Julia in RMarkdown

Changcheng Li

2021-01-04

Use JuliaCall as Julia Engine in R Markdown

To use JuliaCall package for julia engine in R Markdown document, just set the language of the code chunk to be julia.

## This is a julia language chunk.
## In julia, the command without ending semicolon will trigger the display
## so is JuliaCall package.
## The julia display will follow immediately after the corresponding command
## just as the R code in R Markdown.

a = sqrt(2);
a = sqrt(2)
## 1.4142135623730951

Support for Plots.jl

Plots.jl is an easy to use and powerful julia package for plotting, see https://github.com/JuliaPlots/Plots.jl for more detail. Before the first time using Plots.jl, you first need to install the package like:

import Pkg; Pkg.add("Plots")

After installation of the package, you can use it like this:

using Plots
gr()
## Plots.GRBackend()
plot(Plots.fakedata(50,5),w=3)

Get Access to Julia in R Chunk

You can also get access to julia variables in R code chunk quite easily using JuliaCall, for example:

library(JuliaCall)
## This is a R language chunk.
## In the previous julia chunk, we define variable a,
## we can use functions in JuliaCall to get access to it.
julia_eval("a")
## [1] 1.414214