bfb / arff

arff ruby parser

ARFF Ruby parser

An ARFF (Attribute-Relation File Format) file is an ASCII text file that describes a list of instances sharing a set of attributes.

Check out details about the ARFF structure in this link http://www.cs.waikato.ac.nz/ml/weka/arff.html.

Usage

Creating an ARFF file

Initialize an ARFF document.

doc = Arff::Document.new('Cars')

Add attributes to the document. You can add each attribute separately or together.

doc.add_attribute({ name: 'brand', type: 'STRING' })
doc.add_attributes([
                      { name: 'model', type: 'STRING' },
                      { name: 'top_speed', type: 'NUMERIC'}
                      { name: 'color', type: ['White', 'Black', 'Silver', 'Red']}
                    ])

Add some instances to the document.

doc.add_instance('BMW', 'BMW 4 Series Coupé', 'White')
doc.add_instances([['Aston Martin', 'V8 Vantage SP10', 'Black'], ['Dodge', 'Challenger', 'Red']])

You can access all document structure as objects.

doc.attributes
# returns an array of Arff::Attribute objects
doc.instances
# returns an array of Arff::Instance objects

You can access the instance attributes.

instance = doc.instances.first
instance.brand # 'BMW'
instance.model # 'BMW 4 Series Coupé'
instance.color # 'White'

You can generate the ARFF file with 3 lines of code.

file = File.new('my_doc.arff', 'wb')
file.write = doc.to_arff
file.close

Parsing an ARFF file

doc = Arff::Document.parse('./my_doc.arff')

• Parser not completed yet.

Contributing

1. Fork it
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 new Pull Request