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# The partition (combinatoric partition theory) function for a given number
def partition(largest, rest = Array.new, &block)
    block.call([largest] + rest)
    (rest.first || 1).upto(largest / 2) do |i|
        partition(largest - i, [i] + rest, &block)
    end
end

# call the partition function with "5" as a test
partition(5) { |nums| p nums if nums[0] != 5 }

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Ruby on Rails development setup on Ubuntu 12.04

System update

# change mirror to ubuntu.osuosl.org first
sudo apt-get update

Install common libraries

sudo apt-get install build-essential libreadline-dev libssl-dev zlib1g-dev libxml2-dev libxslt-dev

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group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer'

  gem 'uglifier', '>= 1.0.3'
  # Add Foundation Here
  gem 'compass-rails' # you need this or you get an err

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IE 10 CSS Border Hack

border-image

Option 1 (Fall back)

From Microsoft Blog and html5please:
Internet Explorer 10 doesn’t include support for CSS border-image. To preserve the layout of your page, a best practice is to specify a solid border-style fallback so border widths, padding, and margin are preserved. (If IE doesn’t find a supported border type, it will discard those values.) For example:

Before:

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Using Git

Global Settings

Related Setup: https://gist.github.com/hofmannsven/6814278

Related Pro Tips: https://ochronus.com/git-tips-from-the-trenches/

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# Legitimately-useful utilities missing from OS X.
brew install wget watch gnu-sed coreutils

# Up-to-date versions of included tools.
brew install git emacs

# Just for fun.
brew install fortune cowsay

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Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

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# dump all databases once every 24 hours
45 4 * * * root nice -n 19 su - postgres -c "pg_dumpall --clean" | gzip -9 > /var/local/backup/postgres/postgres_all.sql.gz

# vacuum all databases every night (full vacuum on Sunday night, lazy vacuum every other night)
45 3 * * 0 root nice -n 19 su - postgres -c "vacuumdb --all --full --analyze"
45 3 * * 1-6 root nice -n 19 su - postgres -c "vacuumdb --all --analyze --quiet"

# re-index all databases once a week
0 3 * * 0 root nice -n 19 su - postgres -c 'psql -t -c "select datname from pg_database order by datname;" | xargs -n 1 -I"{}" -- psql -U postgres {} -c "reindex database {};"'

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PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

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Build docker image

$ cd /path/to/Dockerfile
$ sudo docker build .

View running processes