similar to: Undefined behavior of head() and tail() with n = 0

In addition, signed zeroes only exist for floating point numbers - the bit patterns for as.integer(0) and as.integer(-0) are identical. Bill Dunlap TIBCO Software wdunlap tibco.com On Thu, Jan 26, 2017 at 1:53 AM, Martin Maechler <maechler at stat.math.ethz.ch> wrote: >>>>>> Florent Angly <florent.angly at gmail.com> >>>>>> on Wed, 25 Jan 2017

>>>>> Florent Angly <florent.angly at gmail.com> >>>>> on Wed, 25 Jan 2017 16:31:45 +0100 writes: > Hi all, > The documentation for head() and tail() describes the behavior of > these generic functions when n is strictly positive (n > 0) and > strictly negative (n < 0). How these functions work when given a zero >

Martin, I agree with you that +0 and -0 should generally be treated as equal, and R does a fine job in this respect. The Wikipedia article on signed zero (https://en.wikipedia.org/wiki/Signed_zero) echoes this view but also highlights that +0 and -0 can be treated differently in particular situations, including their interpretation as mathematical limits (as in the 1/-0 case). Indeed, the main

Hi all, I believe there is an issue with passing NULL to the function I(). class(NULL) # "NULL" (as expected) print(NULL) # NULL (as expected) is.null(NULL) # TRUE (as expected) According to the documentation I() should return a copy of its input with class "AsIs" preprended: class(I(NULL)) # "AsIs" (as expected) print(I(NULL)) # list() (not expected!

Hi all, I have noticed incorrect parsing of very small hexadecimal numbers like "0x1.00000000d0000p-987". Such a hexadecimal representation can can be produced by sprintf() using the %a flag. The return value is incorrectly reported as 0 when coercing these numbers to double using as.double()/as.numeric(), as illustrated in the three examples below:

>>>>> Florent Angly <florent.angly at gmail.com> >>>>> on Tue, 20 Dec 2016 13:42:37 +0100 writes: > Hi all, > I believe there is an issue with passing NULL to the function I(). > class(NULL) # "NULL" (as expected) > print(NULL) # NULL (as expected) > is.null(NULL) # TRUE (as expected) > According

Dear All, to my surprise as.factor does not accept a levels argument. Maybe I did not read the documentation well enough. See the example below. I wanted to use ch1 as factor in the newdata argument of survfit, so I assumed that I could write as.factor(ch1, levels=ch1), since the order should be kept. But as.factor(ch1, levels=ch1) results in the error: Error in as.factor(ch1, levels = ch1)

Dear R users & developers, I coming across the following issue since R 2.15.2 32-bit (running on Windows XP 32.bit; some output left out for conciseness): > setInternet2(TRUE) > require(rJava) > .jinit() > getCRANmirrors() > system("ls" , intern = TRUE) Error in system("ls", intern = TRUE) : CreateThread failed My details are as follows: >

Dear All, since years I am struggling with Surv objects in data.frames. The following seems to have to do with it. See below the modified example from the help page of survSplit. The original works, as expected. If, however, a Surv object is added to the data.frame, each record gets doubled. Is there some solution other than avoiding Surv objects in data.frames? Thanks, Heinz

Dear All The "R CMD check" on the "zoo" (1.7-11) package results in an error on my environment. It can be reduced to the following example: ---------------------------------------------------- > require(zoo) > read.zoo(system.file("doc", "demo1.txt", package = "zoo"), sep = "|", format="%d %b %Y") Error in

Dear All, reposting, because I did not find a solution, maybe someone could check the example below. It's taken from the help page of survdiff. Executing it, gives the error "Error in floor(temp) : Non-numeric argument to mathematical function" best regards, Heinz library(survival) ## Example from help page of survdiff ## Expected survival for heart transplant patients based

Hi, I am trying to use the gettext() function to translate some text. I have never used this function before, so, it's entirely possible that I am doing something wrong. The issue that I am encountering is that gettext() properly translates some text, but not some other. Natural language was compiled in my R (installed from the Debian repositories): $ R R version 2.15.1 (2012-06-22) --

Hi, I am trying to use the gettext() function to translate some text. I have never used this function before, so, it's entirely possible that I am doing something wrong. The issue that I am encountering is that gettext() properly translates some text, but not some other. Natural language was compiled in my R (installed from the Debian repositories): $ R R version 2.15.1 (2012-06-22) --

Hi, I run a script file by dropping it on a windows batch file that runs R in --slave modus. In a subfunction there is the call to file.choose(). The problem is, that the dialog does show only folders but no files at all. It's quite strange: a) without --slave modus the files are shown, b) when I copy the whole script file in a different file it was also ok, but when I renamed the script, the

When executing 'dyn.load("this/dll/does/not/exist.dll")' the resulting error message is scrambled. Not all characters will be displayed and when I select the empty region text disappears/reappears. For a screenshot see: http://dl.dropbox.com/u/2602516/dyn.load_error1.PNG and http://dl.dropbox.com/u/2602516/dyn.load_error2.PNG. Note: I had the same problem with xlsReadWrite

I've tried building it on a server that I know has pretty much every library possible for a program to need, but I'm still not getting a good samba install. I'm on white-dwarf linux (kernel 2.4.25), gcc 3.3.2, Samba 3.0.2a White-dwarf is home-grown, very much like slackware. When I configure and make and make install, I don't get any errors, but I when I look for some files

On 9/24/20 8:53 AM, Aur?lien Aptel wrote: > Ken Bass via samba <samba at lists.samba.org> writes: >> I installed a new Ubuntu 20.4 LTS system (smbd 4.11.6) . Initially I >> tried using the SSSD and 'realm' to join the domain. Everything worked >> similar to my Centos 7 install and I thought I was finished. >> >> The one thing not working is? cifs

Last week, we've talked here about "xtabs(), factors and NAs", -> https://stat.ethz.ch/pipermail/r-devel/2017-January/073621.html In the mean time, I've spent several hours on the issue and also committed changes to R-devel "in two iterations". In the case there is a *Left* hand side part to xtabs() formula, see the help page example using 'esoph', it

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

summary: The function 'by' inconsistently strips class from the data to which it is applied. quick reason: tapply strips class when simplify is set to TRUE (the default) due to the class stripping behaviour of unlist. quick answer: This can be fixed by invoking tapply with simplify=FALSE, or changing tapply to use do.call(c instead of unlist executable example: