similar to: .Alias and memory

I would like to suggest a slight modification to diag(). In the case where x is a matrix with both row names and column names the same, it would be reasonable if the resulting vector also had those names. I often use diag() on variance matrices, where this modification is helpful. The modification requires replacing if (is.matrix(x) && nargs() == 1) return(c(x)[1 +

Hi Everyone, Can I suggest a couple of new `codes' methods. I know codes is a bit dodgy (at least, according to the comments in codes.factor), but for what it's worth I like to extract codes from data frames of factors, for which the following two functions (which operate recursively) are helpful: "codes.default" <- function(x) { if (is.list(x)) lapply(x, codes)

I'm not sure exactly where to point my finger with this one, but there is a nasty surprise to the unsuspecting user. There is no check on the length of the vector passed in the pch= argument to plot, it is just recycled as necessary: plot(1:10,1:10,pch=1:2) gives alternating circles and triangles. The nasty bits come up especially with plot.formula: x<-1:10;y<-1:10

>>>>> "JonR" == Jonathan Rougier <J.C.Rougier@durham.ac.uk> writes: JonR> ... By the way, I have `solve' JonR> methods for triangular matrices and variance matrices -- would JonR> you be interested? { Jonathan, I hope it's okay if I CC this to R-devel; this must be of a wider interest } Ye.e..s; for triangular ones,

I've just started digging into Andreas's old report: > a <- array(0,c(2,2,2)); > dimnames(a)<-list(hansi=1:2, pepi=c("a","b"), karli=3:4) > dimnames(a[,,1]) # losing component names [[1]] [1] "1" "2" [[2]] [1] "a" "b" Now, this would be fairly easily fixed (I think) which would also make it compatible with S3.

I note that the CRAN at .at land still refers to 0.63.2. Is this just a typo? I don't want to download a whole lot only to find I still have it! Does 0.63.3 live elsewhere? And I note the new function kronecker - very useful but can it be applied to non-numerics as in factors, data frames etc preserving the class, levels and names? John

I note that the CRAN at .at land still refers to 0.63.2. Is this just a typo? I don't want to download a whole lot only to find I still have it! Does 0.63.3 live elsewhere? And I note the new function kronecker - very useful but can it be applied to non-numerics as in factors, data frames etc preserving the class, levels and names? John

I want the indices i for which x[i] < 0 (say): > x <- c(1, -1, 3, 3, -2) > where.negative(x) [1] 2 5 Surely where.negative is something simple, but how? G?ran -------------------------------------------------------------- G?ran Brostr?m Department of Statistics tel: +46 90 786-5223 Ume? University fax: +46 90 786-6614 S-90187 Ume?, Sweden

I wonder if it isn't time to change the reply-to-list policy of R-help and adopt the alternative convention of replying to the author and asking him/her to summarize to the list. Recently R-help has been too busy for me to keep up with. There were quite a few identical responses in the "Finding indices with a certain property" thread, rather than an extended discussion. I think

Hi everyone I'm trying to generate a vector of the form a <- c(1,2,3,4,1,2,3,1,2,1) where n = 5 in a general way, where n can be any positive integer. I've run out of ideas. Does anyone have any suggestions? Thanks Karen Karen Kotschy Centre for Water in the Environment University of the Witwatersrand Johannesburg Tel: 011 716-2218

Hi everyone I'm trying to generate a vector of the form a <- c(1,2,3,4,1,2,3,1,2,1) where n = 5 in a general way, where n can be any positive integer. I've run out of ideas. Does anyone have any suggestions? Thanks Karen Karen Kotschy Centre for Water in the Environment University of the Witwatersrand Johannesburg Tel: 011 716-2218

I think we are long overdue for a revision of the header files used in R. This is going to be especially important for a clean build of the CORBA and R/Java stuff which I have been looking over Duncan's shoulder at. It will also let us integrate some of the features Duncan has had to find creative ways around and also to let us integrate things like the PROBLEM buffer problem. I would propose

Dear R users, Does anyone have a function for putting a legend on an image plot? I couldn't locate an R equivalent of image.legend....has anyone written such a thing? kind regards andy --------------------------------------------------------------------- J. Andy Royle, U.S. Fish and Wildlife Service - Office of Migratory Bird Management; 11510 American Holly Drive , Laurel, MD

Hi everyone, Is there any reason why we should not automatically coerce a factor supplied as an argument to col in a plotting function? The following modification (to R-1.6.1) seems pretty harmless > plot.xy function (xy, type, pch = 1, lty = "solid", col = par("fg"), bg = NA, cex = 1, ...) { if (is.factor(col)) col <- codes(col)

Hi Everyone, At the moment it is not possible to replicate complex lists, but only simple ones: > rep(list(fred = 1:10), 10) # works fine > rep(list(fred = 1:10, happy = "squash"), 10) Error in rep(list(fred = 1:10, happy = "squash"), 10) : Unimplemented feature in rep There is nothing in ?rep that suggests that the latter should not work, and I think it would

I was surprised to find that the variance of a scalar, using var(), is NA. Surely this should be zero? Cheers, Jonathan. --please do not edit the information below-- Version: platform = sparc-sun-solaris2.7 arch = sparc os = solaris2.7 system = sparc, solaris2.7 status = Patched major = 0 minor = 99.0 year = 2000 month = February day = 9 language = R Search Path: .GlobalEnv,

I find this a bit puzzling ... > solve(matrix(c(5, 2, 3, 1), 2, 2), c(Inf, 3)) [1] NaN Inf > solve(matrix(c(5, 2, 3, 1), 2, 2)) %*% c(Inf, 3) [,1] [1,] -Inf [2,] Inf I would expect the answer to be c(-Inf, Inf), so why has the -Inf been replaced by NaN in solve? Cheers, Jonathan. --please do not edit the information below-- Version: platform = sparc-sun-solaris2.7 arch = sparc

Hi everyone, There is no mention in ?new.env (R-1.6.0) of what the effect of setting the hash argument of new.env() actually does. What does it mean in performance terms to say that "the environment will be hashed"? Thanks, Jonathan. -- Jonathan Rougier Science Laboratories Department of Mathematical Sciences South Road University of Durham

Just a minor point, but the adj argument in ?text is described wrongly (0.64.1). Perhaps the following might be added to the details. Values of 0, 0.5, and 1 specify left/top, middle and right/bottom, respectively. The default is for centred text, ie \code{adj = c(0.5, 0.5)}. Cheers, Jonathan. Jonathan Rougier Science Laboratories Department of

The following commands z <- matrix(seq(0, 1, len=1000)) image(z, 1, z, zlim=c(0, 1), col=gray(1:10/10)) appear to violate the image functionality as described on the help page. As I understand it, by specifying a zlim of c(0, 1) and a colour vector of length 10, the colours should correspond to the intervals (0, 0.1), (0.1, 0.2), ..., (0.9, 1.0), this being 10 equally-spaced intervals on (0,