grahamdaley / rarff

(fork) A Ruby library for handling ARFF files, as popularized by the WEKA machine learning program

rarff

DESCRIPTION:

Rarff is a Ruby library for dealing with Attribute-Relation File Format (ARFF) files. ARFF files are used to specify data sets for data mining and machine learning. This library can generate ARFF files from Ruby Arrays of Arrays.

FEATURES

• Missing values - '?' are handled in creation of ARFF files

PROBLEMS

• Spaces or quotes in nominal types
• Commas can cause problems in attribute names, but should work within individual instances
• Error checking/validation
• Creation of sparse ARFF files
• Dates - create, translate, and interpret date format strings.

SYNOPSIS:

require 'wwood-rarff'
rel = Rarff::Relation.new('MyCoolRelation')
rel.instances = [ [1.4, 'foo bar', 5, 'baz', "1900-08-08 12:12:12"],
  [20.9, 'ruby', 46, 'roc,ks', "2005-10-23 12:12:12"],
  [0, 'ruby', 46, 'rocks', "2001-02-19 12:12:12"],
  [68.1, 'stuff', 728, 'is cool', "1974-02-10 12:12:12"]]
rel.attributes[1].name = 'subject'
rel.attributes[4].name = 'birthday'
rel.attributes[4].type = 'DATE "yyyy-MM-dd HH:mm:ss"'
rel.to_arff

generates the String

@RELATION MyCoolRelation
@ATTRIBUTE Attr0 NUMERIC
@ATTRIBUTE subject STRING
@ATTRIBUTE Attr2 NUMERIC
@ATTRIBUTE Attr3 STRING
@ATTRIBUTE birthday DATE "yyyy-MM-dd HH:mm:ss"
@DATA
1.4, 'foo bar', 5, baz, "1900-08-08 12:12:12"
20.9, ruby, 46, roc,ks, "2005-10-23 12:12:12"
0, ruby, 46, rocks, "2001-02-19 12:12:12"
68.1, stuff, 728, 'is cool', "1974-02-10 12:12:12"

== INSTALL:

gem install wwood-rarff

== LICENSE:

Copyright (c) 2008-2012 Ben J. Woodcroft All rights reserved. See LICENSE.txt for details.