Untitled

How do I debug an undefined method for nil class error?

require 'classifier'

 

classifications = '1007.09', '1006.03'

traindata = Hash["1007.09" => "ADAPTER- SCREENING FOR VALVES VBS", "1006.03" => "ACTUATOR- LINEAR"]

 

b = Classifier::Bayes.new classifications

 

traindata.each do |key, value|  

b.train(key, value)

end

       

Notice: for 10x faster LSI support, please install http://rb-gsl.rubyforge.org/

c:/Ruby192/lib/ruby/gems/1.9.1/gems/classifier-1.3.3/lib/classifier/bayes.rb:27:in `block in train': undefined method `[]' for nil:NilClass (NoMethodError)

  from c:/Ruby192/lib/ruby/gems/1.9.1/gems/classifier-1.3.3/lib/classifier/bayes.rb:26:in `each'

  from c:/Ruby192/lib/ruby/gems/1.9.1/gems/classifier-1.3.3/lib/classifier/bayes.rb:26:in `train'

  from C:/_Chris/Code/classifier/smdclasser.rb:13:in `block in <main>'

  from C:/_Chris/Code/classifier/smdclasser.rb:11:in `each'

  from C:/_Chris/Code/classifier/smdclasser.rb:11:in `<main>'

       

# Provides a general training method for all categories specified in Bayes#new

# For example:

#     b = Classifier::Bayes.new 'This', 'That', 'the_other'

#     b.train :this, "This text"

#     b.train "that", "That text"

#     b.train "The other", "The other text"

def train(category, text)

  category = category.prepare_category_name

  text.word_hash.each do |word, count|

    @categories[category][word]     ||=     0

    @categories[category][word]      +=     count

    @total_words += count

  end

end

       

b = Classifier::Bayes.new 'This', 'That', 'the_other'

       

b = Classifier::Bayes.new ['This', 'That', 'the_other']

       

b = Classifier::Bayes.new *classifications