fancyRpkg

Minimal R package for calling compiled code

Calling C code using the .C() function in R

In src/mylib.c there is function that converts its arguments to an integer representation, adds them up and returns the result.

int intsum( int x, double y, char* z)

To call this function from R using the function .C(), we need to provide a wrapper function that returns void instead of int. Thus, src/r_to_mylib.c provides the function:

void Rintsum( int* x, double* y, char** z, int* tot )

For packaging purposes src/init.c tells R about the function Rintsum.

The R function intsum() in R/funcs.r contains the call and prints the return value from .C(): the list of arguments as modified by the function.

Usage

Clone the repo and cd to the package root.

Terminal

Build and install the package from the terminal.

# build 
R CMD build . 

# Check it if you want 
R CMD check fancyRpkg_0.0.1.tar.gz

# install 
R CMD INSTALL fancyRpkg_0.0.1.tar.gz

Open an R session

library(fancyRpkg)
intsum( 2, 3.333, "abcd")

via devtools

In an R session with packages devtools and roxygen2 installed:

library(devtools)
document()
intsum( 2, 3.333, "abcd")

Requirements

On Ubuntu

sudo apt-get install -y libcurl4-openssl-dev libxml2-dev r-base-dev texlive-full