The iai package is a wrapper around the Julia implementation of IAI algorithms, so you need to configure a working Julia installation in addition to installing the R package from CRAN.

Installing Julia and IAI modules

Follow the instructions for installing the IAI system image to get a working Julia installation with the IAI modules included.


For the R interface, you must replace the default system image (Option 1) as there is no way to specify a custom image from inside R

Installing the R package

You can install the R package with


In order to use Julia to run the IAI algorithms, R also needs to know where to find Julia on your computer. We recommend that you specify the location to the Julia installation with the JULIA_HOME variable. The value of this variable should be the path to the Julia installation folder:


If you are unsure about which directory to use for JULIA_HOME, you can find the directory by running the following command inside Julia:

julia> unsafe_string(Base.JLOptions().julia_bindir)

The recommended way of specifying JULIA_HOME is using your .Renviron file, which can be configured via the usethis package:

usethis::edit_r_environ(scope = "user")

This will bring up your environ file, which you can edit to specify JULIA_HOME:

JULIA_HOME="the folder that contains julia binary"

Once you restart R, the change will take effect

There are other options for setting JULIA_HOME that might better suit some scenarios, you can refer to the JuliaCall documentation to see all options.

Alternatively, instead of using JULIA_HOME, you can add your Julia installation to the system PATH.

Using the R package

You can start using the iai package immediately. The first time you use an IAI function in a new R session, it will automatically initialize the connection to Julia.