similar to: Data frame printing buglet when multiple empty column names

>>>>> Hadley Wickham <h.wickham at gmail.com> >>>>> on Tue, 1 Mar 2016 09:12:00 -0600 writes: > This is admittedly minor, and you shouldn't have repeated names in a > data frame anyway, but: > df <- data.frame(1:3, 1:3, 1:3) > # Ok > setNames(df, c("x", "y", "")) > # Not ok

Hi all, Is it possible to determine the environment in which a promise will be evaluated? e.g. f <- function(code) { force(code) } f({ a <- 1 b <- 2 }) Is there any way to tell from within f that a and b will be created in the global environment? Thanks, Hadley -- http://had.co.nz/

How can I suppress this warning? > options(warn = -10) > list(1,2,3,) Warning: a final empty element has been omitted the part of the args list of 'list' being evaluated was: (1, 2, 3, ) [[1]] [1] 1 [[2]] [1] 2 [[3]] [1] 3 > suppressWarnings(list(1,)) Warning: a final empty element has been omitted the part of the args list of 'list' being evaluated was: (1, )

Is there really a need for these complications? Packages emitting this warning are broken by definition and should be fixed. Perhaps we could "flip the switch" in a test environment and see how much havoc is wreaked and whether authors are sufficiently responsive? Michael On Sat, Mar 4, 2017 at 12:04 PM, Martin Maechler <maechler at stat.math.ethz.ch > wrote: >

What do you prefer/recommend for double-banger function names: 1 scale.colour 2 scale_colour 3 scaleColour 1 is more R-like, but conflicts with S3. 2 is a modern version of number 1, but not many packages use it. Number 3 is more java-like. (I like number 2 best) Any suggestions? Thanks, Hadley

Just stating, in 'ifelse', 'test' is not recycled. As I said in "R-intro: length of 'ifelse' result" (https://stat.ethz.ch/pipermail/r-devel/2016-September/073136.html), ifelse(condition, a, b) returns a vector of the length of 'condition', even if 'a' or 'b' is longer. On current 'ifelse' code in R: * The part ans[nas] <- NA

Hi all, I think there's a small buglet in quote: str(quote()) # Error in quote() : 0 arguments passed to 'quote' which requires 1 str(quote(expr = )) # symbol I bring this up because this seems like the most natural way of capturing the "missing" symbol with pure R code, compared to substitute() or bquote() or formals(plot)$x Hadley -- Chief Scientist, RStudio

On Fri, Aug 12, 2016 at 11:31 AM, Hadley Wickham <h.wickham at gmail.com> wrote: >> >> One possibility would also be to consider a "numbers-only" or >> >> rather "same type"-only {e.g., would also work for characters} >> >> version. >> >> > I don't know what you mean by these. >> >> In the

Recently I reported a small bug in optim's SANN method failing to report that it had exceeded the maximum function evaluation limit in the convergence code. This is a small enough matter that I was reluctant to create a full-blown bug report. Indeed in the optimx package Ravi Varadhan and I have been developing on r-forge (under the OptimizeR project) it was a minimal work around to fix

Hi all, Why is the object size of an empty vector 40 bytes? (At least in 64-bit R.) object.size(integer(0)) # 40 bytes Reading R internals, it looks like it should be: * 4 bytes: sxpinfo header (= 32 bits) * 8 bytes: pointer to attributes * 8 bytes: pointer to next node * 8 bytes: pointer to previous node * 4 bytes: length * 4 bytes: true length = 36 bytes Where are the extra 4 bytes coming

All, Martin: Thanks for this and all the other things you are doing to both drive R forward and engage more with the community about things like this. Apologies for missing this discussion the first time it came around and if anything here has already been brought up, but I wonder what exactly you mean when you want recycling behavior. Specifically, based on an unrelated discussion with Henrik

Is there anything that actually requires R core members to manually do significant amounts of work here? IIUC, you can do a CRAN run to detect the broken packages, and a simple script can collect the emails of the affected maintainers, so you can send a single email to them all. If authors don't respond by fixing their packages, then those packages should be archived, since there's high

Hi all, all.equal is generally very useful when you want to find the differences between two objects. It breaks down however, when you have two long strings to compare: > all.equal(a, b) [1] "1 string mismatch" Does any one know of any good text diffing tools implemented in R? Thanks, Hadley -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice

e.g. substitute(f(x), list(f = function(x) x + 1)) # function (x) # x + 1(x) An extra pair of parentheses would really help: (function(x) x + 1)(x) (Better indenting etc would be nice, but not necessary for correct understand of the code) Hadley -- Chief Scientist, RStudio http://had.co.nz/

Hi all, Would someone mind pointing to me to the inspiration for the use of the L suffix to mean "integer"? This is obviously hard to google for, and the R language definition (https://cran.r-project.org/doc/manuals/r-release/R-lang.html#Constants) is silent. Hadley -- http://hadley.nz

I am trying to run the following code in R on a Linux cluster. I would like to use the full processing power (specifying cores/nodes/memory). The code essentially runs predictions based on a GAM regression and saves the results as a CSV file for multiple sets of data (here I only show two). Is it possible to run this code using HPC packages such as Rmpi/snow/doParallel? Thank you!

Hi all, Is there a better to way to subset the ROWs (in the sense of NROW) of an vector, matrix, data frame or array than this? subset_ROW <- function(x, i) { nd <- length(dim(x)) if (nd <= 1L) { x[i] } else { dims <- rep(list(quote(expr = )), nd - 1L) do.call(`[`, c(list(quote(x), quote(i)), dims, list(drop = FALSE))) } } subset_ROW(1:10, 4:6) #> [1] 4 5 6

Hi all, Is there any chance that readRDS and saveRDS might one day become read.rds and write.rds? That would make them more consistent with the other reading and writing functions. Hadley -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/

> On Jun 8, 2018, at 1:49 PM, Hadley Wickham <h.wickham at gmail.com> wrote: > > Hmmm, yes, there must be some special case in the C code to avoid > recycling a length-1 logical vector: Here is a version that (I think) handles Herve's issue of arrays having one or more 0 dimensions. subset_ROW <- function(x,i) { dims <- dim(x) index_list <-

Hi all, Is there a fast way to determine the number of lines in a file? I'm looking for something like count.lines analogous to count.fields. Hadley -- http://had.co.nz/