similar to: Passing an R matrix to a C program

Hi, I'm quite knew in R, so I might not have the R specific jargon. But here is my problem, I'm trying to access and use variabels given by a function environment, more specifically the rho in do_optim in src/main/optim.c According to the documentation http://cran.r-project.org/doc/manuals/R-ints.html#The-_0027data_0027 the envsxp is defined as a tagged pairlist. "ENVSXP: Pointers

On Tue, Jul 26, 2011 at 11:35 AM, Taral <taralx at gmail.com> wrote: > > One piece of code I'm writing has a lot of intermediates, and I'm > trying to optimize down the number of memory accesses. Here's a > snippet from the start of the function, where I think there is some > low-hanging fruit: > > # BB#0: >        pushq   %rbp >        pushq   %r15

One piece of code I'm writing has a lot of intermediates, and I'm trying to optimize down the number of memory accesses. Here's a snippet from the start of the function, where I think there is some low-hanging fruit: # BB#0: pushq %rbp pushq %r15 pushq %r14 pushq %r13 pushq %r12 pushq %rbx movq %rdx, %rcx movq %rdi, -16(%rsp) # 8-byte Spill movq (%rsi), %rdi movq

I'm trying to export an R (1.4.0 on linux) matrix to python (+Pyclimate) via a binary file. The problem is that while R writes by columns, python reads by rows. For a 2D matrix, there is no problem: writeBin writes vectors, so writeBin(t(x)[1:length(x)],...) works fine. But the objects I want to export are 3D arrays (slice rasters of lat,lon for each time t). One way is to use a loop over

Hi! I'm upgrading to 1.6.2. (linux suse7.3). I see that there is a patch in R-release.diff.gz. 1. Is this patch stable? In other words, is it adviced that I install R-release.diff.gz ? 2. When I do: zcat R-release.diff.gz | patch -p1 -E I get many lines such as: patching file AUTHORS Reversed (or previously applied) patch detected! Assume -R? [n] Should I just accept the default

HI, I would like to extract the variance components estimation in lme function like a.fit<-lme(distance~age, data=aaa, random=~day/subject) There should be three variances \sigma_day, \sigma_{day %in% subject } and \sigma_e. I can extract the \sigma_e using something like a.fit$var. However, I cannot manage to extract the first two variance components. I can only see the results in

Hi. This is not a question, I had the following problem and I want to share my solution. ------- I tried to create a new virtual machine with this command: $ virt-install --connect qemu:///system -n vmTeste -r 512 -f /var/lib/libvirt/images/vmTeste.qcow2 -s 2 -c /media/Data/isos/debian-506-amd64-netinst.iso --vnc --noautoconsole --accelerate --hvm And I got this error: ERROR Unable to

I am currently puzzled by a passage in the R Extensions manual, section 5.10: SEXP lapply(SEXP list, SEXP expr, SEXP rho) { R_len_t i, n = length(list); SEXP ans; if(!isNewList(list)) error("`list' must be a list"); if(!isEnvironment(rho)) error("`rho' should be an environment"); PROTECT(ans = allocVector(VECSXP, n));

Hi, I'm using rsync for a couple of things but I am at a point where I could not find a solution for my problem. this is what I want to do: rsync only the files i_* from a directory from machine A to machine Bi and delete them from machine B if they on longer exist on machine A. so I use the command: rsync -azv --stats -e ssh --delete i_* user@host:/dir/ When using this command the files

Dear R-dev, I would like to accelerate my R computation by using parallel OpenMP compilers (e.g from Pathscale) on a 2-processor AMD server and I would like to know whether R is a tread safe library. The main kernel of the OpenMP parallelization is a C SEXP function that performs the computational routine in parallel with: ******************* SEXP example(SEXP list, SEXP expr, SEXP rho) {

Dear [R] people Could you please help with following data transformation. Any suggestions, hints, references and even guessing on performing any of the following steps are highly appreciated. Those transformations are crucial for my work. (n_, _n, j_, k_ signify numbers) SOURCE DATA: id cycle1 cycle2 cycle3 ? cycle_n 1 c c c c 1 m m m m 1 f f f f 2 m m m NA 2 f f f NA 2 c c c NA 3 a a

Dear all As far as I could trace, looking at the function C function numeric_deriv, this unwanted behavior comes from the inner most loop in, at the very end of the function, for(i = 0, start = 0; i < LENGTH(theta); i++) { for(j = 0; j < LENGTH(VECTOR_ELT(pars, i)); j++, start += LENGTH(ans)) { SEXP ans_del; double origPar, xx, delta; origPar = REAL(VECTOR_ELT(pars, i))[j];

Greetings, I would like to estimate a spectral coherence between two timeseries. The stats : spectrum() returns a coh matrix which estimates coherence (squared). A basic test which from which i expect near-zero coherence: x = rnorm(500) y = rnorm(500) xts = ts(x, frequency = 10) yts = ts(y, frequency = 10) gxy = spectrum( cbind( xts, yts ) ) plot( gxy $ freq, gxy $

Hello, I'm evaluating this expression expression({ for(x in 1:5){ .Call('rh_status','x') }}) a million times from a program with R embedded in it. I have attached reproducible code that crashes with Program received signal SIGSEGV, Segmentation fault. 0x00002b499ca40a6e in R_gc_internal (size_needed=0) at memory.c:1309 1309 FORWARD_NODE(R_PPStack[i]); Current language:

On Mon, Mar 3, 2014 at 12:26 AM, Chris Lattner <sabre at nondot.org> wrote: > > On Mar 2, 2014, at 8:53 PM, Renato Golin <renato.golin at linaro.org> wrote: > > > On 3 March 2014 12:32, Pete Cooper <peter_cooper at apple.com> wrote: > >> Would those work with a foreach construct? Perhaps I forgot to mention > that was what I'm trying to work out

This is a consolidated reply to your four most recent emails. > I am trying to leverage reposurgeon to automate the process of finding merge > points, and I seem to be spinning my wheels. Can you provide an example of how > you are searching for merges? Not a working one, yet. That code is buggy. It's my next thing to work on. >reposurgeon% merge (apcsmart-dev)

Thanks for the answers on readme.packages. I have installed Rw1031 from SetupR.exe including the option for compiling source files and, following directions in www.stats.ox.ac.ul/pub/Rtools, have installed: -tools.zip -Perl (Active Perl) -mingw-1.1.tar.gz -copied sh.exe to c:\bin\sh.exe After Perl installation, its directory is added to my path. I have also added the directory where the R

I've just implemented a generalization of R's text connections, to also support reading/writing raw binary data. There is very little new code to speak of. For input connections, I wrote code to populate the old text connection buffer from a raw vector, and provided a new raw_read() method. For output connections, I wrote a raw_write() to append to a raw vector. On input, the mode

Hello, I try to write an extension in C, to get a faster functions. Therefore I have to add an element (vector) to a vector. The command in R is very simple: x = c(x,a) But in C I have the problem to reallocate my vector for getting more space. Everything I tried, I get a "Segmentation fault". So, how can I combine two vectors in C and give the result back to R (return(x))? Thanks

Hi All, I was reading the R extension manual section 5.11 ( Evaluating R expression from C) and I tried to build a simple call to the sum function. Please see below. call_to_sum <- inline::cfunction( language = "C", sig = c(x = "SEXP"), body = " SEXP e = PROTECT(lang2(install(\"sum\"), x)); SEXP ans = PROTECT(eval(e, R_GlobalEnv)); UNPROTECT(2); return