Unite provides module extensions to your ruby objects for unit/value support.
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README.md

Install

With Bundler

gem 'unite'

Without Bundler

gem install unite

It's Science

It's Science

Based on the algorithms developed by Gordon S. Novak, Jr. at the University of Texas, which can be found here:

http://www.cs.utexas.edu/users/novak/units95.html

Dimensions

Handles the following dimensions:

[:length, :time, :temperature, :mass, :current, :substance, :luminosity]

Can use Unite::Quantity to represent values or include the functionality into your own objects.

Look at https://github.com/stellard/unite/blob/master/lib/unite/quantity.rb for a minum implementation

Examples:

TODO: Needs more info here.

Unite::Quantity.init("1000*km")
Unite::Quantity.init("1000","km")

Unit definitions are found here:

https://github.com/stellard/unite/blob/master/lib/unite/lookup/definitions.rb

Specs show good examples of use.