similar to: hook for when R quits

R-helpers: What would be the absolute fastest way to make a large "empty" file (e.g. filled with all zeroes) on disk, given a byte size and a given number number of empty values. I know I can use writeBin, but the "object" in this case may be far too large to store in main memory. I'm asking because I'm going to use this file in conjunction with mmap to do parallel

Hi, it seems that the package hooks .onLoad and its C++ pendant R_unload_mylib are actually not called when R quits, but only when explicitly calling detach('package:mylib', unload = TRUE). Maybe this is platform specific, I'm on Ubuntu 13.10 - R 3.0.2 (see below). * is there a mechanism that a package can use to effectively do some cleanup on standard exit, such as calling

Hello, I have a package with a namespace. Because I use Roxygen that overwrites the NAMESPACE file each time it is run, I use a R/zzz.R file with an .onLoad() and .onUnload() functions to take care of loading and unloading my shared library. The problem: if I load my library from a local directory, then the unloading of the package fails, e.g: # loads fine >library(Foo,

If one wants to unload compiled code for a package containing a namespace, my understanding is that .onUnload() should be used, with a call to library.dynam.unload(). This is used in e.g., the stats and methods packages, but it appears to me that the compiled code is not being unloaded when the package is detached(). Am I misunderstanding something? Best, Jim > search() [1]

R-devel, I am interested in creating a package that requires non-GPL'd (commercial) C code to work. In essence it is a single .c file with no use of R headers (all .C callable functions). For example's sake: 1 #include <stdio.h> 2 3 void test (int *a) { 4 *a = 101; 5 } The package isn't destined for CRAN, and I realize that this isn't R-legal, but looking for

I've noticed that many of the "base" R packages have an .onUnload() function which automatically unloads compiled shared libraries with library.dynam.unload(). For example: > stats:::.onUnload function (libpath) library.dynam.unload("stats", libpath) <bytecode: 0x1033b9c30> <environment: namespace:stats> I've noticed that many other packages don't

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/

Happy 2013, Day 2. I can't seem to figure out why parent.frame() works differently depending on whether it is a formal/default argument or a passed argument. ##### code: basic setup #### tmp <- tempfile() A <- 101 save(A,file=tmp);rm(A) # these work as expected, loading into the parent of the call load() load(tmp);str(A);rm(A) load(tmp, parent.frame());str(A);rm(A) load(tmp,

Hello, I'm trying to access an object, given only its name as a symbol. I cannot figure out how to proceed. Suppose I call substitute( ) on the expression 'x + 2': > parse.tree <- substitute(x + 2); The constituents of parse.tree are of type symbol and numeric: > str(parse.tree[[1]]) symbol + > str(parse.tree[[2]]) symbol x > str(parse.tree[[3]]) num 2 Suppose

i know RCurl pakage to retrieve web content,it has limited use, i want interactive package like (in perl--->Mechanize, In java--->Watij,Prowser,HTMLunit,HTTPunit, in Ruby---->Watir ,etc) this modules/packages opens appropriate browser,which can create queries,retrieves output, clicks buttons, fill up form automatically,searches keyword in search engine, Downloads many items from

I have a package that I'm developing that I need to unload the library. Long story short I figured out that the leaving the compiled code loaded lead to a segmentation fault, but unloading the code will fix it. I've read the documentation and it appears that there are several ways to do this? What is the popper accepted current standard for unloading compiled code? The options as I

To me it seems like writeBin() writes one char/byte more than expected. > con <- file("testbin", "wb") > writeBin("ttccggaa", con) > close(con) > con <- file("testbin", "rb") > readBin(con, what="character") [1] "ttccggaa" > seek(con, what=NA) [1] 9 > close(con) > con <-

My purpose in mentioning the Julia language (julialang.org) here is not to start a flame war. I find it to be a very interesting development and others who read this list may want to read about it too. It is still very much early days for this language - about the same stage as R was in 1995 or 1996 when only a few people knew about it - but Julia holds much potential. There is a thread about

I was wondering if it was possible in Prototype/Scriptaculous to run an effect when a link is clicked, then go to that page, or if it was possible to have an effect run when the page unloads. I have tried <body onunload="new Effect.Fade("whatever");> and some prototype page exit events, could get a alert("") function to work, but not the effects. Any ideas?

The survival package has a firstlib.R file that I had forgotton and just reviewed. After deleting several bits which had a use 10 years ago during my Splus to R transition, the only thing remaining is .onUnload <- function(libpath) library.dynam.unload("survival", libpath) Does this bit of code still serve a purpose? Can I toss it? Terry T.

for the moment, I'm using: .onAttach <- function(libname, pkgname) { .bbg.db.conn <<- dbConnect(dbDriver("PostgreSQL"), user="blah","blah") } .onUnload <- function(libpath) { dbDisconnect(.bbg.db.conn) } which results in a hidden global variable in the global environment. I would prefer to make the assignment only in the package namespace.

R> seq(as.Date(Sys.Date()), by="-1 months", length=6) [1] "2012-01-31" "2011-12-31" "2011-12-01" "2011-10-31" "2011-10-01" "2011-08-31" R> Notice how October appears twice. Now, date arithmetic is gruesome but the documentation for seq.Date et al does not hint it wouldn't honour the by= argument. So a bug, or

Hi, Have I missed something, or misunderstood? The r-help posting guide asks users to contact the package maintainer : "If the question relates to a contributed package, e.g., one downloaded from CRAN, try contacting the package maintainer first. [snip] ONLY [only is bold font] send such questions to R-help or R-devel if you get no reply or need further assistance. This applies to both

Dear all, In R-devel (2011-09-23 r57050), I'm running into a serious problem with seek()ing on connections opened with gzfile(). A warning is generated and the file position does not seek to the requested location. It doesn't seem to occur all the time - I tried to create a small example file to illustrate it, but the problem didn't occur. However, it can be seen with a file I use for

I am trying to build the OggImport component using Xcode 3.0. Since I am a fan of frameworks, I have the XIPHQT_USE_FRAMEWORKS define set. Anyhow, I am getting a link error as listed below. Ld /Users/jeff/programming/xiph-qt/OggImport/build/Development/ OggImport.component/Contents/MacOS/OggImport normal i386 cd /Users/jeff/programming/xiph-qt/OggImport /Developer/usr/bin/gcc-4.0