John Careaga johnc219

## rpi-notes.md

      
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                johnc219
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              Created
              November 22, 2016 19:11
            
          
    Raspberry Pi Onboarding Steps


Updating packages

sudo apt-get update
sudo apt-get upgrade
sudo apt-get clean
sudo apt-get autoremove


Installing Vim

sudo apt-get vim


Apply a .vimrc
Change default editor


## switch_statements.rb
## -----------------------------------------------------------------------------
## Replace Type Code With Subclasses
## Replace Conditional with Polymorphism
## -----------------------------------------------------------------------------

# Start

class Animal
  def initialize(type_code)
    @type_code = type_code

## sierpinski.rb
# Calculate number of triangles (that don't contain triangles) inside a
# Sierpinski triangle
module Sierpinski
  # @param [Integer] n - number of iterations
  # @return [Integer] the number of triangles that don't contain triangles
  #
  # f(n) = 4(f(n - 1) - f(n - 2)) + f(n - 2)
  # T(n) in O(n)
  def self.triangles(n)
    raise 'must be nonnegative' if n < 0
	## -----------------------------------------------------------------------------
	## Replace Type Code With Subclasses
	## Replace Conditional with Polymorphism
	## -----------------------------------------------------------------------------

	# Start

	class Animal
	def initialize(type_code)
	@type_code = type_code
	# Calculate number of triangles (that don't contain triangles) inside a
	# Sierpinski triangle
	module Sierpinski
	# @param [Integer] n - number of iterations
	# @return [Integer] the number of triangles that don't contain triangles
	#
	# f(n) = 4(f(n - 1) - f(n - 2)) + f(n - 2)
	# T(n) in O(n)
	def self.triangles(n)
	raise 'must be nonnegative' if n < 0