Practice Julia packages
A set of packages are installed when you install Julia. They are stored in the standard library or stdlib (in Linux, they are in /usr/share/julia/stdlib/vx.x , where vx.x is the installed Julia version).
Here is the list:
Base64 CRC32c Dates DelimitedFiles Distributed FileWatching Future InteractiveUtils Libdl LibGit2 LinearAlgebra Logging Markdown Mmap Pkg Printf Profile Random REPL Serialization SHA SharedArrays Sockets SparseArrays Statistics SuiteSparse Test Unicode UUIDs
They are not automatically loaded at the start of a session, so before you can use them, you need to load them as you would do for external packages (see below).
To add functionality to Julia, you can install external packages from an ever-growing collection developed by the Julia community.
How to find external packages
All registered packages are on GitHub and can easily be searched here by name or tag.
GitHub allows to easily get an idea about the popularity of a package (number of stars) and whether it is under current development (age of latest commit).
These packages get installed in your personal library (in linux, it is in ~/.julia ).
How to manage external packages
In package mode (accessed in the Julia REPL by pressing ] ), you can manage your personal library easily with the following commands:
pkg> add <package> # install <package> pkg> rm <package> # uninstall <package> pkg> status <package> # status of <package> pkg> update <package> # update <package> pkg> status # status of all installed packages pkg> update # update all packages
- Replace <package> by the name of the package (e.g. Plots )
- You can use up instead of update and st instead of status
- To install, uninstall, or update several packages at once, list them with a space:
pkg> add <package1> <package2> <package3>
An alternative to this convenience mode is to load the package manager (part of stdlib), called Pkg and use it as you would any other package:
using Pkg Pkg.add("<package>") # install <package> Pkg.rm("<package>") # uninstall <package> Pkg.status("<package>") # status of <package> Pkg.update("<package>") # update <package> Pkg.update() # status of all installed packages Pkg.status() # update all packages
- The short forms up and st do not work in this context
- To install, uninstall, or update several packages at once, you need to create an array:
Pkg.add(["<package1>", "<package2>", "<package3>"])
Install the following packages (locally, don’t worry about the cluster):
You can load a package with using <package> (e.g. using Plots ).
Load your newly installed packages to make sure that they got installed properly.
Don’t be surprised if this takes a long time: the first time you load a package, Julia compiles it.
Next time you load it, it will be a lot faster.
(StatsPlots is particularly long to load).
If you have issues installing the required packages, please sign up for the debug session to make sure that you are set before our next Zoom meeting (we will not have time to debug installation issues during that meeting).