "Press <ENTER> to continue...") { cat(msg) readline() invisible() } for(i in 2:n) { i1 <- i + 1 i2 <- i * i image(x = 1:i1, y = 1:i1, z = matrix( 1:i2, ncol = i)) pause() } invisible() } Zivan Karaman Limagrain Genetics Research, B.P. 115, 63203 Riom Cedex, France Tel: +33 (0) 473 634 343 Fax: +33 (0) 473 634 345 E-mail: zivan.karaman@biocem.univ-bpclermont.fr -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help 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-help-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._