Valuation

A Corporate Finance Ruby Gem. For those of you who are sick of using excel for all your finance calculations. Now there is an alternative for you Ruby hackers.

Features

• Calculate the NPV, FV or IRR of a series of cash flows
• Convert interest rates from different time periods (APR, EAR)
• Access functions for Annuity, Perpetuity

Examples

> require ‘valuation’

> include Valuation

Cash Flows

> CashFlows.new([10,10,10], :i => 0.10).present_value

=> 27.3553719008264

> CashFlows.new([10,10,10], :i => 0.10).future_value

=> 33.1

> CashFlows.new([-10,10,10]).irr

=> 0.618033338439153

Interest Rate

> ir = InterestRate.new(0.10)

> ir.yearly

=> 0.10

> ir.rate

=> 0.10

> ir = InterestRate.new(0.01, :monthly)

> rate.yearly

=> 0.12682503013197

> ir = InterestRate.new(0.12, :apr, :compounded => :monthly)

> ir.monthly

=> 0.01

> ir.yearly

=> 0.12682503013197