daru

https://github.com/sciruby/daru

Ruby

Data Analysis in RUby

Daru::DataFrame#vector_by_calculation

DSL for yielding each row and returning a Daru::Vector based on the
value each run of the block returns.

== Usage

  a1 = Daru::Vector.new([1, 2, 3, 4, 5, 6, 7])
  a2 = Daru::Vector.new([10, 20, 30, 40, 50, 60, 70])
  a3 = Daru::Vector.new([100, 200, 300, 400, 500, 600, 700])
  ds = Daru::DataFrame.new({ :a => a1, :b => a2, :c => a3 })
  total = ds.vector_by_calculation { a + b + c }
  # <Daru::Vector:82314050 @name = nil @size = 7 >
  #   nil
  # 0 111
  # 1 222
  # 2 333
  # 3 444
  # 4 555
  # 5 666
  # 6 777

Source | Google | Stack overflow

Edit

git clone [email protected]:sciruby/daru.git
cd daru
open lib/daru/dataframe.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Daru--DataFrame-vector_by_calculation-for-pr

# Commit to git

git add lib/daru/dataframe.rbgit commit -m "better docs for Daru::DataFrame#vector_by_calculation"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Daru--DataFrame-vector_by_calculation-for-pr

hub pull-request

# Celebrate!