• Install Ubuntu 14.04.3 on your laptop
• Useful: http://releases.ubuntu.com/14.04/ubuntu-14.04.3-desktop-amd64.iso
• Useful: https://www.virtualbox.org/wiki/Downloads
  http://www.google.com/search?q=How+to+install+virtualbox
  How to install virtualbox guest additions
  virtualbox_why_tiny
• Enhance Ubuntu:

  
  sudo apt-get update
  sudo apt-get upgrade
  
  sudo apt-get install autoconf bison build-essential libssl-dev libyaml-dev \
  libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm3       \
  libgdbm-dev libsqlite3-dev gitk postgresql postgresql-server-dev-all  \
  libpq-dev emacs wget curl chromium-browser openssh-server aptitude    \
  ruby ruby-dev sqlite3
  
  sudo apt-get update
  sudo apt-get upgrade
  

• Create account named ann:

  useradd ann -m -s /bin/bash
  passwd ann
  ssh -YA ann@localhost

• emacs ~ann/.emacs

• Experiment with the controls at the top of the emacs window
• Add this syntax to file: ~ann/.emacs

  ;;
  ;; ~ann/.emacs
  ;;
  (global-set-key "\C-xs" 'shell)
  (global-set-key "\em"   'buffer-menu-other-window)
  (global-set-key "\eR"   'rename-buffer)
  ;; end of .emacs
  

• Figure out how to save and exit
• Verify your work:

  cat ~ann/.emacs

• Start 'bare' emacs:

  emacs

• Start a shell in emacs with ctrl-x then letter 's'.
• I should see something like this:
  
• Rename the shell to SHELL1 with esc-key, then letter 'R'
• I should see something like this:
  
• List all buffers in my emacs with esc-key, then letter 'm'
• I should see something like this:
  

• different shells
• different files
• different folders

• Interact with file
• Interact with folder
• Interact with shell
• Interact with browser

• After I learn some Emacs or some other editor, I Install Node.js in this folder: ~ann/node/

• cd ~ann
  wget https://nodejs.org/dist/v5.0.0/node-v5.0.0-linux-x64.tar.gz
  tar zxf node-v5.0.0-linux-x64.tar.gz
  rm -rf node
  mv node-v5.0.0-linux-x64 node

• Then, I add Node.js to PATH:

  export       PATH="/home/ann/node/bin:${PATH}"
  echo 'export PATH="/home/ann/node/bin:${PATH}"' >> ~ann/.bashrc

• Run a test:

  which node
  node -e 'console.log("hello world")'

• Install CoffeScript to test npm:

  which npm
  npm install -g coffee-script
  ls -la /home/ann/node/lib/node_modules/
  which coffee
  coffee -e 'console.log "hello coffee!"'

• Start work on an app:

  cd ~ann
  echo 'gem: --no-ri --no-rdoc' >> ~ann/.gemrc
  rm -rf app26r
  git clone https://github.com/danbikle/app26r.git
  cd ~ann/app26r
  .  ~ann/app26r/app26r.bash
  rm -rf   $GEM_HOME
  mkdir -p $GEM_HOME
  /usr/bin/gem install bundler
  $GEM_HOME/bin/bundle install
  ~ann/app26r/bin/rails s -p 3326
  /usr/bin/curl localhost:3326|head

• Create an account at heroku.com website
• Download/Install Heroku client

  cd ~ann
  wget https://s3.amazonaws.com/assets.heroku.com/heroku-client/heroku-client.tgz
  tar zxf heroku-client.tgz
  echo 'export PATH=/home/ann/heroku-client/bin:${PATH}' >> ~ann/.bashrc
  echo  export PATH=/home/ann/heroku-client/bin:${PATH}

• I created ssh-key for ann account (assuming ann has none yet):

  ann@dev06:~$ 
  ann@dev06:~$ ssh-keygen -t rsa
  Generating public/private rsa key pair.
  Enter file in which to save the key (/home/ann/.ssh/id_rsa): 
  Created directory '/home/ann/.ssh'.
  Enter passphrase (empty for no passphrase): 
  Enter same passphrase again: 
  Your identification has been saved in /home/ann/.ssh/id_rsa.
  Your public key has been saved in /home/ann/.ssh/id_rsa.pub.
  The key fingerprint is:
  7c:73:e0:26:8b:62:f6:a4:1d:78:22:e5:cd:3a:5c:eb ann@dev06
  The key randomart image is:
  +--[ RSA 2048]----+
  |                 |
  |                 |
  |          .      |
  |       . . .     |
  |    .   S = .    |
  |   o +.. = o     |
  |  ..B.B..        |
  |   +oX..         |
  |    ooE          |
  +-----------------+
  ann@dev06:~$ 
  ann@dev06:~$ 
  ann@dev06:~$ 
  

• I used heroku-client to "login" my shell. I gave a copy of ann public ssh-key to heroku:

  heroku status
  heroku auth:login
  heroku auth:whoami
  heroku keys:add

• I used heroku-client to create a blank app named d1d2 at herokuapp.com

  cd ~ann/app26r
  ~ann/heroku-client/bin/heroku create d1d2

• git-push ~ann/app26r to heroku

  cd ~ann/app26r
  git add .
  git commit -am rails
  git push heroku master

• I saw ~ann/app26r deployed at https://d1d2.herokuapp.com

Questions

• Look at https://d1d2.herokuapp.com and answer what is a histogram?
• What kind of questions can a histogram answer?
• The blue histogram describes a collection of observations, how are the observations collected?
• The blue histogram can show the number of observations where day1 gained between +3% and +4%. How many of those observations can you count?
• If day1 gains -2.0% would you expect day2 to gain more than the median?
• If I use view-source in my browser I can see the JavaScript which builds the charts, where do I find that JavaScript in the Rails app?
• Bostock shows how create a histogram here: http://bl.ocks.org/mbostock/3048450 Does app26r do it the same way or does app26r do something fundamentally different?
• D3.js has this API call d3.layout.histogram(). What does it create exactly? Does it create data? Does it create a chart? Does it create data and a chart?
• About this API call d3.layout.histogram(), What does it take as an input?
• Compare and contrast app25r and app26r.