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# Rcpp11 useR2014

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### Transcript

• 1. Rcpp11 Romain François romain@r-enthusiasts.com @romain_francois
• 2. Rcpp11 • Targets C++11 • Smaller code base (than Rcpp) • Header only
• 3. #include <Rcpp.h> ! // [[Rcpp::export]] int foo(){ return 2 ; } Rcpp Rcpp11 0 1 2 3 4 Less complexity -> faster compiles
• 4. ! Some examples
• 5. NumericVector constructors // C++ uniform initialization NumericVector x = {1.0, 2.0, 3.0} ; ! // init with given size NumericVector y( 2 ) ; // data is not initialized NumericVector y( 2, 3.0 ) ; // initialize all to 3.0 ! // fuse several vectors (similar to c in R) NumericVector z = fuse(x, y) ; NumericVector z = fuse(x, y, 3.0) ;
• 6. create NumericVector x = {1.0, 2.0, 3.0} ; ! // old school NumericVector::create (Rcpp style). NumericVector x = NumericVector::create(1.0, 2.0, 3.0) ; NumericVector x = NumericVector::create( _["a"] = 1.0, _["b"] = 2.0, _["c"] = 3.0 ) ; ! !// create as a free function. Rcpp11 style NumericVector x = create(1.0, 2.0, 3.0) ; NumericVector x = create( _["a"] = 1.0, _["b"] = 2.0, _["c"] = 3.0 ) ;
• 7. sugar #include <Rcpp11> ! // [[export]] NumericVector foo( NumericVector x ){ return sqrt(exp(x)) + 1.0 ; } ! /*** R foo( c(1,2,3) ) # [1] 2.648721 3.718282 5.481689 */
• 8. sapply + lambda
• 9. sapply + lambda #include <Rcpp11> ! // [[export]] NumericVector foo( NumericVector x ){ return sapply(x, [](double d){ return exp(d * 2) ; }); } x <- 1:3 sapply( x, function(d){ exp(d*2) ; })
• 10. sapply + lambda + … #include <Rcpp11> ! // [[export]] NumericVector foo( NumericVector x ){ auto fun = [](double d, double y, double z){ return exp(d * y) + z ; } ; return sapply(x, fun, 3.0, 4.6); } x <- 1:3 sapply( x, function(d, y, z){ exp(d*y) + z ; }, 3.0, 4.6 )
• 11. Rcpp11 release cycle • Available from CRAN: ! • Evolves quickly. Get it from github ! • Next Release: 3.1.1 (same time as R 3.1.1) > install.packages( "Rcpp11" ) > install_github( "Rcpp11/Rcpp11" )
• 12. attributes companion package • Standalone impl of Rcpp attributes [[Rcpp::export]], sourceCpp, compileAttributes ! • Only available from github: > install_github( "Rcpp11/attributes" )
• 13. Use Rcpp11 in your package • Write your .cpp ﬁles #include <Rcpp11> ! // [[export]] void foo( … ) { … } // your code SystemRequirements: C++11 LinkingTo: Rcpp11 library(attributes) compileAttributes( "mypkg" ) • Express dep on C++11 and Rcpp11 headers • Generate the boiler plate
• 14. Romain François romain@r-enthusiasts.com @romain_francois Questions ?