Data Manipulation Functions Implemented in C
Nested if else
Parallel Sort
Parallel (Statistical) Functions
Set levels of a factor object
Share Data between R Sessions
Top N values index
Vectorised switch
Fast if else
Convert Character Vector to Factor
count, countNA and countOccur
Find a matrix position inside a larger matrix
Fast duplicated and unique
Basic functions, implemented in C, for large data manipulation. Fast vectorised ifelse()/nested if()/switch() functions, psum()/pprod() functions equivalent to pmin()/pmax() plus others which are missing from base R. Most of these functions are callable at C level.
Useful links