Jl4R package

Introduction

The R package jl4R is devoted to remotely play with julia packages within the R system. The dedicated goal of the package is at some point to replace the use of Rcpp by creating some R wrapper package associated to existing julia packages.

Getting started

To start presenting the R package jl4R, let us start with some very basic session.

require(jl4R)
v_jl <- jl(c(1,3,2))
v_jl
jltypeof(v_jl)
length(v_jl)
v_jl[2]
jltypeof(v_jl[2])
R(v_jl) # ou toR(v_jl)

R> require(jl4R)
R> v_jl <- jl(c(1,3,2))
R> v_jl
3-element Vector{Float64}:
 1.0
 3.0
 2.0
R> jltypeof(v_jl)
Vector{Float64} (alias for Array{Float64, 1})
R> length(v_jl)
[1] 3
R> v_jl[2]
3.0
R> jltypeof(v_jl[2])
Float64
R> R(v_jl) # ou toR(v_jl)
[1] 1 3 2

Internally, an julia instance (here an Array) is represented as an externalptr

typeof(v_jl)
class(v_jl)

R> typeof(v_jl)
[1] "externalptr"
R> class(v_jl)
[1] "Array"   "jlvalue"