simple ruby search

search.rb

terms = Hash.new{|h,k|h[k]=h.size}
docs = DATA.collect { |line| 
  name = line.match(/^\d+/)
  words = line.downcase.scan(/[a-z]+/)
  vector = [] 
  words.each { |word| vector[terms[word]] = 1 }
  {:name=>name,:vector=>vector}
}
current = docs.first # or any other
docs.sort_by { |doc| 
  # assume we have defined cosine on arrays
  doc[:vector].cosine(current[:vector]) 
}
related = docs[1..5].collect{|doc|doc[:name]}

puts related

__END__
0 Human machine interface for Lab ABC computer applications
1 A survey of user opinion of computer system response time
2 The EPS user interface management system
3 System and human system engineering testing of EPS
4 Relation of user-perceived response time to error measurement
5 The generation of random, binary, unordered trees
6 The intersection graph of paths in trees
7 Graph minors IV: Widths of trees and well-quasi-ordering
8 Graph minors: A survey