Add some useful Julia packages, such as PyPlot

These “Pkg.add” comands only need to be done “once per computer”.

using Pkg

# Use a version of the Python package Matplotlib
Pkg.add("PyPlot")

  Resolving package versions...
No Changes to `~/.julia/environments/v1.5/Project.toml`
No Changes to `~/.julia/environments/v1.5/Manifest.toml`

Deploy with

using PyPlot

# Allow LaTeX notation in creating strings, using prefix "L"; for example:
# L"y = \cos(x)"
Pkg.add("LaTeXStrings")  # Only needed once!

  Resolving package versions...
No Changes to `~/.julia/environments/v1.5/Project.toml`
No Changes to `~/.julia/environments/v1.5/Manifest.toml`

# Add some random number stuff
Pkg.add("random")

   Updating registry at `~/.julia/registries/General`

The following package names could not be resolved:
 * random (not found in project, manifest or registry)


Stacktrace:
 [1] pkgerror(::String) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Types.jl:52
 [2] ensure_resolved(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; registry::Bool) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/Types.jl:837
 [3] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; preserve::Pkg.Types.PreserveLevel, platform::Pkg.BinaryPlatforms.MacOS, kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/API.jl:177
 [4] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/API.jl:139
 [5] #add#21 at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/API.jl:67 [inlined]
 [6] add at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/API.jl:67 [inlined]
 [7] #add#20 at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/API.jl:66 [inlined]
 [8] add at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/API.jl:66 [inlined]
 [9] add(::String; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/API.jl:65
 [10] add(::String) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Pkg/src/API.jl:65
 [11] top-level scope at In[2]:2
 [12] include_string(::Function, ::Module, ::String, ::String) at ./loading.jl:1091

Deploy with

using random