similar to: Non-recursive way to remove empty directory on Windows?

I'd vote for it to stay. It could of course suprise someone who'd expect c(list(a=1), b=2, use.names = FALSE) to generate list(a=1, b=2, use.names=FALSE). On the upside, is the performance gain from using use.names=FALSE. Below benchmarks show that the combining of the names attributes themselves takes ~20-25 times longer than the combining of the integers themselves. Also, at no

This may have been asked before, but is there an elegant way to check whether an variable/argument passed to a function is a "parse tree" for an (unevaluated) expression or not, *without* evaluating it if not? Currently, I do various rather ad hoc eval()+substitute() tricks for this that most likely only work under certain circumstances. Ideally, I'm looking for a isParseTree()

I was looking at the CRAN package 'bfork-0.1.2', which exposes the Unix fork() and waitpid() calls at the R code level, and noticed that the help file example for bfork::fork removes R's temporary directory, the value of tempdir(). I think it happens because the forked process shares the value of tempdir() with the parent process and removes it when it exits. This seems like a

On a related note, the storage mode should try to match ans[[1]] (or unlist:ed and) when allocating 'ansmat' to avoid coercion and hence a full copy. Henrik On Jan 26, 2017 07:50, "William Dunlap via R-devel" <r-devel at r-project.org> wrote: It would be cool if the default for tapply's init.value could be FUN(X[0]), so it would be 0 for FUN=sum or FUN=length, TRUE

On Fri, Jan 27, 2017 at 12:34 AM, Martin Maechler <maechler at stat.math.ethz.ch> wrote: > > > On Jan 26, 2017 07:50, "William Dunlap via R-devel" <r-devel at r-project.org> > > wrote: > > > It would be cool if the default for tapply's init.value could be > > FUN(X[0]), so it would be 0 for FUN=sum or FUN=length, TRUE for >

Thanks Bill and Michael for taking the time to share your knowledge! As a further background to my question, here are two examples that I forgot to include in my original post (reminded by Michael's answer). I swapped the i and j arguments in `[.data.frame` and `[<-.data.frame`. With warnings, but else without (?) problem. Using Bill's data: `[.data.frame`(x = d, i = 1, j = 2) # [1]

>From comments in http://stackoverflow.com/questions/24815572/why-does-function-c-accept-an-undocumented-argument/24815653 : The code of c() and unlist() was formerly shared but has been (long time passing) separated. From July 30, 1998, is where do_c got split into do_c and do_unlist. With the implementation of 'c.Date' in R devel r71350, an argument named 'use.names' is

>>>>> Henrik Bengtsson <henrik.bengtsson at gmail.com> >>>>> on Sat, 24 Sep 2016 11:31:49 -0700 writes: > Martin, did you post your code for withAutoprint() anywhere? > Building withAutoprint() on top of source() definitely makes sense, > unless, as Bill says, source() itself could provide the same feature. I was really mainly asking

Dear all, I have some csv-files (originating from Excel-files) containing empty cells. In my example file I have four variables of different classes, each with some empty cells in the original csv-file: > test <- read.csv2("test.csv", dec=".") > test id id2 x y 1 a 1 NA 2 b e NA 2.2 3 f 3 3.3 4 c g 4 4.4 > class(test$id) [1]

FYI, in R devel (to become 3.5.0), there's isFALSE() which will cut some corners compared to identical(): > microbenchmark::microbenchmark(identical(FALSE, FALSE), isFALSE(FALSE)) Unit: nanoseconds expr min lq mean median uq max neval identical(FALSE, FALSE) 984 1138 1694.13 1218.0 1337.5 13584 100 isFALSE(FALSE) 713 761 1133.53 809.5 871.5

I'm sure this exists elsewhere, but, as a trade-off, could you achieve what you want with a separate helper function F(expr) that constructs the function you want to pass to [lsv]apply()? Something that would allow you to write: sapply(split(mtcars, mtcars$cyl), F(summary(lm(mpg ~ wt,.))$r.squared)) Such an F() function would apply elsewhere too. /Henrik On Thu, Apr 16, 2020 at 9:30 AM

tl;dr: Why are named arguments discouraged in `[.data.frame`, `[<-.data.frame` and `[[.data.frame`? (because this question is of the kind 'why is R designed like this?', I though R-devel would be more appropriate than R-help) ############################# Background: Now and then students presents there fancy functions like this:

Hi, I'd like to spawn of a new R process from within R using system(), e.g. system("R -f myScript.R"). However, just specifying "R" as in that example is not guaranteed to work, because "R" may not be on the OS's search path. What is the best way, from within a running R, to infer the command (basename or full path) for launching R in way that it works on

In S-PLUS 3.4 help on 'c' (http://www.uni-muenster.de/ZIV.BennoSueselbeck/s-html/helpfiles/c.html), there is no 'use.names' argument. Because 'c' is a generic function, I don't think that changing formal arguments is good. In R devel r71344, 'use.names' is not an argument of functions 'c.Date', 'c.POSIXct' and 'c.difftime'. Could

>>>>> Henrik Bengtsson <henrik.bengtsson at gmail.com> >>>>> on Tue, 13 Mar 2018 10:12:55 -0700 writes: > FYI, in R devel (to become 3.5.0), there's isFALSE() which will cut > some corners compared to identical(): > > microbenchmark::microbenchmark(identical(FALSE, FALSE), isFALSE(FALSE)) > Unit: nanoseconds > expr

Hello, I'm writing a program that takes a tree in input (nested lists) and returns a copy of it replacing the leaves with something else (eg: a computation done on the original leaves). In the example below, the tree is composed by countries and cities, and the leaves (children of the cities) are vectors of numbers. The program takes this tree and replaces the vectors at the bottom by their

Wikipedia claims that C ints are still only guaranteed to be at least 16 bits, and longs are at least 32 bits. So no, R's integers are long. -pd > On 16 Jun 2017, at 20:20 , William Dunlap via R-devel <r-devel at r-project.org> wrote: > > But R "integers" are C "ints", as opposed to S "integers", which are C > "long ints". (I

Yeah, that was what I heard from our instructor when I was a graduate student: L stands for Long (integer). Regards, Yihui -- https://yihui.name On Fri, Jun 16, 2017 at 11:00 AM, Serguei Sokol <sokol at insa-toulouse.fr> wrote: > Le 16/06/2017 ? 17:54, Henrik Bengtsson a ?crit : >> >> I'm just curious (no complaints), what was the reason for choosing the >> letter

client: samba-client-4.7.4-0.fc27.x86_64 client: samba-client-4.6.5-0.fc26.x86_64 server: samba-4.7.3-3.fc27.x86_64 Reproduce steps: [chris at f27h ~]$ smbclient //f27s.local/scratch/ Enter SAMBA\chris's password: Try "help" to get a list of possible commands. smb: \> cd noperms smb: \noperms\> ls . D 0 Wed Jan 3 12:00:27 2018

Hi, is it possible to have non-Sweave vignettes(*) in inst/doc/ be listed under 'Downloads' on CRAN package pages? For instance, in my R.rsp package I have a inst/doc/report.pdf (part of the source *.tar.gz) that is not detected/listed. The PDF is not based on a Sweave vignette but an *.tex.rsp vignette that is dynamically created via inst/doc/Makefile. It is listed (*) BTW, can the