Displaying 20 results from an estimated 4000 matches similar to: "level of mutability for the type of a SEXP"
2020 Sep 06
8
some questions about R internal SEXP types
Hello,
I am writing an R/Go interoperability tool[1] that work similarly to
Rcpp; the tool takes packages written in Go and performs the necessary
Go type analysis to wrap the Go code with C and R shims that allow the
Go code to then be called from R. The system is largely complete (with
the exception of having a clean approach to handling generalised
attributes in the easy case[2] - the less
2001 Dec 07
2
Memory problem
Dear all,
I have written a little R program to convert images. See below. Within the
loop over j (the filenames) memory consumption grows constantly. rm( ... )
inside the loop did not help. Memory does not grow if I remove the writeBin
statements between the two #-------- marks. But obviously this is not
solution I want...
Thanks for any advice.
Manfred Baumstark
P.S. As I'm new to R:
2003 Dec 16
1
Memory issues in "aggregate" (PR#5829)
Full_Name: Ed Borasky
Version: 1.8.1
OS: Windows XP Professional
Submission from: (NULL) (208.252.96.195)
R 1.8.1 seems to be running into a memory allocation problem in the "aggregate"
function. I have a rather large dataset (14 columns by 223,000 rows -- almost 40
megabytes) and a script that performs some processing on it. The system is a 768
MB Pentium 4. Here's the console
2009 Dec 16
2
What is the fastest way to see what are in an RData file?
Currently, I load the RData file then ls() and str(). But loading the file
takes too long if the file is big. Most of the time, I only interested what
the variables are in the the file and the attributes of the variables (like
if it is a data.frame, matrix, what are the colnames/rownames, etc.)
I'm wondering if there is any facility in R to help me avoid loading the
whole file.
2002 Oct 14
1
R 1.6.0 Solaris crash with xmalloc: out of virtual memory
[some de-capitalization of *SXP done manually by mailing
list maintainer ; the originally was caught as potential spam. MM]
I have a little R program that crashes with the message
xmalloc: out of virtual memory
The code has a repeat{} loop that watches the sizes of some files.
When there's an increase it updates things by reading the last 65
lines of each file, doing some
2011 Aug 13
1
Latent flaw in SEXPREC definition
There seems to be a latent flaw in the definition of struct SEXPREC
in Rinternals.h, which likely doesn't cause problems now, but could
if the relative sizes of data types changes.
The SEXPREC structure contains a union that includes a primsxp,
symsxp, etc, but not a vecsxp. However, in allocVector in memory.c,
zero-length vectors are allocated using allocSExpNonCons, which
appears to
2009 Jul 09
1
bug in seq_along
Using the IRanges package from Bioconductor and somewhat recent R-2.9.1.
ov = IRanges(1:3, 4:6)
length(ov) # 3
seq(along = ov) # 1 2 3 as wanted
seq_along(ov) # 1!
I had expected that the last line would yield 1:3. My guess is that
somehow seq_along don't utilize that ov is an S4 class with a length
method.
The last line of the *Details* section of ?seq has a typeo. Currently
it is
2017 Mar 29
2
Transferring ownership of R-managed buffer
http://www.keittlab.org/
On Wed, Mar 29, 2017 at 1:04 PM, Herv? Pag?s <hpages at fredhutch.org> wrote:
> Hi Tim,
>
> On 03/29/2017 08:24 AM, Tim Keitt wrote:
>
>> I have a use case where I would like to create an SEXP around an existing
>> buffer that is managed by R, thus avoiding a copy operation.
>>
>
> What to you mean exactly by "an existing
2017 Mar 29
3
Transferring ownership of R-managed buffer
I have a use case where I would like to create an SEXP around an existing
buffer that is managed by R, thus avoiding a copy operation. If I have
something like:
void *p = (void*) RAW(PROTECT(Rf_allocVector(RAWSXP, n)));
... additional maniupulation ...
SEXP x = somefunc(SXPTYPE, n, p); // ????
Is there a "placement" constructor available? (I have arranged for the
corresponding
2000 May 30
2
Documentatio: typo in Writing R Extensions (PR#557)
Full_Name: stephen eglen
Version: 1.0.0
OS: Unix (OSF/1)
Submission from: (NULL) (129.215.238.26)
Hi,
in the documentation `Writing R Extensions', the section 3.6.1 (handling the
effects of garbage collection) has the following typo:
Protecting a SEXP pointer protexts ...
Should that be `protects'?
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
2005 Jan 03
2
Memory problem ... Again
Happy new year to all;
A few days ago, I posted similar problem. At that time, I found out that our
R program had been 32-bit compiled, not 64-bit compiled. So the R program
has been re-installed in 64-bit and run the same job, reading in 150
Affymetrix U133A v2 CEL files and perform dChip processing. However, the
memory problem happened again. Since the amount of physical memory is 64GB,
I think
2008 Apr 05
2
Adding a Matrix Exponentiation Operator
Hi all
I recently started to write a matrix exponentiation operator for R (by
adding a new operator definition to names.c, and adding the following code
to arrays.c). It is not finished yet, but I would like to solicit some
comments, as there are a few areas of R's internals that I am still feeling
my way around.
Firstly:
1) Would there be interest in adding a new operator %^% that performs
2011 Jan 20
1
Calling C++ from R
Hi All,
I am new to this area and use Rcpp to call C++ from R and try to build the
package under Windows 7. I use Rtools and R 2.10.1 32bit. Everything works
fine with me, except using R functions like "rnorm" or "runif" in the C++
code. When I use "R CMD check" the package, it always return error
** libs
making DLL ...
g++
2018 May 08
2
unlist errors on a nested list of empty lists
On 08/05/2018 2:58 PM, Duncan Murdoch wrote:
> On 08/05/2018 1:48 PM, Steven Nydick wrote:
>> Reproducible example:
>>
>> x <- list(list(list(), list()))
>> unlist(x)
>>
>> *> Error in as.character.factor(x) : malformed factor*
>
> The error comes from the line
>
> structure(res, levels = lv, names = nm, class = "factor")
>
2013 Mar 01
1
.Call interface: Use R SEXP as C mutable *char
Dear R Developers,
DISCLAIMER: I am new to package development in R and new to this list.
I am trying to do something along the lines of:
SEXP test_fun (SEXP filename) {
const char *inputfile = translateChar(STRING_ELT(filename, 0));
int abc = some_function(inputfile);
...
}
The code compiles fine, but I get a warning:
"passing argument of 'some_function' discards qualifiers
2004 Dec 28
2
Configuration of memory usage
Hi, all;
I know there has been a lot of discussions on memory usage in R.
However, I have some odd situation here. Basically, I have a rare
opportunity to run R in a system with 64GB memory without any limit on
memory usage for any person or process. However, I encountered the memory
problem error message like this:
Error: cannot allocate vector of size 594075 Kb
I got this error message while
2009 Jan 05
1
can't get names of R_env
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
2012 May 03
1
Setting up a windows system for rcpp
I am running into a wall getting my system to work with rcpp and inline.
Following Dirk's advice on stackoverflow, I hope someone is able to help
me.
My steps were to install MinGW 32 bit first, then installing Rtools, I
disabled MinGW's entry in the PATH.
I am trying to get the following code to work:
library(Rcpp)
library(inline)
body <- '
NumericVector xx(x);
return wrap(
2004 Feb 17
2
interfacing C++ using .Call
Hi folks,
I apologise if this is in the documentation somewhere, but I can't
seem to find it. I also did a search of CRAN without any success. I'm
using R-1.8.1 (pre-compiled) on Windows 2000 with Rtools and mingw 2.0.0
(which includes gcc/g++ 3.2).
I'm trying to link some C++ code from another application to R using the
.Call interface and am experiencing some problems. I was
2010 Aug 21
1
Speed improvement to evalList
I've been inspired to look at the R source code by some strange timing
results that I wrote about on my blog at radfordneal.wordpress.com
(see the posts on "Speeding up parentheses..." and "Two surprising
things...".
I discovered that the strange speed advantage of curly brackets over
parentheses is partially explained by an inefficiency in the evalList
and