[Rcpp-devel] Rcpp equivalent of sample()?

Chris DuBois chris.dubois at gmail.com
Sun May 15 02:13:53 CEST 2011

Thanks Dirk.  Quick newbie followup question: Can we put functions within
the inline C++ code?  The following doesn't compile, for example:
src <- '
int addition (int a, int b)
  int r;
  return (r);
NumericVector xx(x);
testfun = cxxfunction(signature(x="numeric"),body=src,plugin="Rcpp")

On a related note, would you mind showing a quick working example using
std::accumulate?  The one below from the quick reference doesn't compile for

Thanks in advance.

std::accumulate( xx.begin(), xx.end(),std::plus<double>(), 0.0 );

On Sat, May 14, 2011 at 2:54 PM, Dirk Eddelbuettel <edd at debian.org> wrote:

> On 14 May 2011 at 14:11, Chris DuBois wrote:
> | I'm just getting my feet wet with some Rcpp.  I'm comfortable with R but
> new
> | to C++.  In the Rcpp vignettes, I found some of the R-like functions for
> | sampling from distributions (runif, rnorm, etc), but I didn't see a
> function
> | mimicking sample(). I checked the list of unit tests and didn't see it
> there
> | either.  Have I missed it?  Is there a C++ function I should be using to
> | sample (with replacement in my particular situation) from a vector (with
> | provided weights).
> No, sorry, I think you'd have to write a local version.
> Dirk
> --
> Gauss once played himself in a zero-sum game and won $50.
>                      -- #11 at http://www.gaussfacts.com
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