The first code:Rcpp

sourceCpp is the important function in Rcpp. The Rcpp code is written into file with'.cpp' extension. The cppFunction can be useful but we can not  easily combine many functions in the same time. This is an example to use the two possibility:

• ccpFunction

R code:

Rcpp::cppFunction(
'int fibonacci(const int x) {
if (x == 0) return(0);
if (x == 1) return(1);
return (fibonacci(x - 1)) + fibonacci(x - 2);
}')

fibonacci(20)

• sourceCpp

I used the example used in the Rstudio C++ source file.

Get the source file: firstrun.cpp and save it in the same R directory.

R code:

Rcpp::sourceCpp('firstrun.cpp')

Rcpp:the first step

Rcpp uses the C++ compiler to produce a sharing library connectable with R environment. The fist step is to install  the Rtools program provided in CRAN site. The second step is to install the Rcpp package.It is important to use a good  editor such Rstudio which integrates the C++ code directly.