I attempted to implement the call by reference example on page 200 of
Seamless R and C++, as follows:
#include
using namespace Rcpp;
// [[Rcpp::export]]
void absC(double & x) {
if (x < 0) x = -x;
}
/*** R
x = -1
absC(x)
x
*/
Unfortunately, x remains equal to -1.
Platforms: Windows 7, "R versi
mericVector is
> expected; hence a copying takes place.
>
> Regards
> Søren
>
>
>
>
> |-Original Message-
> |From: rcpp-devel-boun...@lists.r-forge.r-project.org [mailto:rcpp-devel-
> |boun...@lists.r-forge.r-project.org] On Behalf Of Dirk Eddelbuettel
> |
, which is why I am interested in utilizing C++, which supports call
by reference.
On Wed, Jul 29, 2015 at 12:37 PM, Dirk Eddelbuettel wrote:
>
> On 29 July 2015 at 07:29, Rguy wrote:
> | Thanks for the insight. For other readers possibly struggling with call
> by
> | reference, the
Can I access an R option from within an Rcpp function? I'd like the access
to happen at runtime, not at compile time. Something like this:
if (getOption("my_option") == x) {
do this;
} else {
do that;
}
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}
>
>
>
> /*** R
>
> foo()
>
> */
>
>
>
> > foo()
>
> [1] "7"
>
>
>
> - all though the result is here a character.
>
>
>
> Regards
>
> Søren
>
>
>
>
>
> *From:* rcpp-devel-boun...@lists.r-forge.r-project.or
What is correct way to represent NA in a template? I have been successfully
using NA_REAL (see example below) but I am not sure if this is the proper
method.
Thanks.
/* template_NA.cpp:
Experiment with use of NA in templates in Rcpp. Change first member of a
vector to NA.
*/
#include
using names
I would like to call a template function including the expression
T::get_na() with a matrix Column as the T. The toy program below
illustrates what I am trying to do.
Various error messages are generated by the compiler with, I think, the key
one being:
column_get_na.cpp:11:2: error: 'get_na' is
I find that when I attempt to export Rcpp functions to a cluster using the
R clusterExport function I get the following error (or some variant
thereof):
Error in checkForRemoteErrors(val) :
5 nodes produced errors; first error: NULL value passed as symbol address
I am running Windows 7, and the
In reading the names of a data frame in an Rcpp program I find that the
following both work:
CharacterVector nmz = dfr.names();
CharacterVector nmz = dfr.attr("names");
Is there any reason to prefer one to the other, or are they considered
equivalent?
_
