romainfrancois/benchmarks.md

## benchmarks.md

      
    Raw
  

              benchmarks.md
            
          
    This little benchmark compares the times it take to compile a really simple Rcpp example (the example you get from RStudio when you do new C++ file) with Rcpp and Rcpp11.
require(microbenchmark)
compile_Rcpp <- function(){
  Rcpp::sourceCpp("/tmp/timesTwo.cpp", rebuild = TRUE )
}
compile_Rcpp11 <- function(){
  attributes::sourceCpp( "/tmp/timesTwo.cpp" )
}

These timings come from my iMac running Mavericks.
> microbenchmark( Rcpp = compile_Rcpp(), Rcpp11 = compile_Rcpp11(), times = 10 )
Unit: seconds
   expr      min       lq   median       uq      max neval
   Rcpp 3.061308 3.068119 3.069977 3.071560 3.258582    10
 Rcpp11 1.475950 1.479628 1.480901 1.485374 1.512100    10


## timesTwo.cpp
#include <Rcpp.h>
using namespace Rcpp;

// [[Rcpp::export]]
int timesTwo(int x) {
   return x * 2;
}
	#include <Rcpp.h>
	using namespace Rcpp;

	// [[Rcpp::export]]
	int timesTwo(int x) {
	return x * 2;
	}