JuliaTutorial

This is a brief Julia tutorial for oceanographers. Please consult additional tutorials, like the following ones, if you are new to julia (or programming in general):

• An Introduction to Julia by Jane Herriman
• Julia language: a concise tutorial by A. Lobianco

These notebooks can either be used:

• on the computers in the computer room (2/25, 2nd floor of the B5A building)
• on your machine following the introductions below
• on MyBinder.org using the link (this can take 2 to 10 minutes to start). Do not forget to download and save your notebook and results. Remember to stop the notebooks (File -> Closes and Halt) to free resources.

Setting-up your work environment

Required software:

• Julia available from https://julialang.org/downloads/. The exercise is tested with the version 1.6 of Julia. Some additional information is available here: https://github.com/gher-ulg/Documentation/wiki/Installing-Julia
• Some Julia packages, which can be installed with these commands once you started Julia:

using Pkg
cd("/home/abarth/Lectures/JuliaTutorial")
using Pkg
Pkg.activate(".")
Pkg.instantiate()

where you replace "/home/abarth/Lectures/JuliaTutorial" by the folder where you downloaded (and extracted) the notebook files. Note on Windows you need to use the backslash as path separator a raw string for example raw"C:\Users\Name\Documents\JuliaTutorial".

using IJulia
notebook(dir = "/home/abarth/Lectures/JuliaTutorial")

Preview the notebook files

By following the link to nbviewer.jupyter.org you see a list of all notebooks. For the example the Introduction notebook is available at https://nbviewer.jupyter.org/github/Alexander-Barth/JuliaTutorial/blob/master/JuliaIntroduction.ipynb .

Optional configuration (if using Linux)

• Editor with julia support. For example, install emacs and the file julia-mode.el as follows:

mkdir ~/site-lisp
cd ~/site-lisp
wget https://raw.githubusercontent.com/JuliaEditorSupport/julia-emacs/master/julia-mode.el
wget https://raw.githubusercontent.com/JuliaEditorSupport/julia-emacs/master/julia-latexsubs.el
cat >> ~/.emacs <<EOF
;; Add a local lisp folder to your load-path
(setq load-path (append load-path (list "~/site-lisp")))
(require 'julia-mode)
(setq auto-mode-alist (append '(("\\.jl$" . julia-mode)) auto-mode-alist))

EOF

• Install a desktop launcher and icon for julia

wget -O /tmp/julia.desktop https://raw.githubusercontent.com/JuliaLang/julia/e90f29db30f81f340d4f36669b27ac5a281e2a7f/contrib/julia.desktop
desktop-file-install --dir=$HOME/.local/share/applications /tmp/julia.desktop
mkdir -p ~/.local/share/icons/hicolor/scalable/apps/
cd ~/.local/share/icons/hicolor/scalable/apps/
wget https://raw.githubusercontent.com/JuliaLang/julia/30bf89f3d8e564b588b8e48993e92a551b384f2c/contrib/julia.svg
cd ~