This is a simple gem to calculate XIRR on Bisection Method based on this gist http://puneinvestor.wordpress.com/2013/10/01/calculate-xirr-in-ruby-bisection-method/ and ont Finance gem https://github.com/wkranec/finance

Add this line to your application's Gemfile:

gem 'xirr'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install xirr

include Xirr

cf = Cashflow.new
cf << Transaction.new(-1000,  date: '2014-01-01'.to_time(:utc))
cf << Transaction.new(-2000,  date: '2014-03-01'.to_time(:utc))
cf << Transaction.new( 4500, date: '2015-12-01'.to_time(:utc))
cf.xirr
# 0.25159694345042327 # [Float]

1. Fork it ( https://github.com/tubedude/xirr/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request