Julia-Intro

#README

From 
https://github.com/JuliaComputing/JuliaBoxTutorials/tree/master/introductory-tutorials/intro-to-julia/short-version

lightly adapted.

00.Jupyter_notebooks.ipynb

01.Getting_to_know_Julia.ipynb

02.Linear_Algebra.ipynb

03.Using_packages.ipynb

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 "cells": [
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   "cell_type": "markdown",
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   "source": [
    "# Packages\n",
    "\n",
    "Julia has over 2000 registered packages, making packages a huge part of the Julia ecosystem.\n",
    "\n",
    "Even so, the package ecosystem still has some growing to do. Notably, we have first class function calls  to other languages, providing excellent foreign function interfaces. We can easily call into python or R, for example, with `PyCall` or `Rcall`.\n",
    "\n",
    "This means that you don't have to wait until the Julia ecosystem is fully mature, and that moving to Julia doesn't mean you have to give up your favorite package/library from another language! \n",
    "\n",
    "To see all available packages, check out\n",
    "\n",
    "https://pkg.julialang.org/\n",
    "or\n",
    "https://juliaobserver.com/\n",
    "\n",
    "For now, let's learn how to use a package."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The first time you use a package on a given Julia installation, you need to use the package manager to explicitly add it:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "using Pkg\n",
    "Pkg.add(\"Example\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Every time you use Julia (start a new session at the REPL, or open a notebook for the first time, for example), you load the package with the `using` keyword"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "using Example"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "In the source code of `Example.jl` at\n",
    "https://github.com/JuliaLang/Example.jl/blob/master/src/Example.jl\n",
    "we see the following function declared\n",
    "\n",
    "```\n",
    "hello(who::String) = \"Hello, $who\"\n",
    "```\n",
    "\n",
    "Having loaded `Example`, we should now be able to call `hello`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "hello(\"it's me. I was wondering if after all these years you'd like to meet.\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Now let's play with the Colors package"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "Pkg.add(\"Colors\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "using Colors"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Let's create a palette of 100 different colors"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "palette = distinguishable_colors(100)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "and then we can create a randomly checkered matrix using the `rand` command"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "rand(3, 3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "rand(1:10, 3, 3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "rand(palette, 3, 3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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04.Intro_to_plotting.ipynb

05.Julia_is_fast.ipynb

06.Multiple_dispatch.ipynb

07.Types.ipynb