similar to: Memory address of character datatype

Hi, Given the following R code: library(pryr) data <- array(dim = c(5)) for(x in 1:5) { data[x] <- as.integer(x * 2) } add = address(data) # save address of "data" for(x in 1:5) { data[x] <- as.integer(0) } if (add == address(data)) { print("Address did not change") }

Hi David, ? Thanks for the correction concerning the "else" issue. ? Taking your code and removing some lines (to increase readability): ? library(pryr) ? data <- array(dim = c(5)) for(x in 1:5) { ?? data[x] <- as.integer(x * 2) } ? #print(data) ? add = address(data) for(x in 1:5) { ?? data[x] <- as.integer(0) } ? if (add == address(data)) { print("Address did not

If you were curious about the hidden details of the memory layout in R, the best reference is the source code. In your example, you are not getting to your string because there is one more pointer in the way, "x" is a vector of strings, each string is represented by a pointer. At C level, there is an API for getting an address of the value, e.g. INTEGER(x) or CHAR(STRING_ELT(x)). At

Hi, ? I would like to know if the Garbage Collector (GC) changes the address of a variable in R. In other words, assuming the following code: ? ??? ? library(pryr) ? ? ??? x <- 1:1024 ? ??? ? addr <- address(x)? # save address of variable "x" in "addr" ??????? ? . ?? ????? ? . ???? ??? ? . ????? (execution of operations that create/destroy many small/big

On 3/27/20 15:19, Hadley Wickham wrote: > > > On Fri, Mar 27, 2020 at 4:01 PM Herv? Pag?s <hpages at fredhutch.org > <mailto:hpages at fredhutch.org>> wrote: > > > > On 3/27/20 12:00, Hadley Wickham wrote: > > > > > > On Fri, Mar 27, 2020 at 10:39 AM Herv? Pag?s > <hpages at fredhutch.org <mailto:hpages at

> On Nov 12, 2017, at 8:47 AM, lille stor <lille.stor at gmx.com> wrote: > > Hi, > > Given the following R code: > > library(pryr) > > data <- array(dim = c(5)) > > for(x in 1:5) > { > data[x] <- as.integer(x * 2) > } > > add = address(data) # save address of "data" > > for(x in

Hello, I would like for my C function to be able to manipulate some values stored in an R data frame. To achieve this, a need the (real) memory address where the R data frame stores its data (hopefully in a contiguous way). Then, from R, I call the C function and passing this memory address as a parameter. The question: how can we get the memory address of the R data frame? Thank you! L.

On 3/27/20 12:00, Hadley Wickham wrote: > > > On Fri, Mar 27, 2020 at 10:39 AM Herv? Pag?s <hpages at fredhutch.org > <mailto:hpages at fredhutch.org>> wrote: > > Hi Tomas, > > On 3/27/20 07:01, Tomas Kalibera wrote: > > they provide an over-approximation > > They can also provide an "under-approximation" (to say the

Hi, ? I am trying to build R using Visual Studio 2010 but without success. My question is if it possible build?R with this compiler anyway? ? If not, could someone please tell how to link one's C code against both the static and shared libraries of R for Windows (that comes from the official website found here https://cran.r-project.org/mirrors.html)? ? Thank you!

Hello from Bioconductor, I'm developing a package to share R objects across clusters using boost library. The concept is similar to mmap package: https://cran.r-project.org/web/packages/mmap/index.html . However, I have a problem when I was trying to write Dataptr_method for the alternative string. Based on my understanding, the return value of the Dataptr_method function should be a vector

Hi Gabriel, Thanks for your explanation, I totally understand that it is almost impossible to change the data structure of STRSXP. However, what I'm proposing is not about changing the internal representation, but rather about how we design and use the ALTREP API. I might do not state the workarounds clearly as English is not my first language. Please let me explain them again in detail.

Dear all, I have a question about R's modification in place and replacement functions. I was working through Hadley Wickham's Advanced R section on Replacement Functions and in a file (say test.R) I wrote: `second<-` <- function(x, value) { x[2] <- value x } x <- 1:10 second(x) <- 5L print(x) library(pryr) x <- 1:10 print(address(x)) second(x) <- 6L

On 1/9/20 06:56, Stepan wrote: > On 09. 01. 20 15:41, lille stor wrote: > >> I believe this could be done without creating side effects (e.g. >> crash) as we are just talking about changing values. A crash would certainly be an annoying "side effect" ;-) As Stepan explained, data.frame objects like most objects in R should never be modified in-place. If you're

In this email to the R-help list: https://stat.ethz.ch/pipermail/r-help/2017-June/447474.html and in this question on Stackoverflow: https://stackoverflow.com/questions/44486643/nleqslv-memory-use-in-r Andrew Leach has raised a question about the memory usage of my package nleqslv. In a model with a loop within a function he has experienced continuously increasing memory usage by package nleqslv

hi guys, i use clang to compile a program with datatype uint, but i get errors saying " use of undeclared identifier 'uint'; did you mean 'int'? ". it really doesn't support it? if true, how can i add a datatype? -- View this message in context: http://llvm.1065342.n5.nabble.com/donot-support-uint-datatype-tp52523.html Sent from the LLVM - Dev mailing list archive

Does anyone have any links to example code showing how to use the MySQL SET datatype in my ActiveRecord objects. -- Posted via http://www.ruby-forum.com/.

Hi all, This is my first post to the forum, and I''ll point out right away that I''m a noob to everything, Ruby, Rails, MySQL, etc., so I expect that I''m wrong here, but is the ''year'' datatype missing from ActiveRecord in 2.0.2? According to my MySQL 5.0 reference manual, ''year'' is a datatype, but when I try to run a migration that has

Hi Chen, On Tue, Dec 11, 2012 at 04:37:20PM -0800, Dong Chen wrote: > hi guys, > i use clang to compile a program with datatype uint, but i get errors saying > " use of undeclared identifier 'uint'; did you mean 'int'? ". > > it really doesn't support it? if true, how can i add a datatype? clang related question should go to cfe-dev at cs.uiuc.edu

How can I use an interval datatype inside migrations ? execute ? TIA, ngw -- Nicholas Wieland nicholas_wieland@yahoo.it -------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060815/1c262694/attachment.html

hi Wei-Ren, i got it, i have to add a "typedef int uint;" that's not a big problem thank you -- View this message in context: http://llvm.1065342.n5.nabble.com/donot-support-uint-datatype-tp52523p52528.html Sent from the LLVM - Dev mailing list archive at Nabble.com.