Most data items in R are vectors, e.g. integers, reals, characters,
etc. inline-r supports constructing and manipulating R vectors
entirely in Haskell, without invoking the R interpreter, and using the
same API as the de facto standard
vector package.
Conversely, any data that is stored as an R vector rather than some
other vector type can be fed to R functions without any prior
conversion or copying. Considering that the memory layout of an
R vector is practically as efficient as any other unboxed
representation, programs that interact with the R interpreter
frequently should consider using R vectors as a representation by
default.
Please refer to the Haddock generated documentation of the
Data.Vector.SEXP and Data.Vector.SEXP.Mutable modules for a full
reference on the vector API supported by inline-r.