This is because R keeps track of the names of an object, until there are 2
names. Thus, once it reaches 2, it can no longer decrement the named count.
In this example, 'a' reaches 2 names ('a' and 'b'), thus R does not know
that 'a' only has one name at the end.
Luke has added reference counting t
wrapper <- function(){
Sys.setenv(TMP="A")
print(Sys.getenv("TMP"))
.C("c_fun")
}
As the example above, I hope to set an env var $TMP inside the R function
"wrapper", which affects the functionality of the C function call "c_fun".
Also the print line shows that $TMP is set to be "A", but t
What does c_fun look like? Here's mine:
#include
#include
void c_fun(){
printf("TMP is %s\n", getenv("TMP"));
}
and I then do this at the shell prompt:
R CMD SHLIB c_fun.c
and this at the R prompt:
dyn.load("c_fun.so")
wrapper()
and I get:
> wrapper()
[1] "A"
TMP is A
list()
Is that
I suspect the intend is to send a value from R to compiled code. Which
happens to be a problem for which Rcpp offers a pretty convenient solution.
And if you really, really want to, you can even program in C inside of an
Rcpp interface:
R> cppFunction("int foo(std::string txt) { Rprintf(\"Var
Thank you, Ben.
Best,
Ravi
-Original Message-
From: r-devel-boun...@r-project.org [mailto:r-devel-boun...@r-project.org] On
Behalf Of Ben Bolker
Sent: Monday, June 02, 2014 8:07 PM
To: r-de...@stat.math.ethz.ch
Subject: Re: [Rd] A bug in princomp(), perhaps?
Ben Bolker gmail.com> wri
Perhaps, adding Gavin's work around for a dataframe with missing values might
also be useful to the documentation:
princomp(na.omit(x))
Thanks,
Ravi
-Original Message-
From: r-devel-boun...@r-project.org [mailto:r-devel-boun...@r-project.org] On
Behalf Of Ben Bolker
Sent: Monday, June
I'm building a simple R extension around a CUDA-enabled dynamic library, and
I want to run the whole package with cuda-memcheck for debugging purposes. I
can run it just fine with Valgrind:
$ R --no-save -d valgrind < test.R
However, if I try the same thing with cuda-memcheck,
$ R --no-save -d c
Dear Michael,
thank you for the enlightenment. Just for the records, here is the
solution that Michael referred to:
http://developer.r-project.org/Refcnt.html
Best,
Denes
On 06/03/2014 03:57 PM, Michael Lawrence wrote:
This is because R keeps track of the names of an object, until there
