From: Bharat Ruparel <bruparel@...>
Date: 2007-01-07T03:01:34+09:00
Subject: Ruby Cookbook question

Hello All,
This is a question from Ruby Cookbook by Lucas Carlson & Leonard
Richardson, Oreilly Publication.  Recipe number 1.20 in Chapter 1 on
page 37.
As instructed in the book, I am trying to use the classifer gem to do
Bayesian Analysis.  It advises me to install the classifer gem by using
the 'gem install classifer' command.  gem asks me if I want to install
the stemmer gem as a dependency, I say yes and it installs it.

Next, I am trying to check if everything works by running a snippet out
of the README file from the classifer gem install directory as follows:

test.rb which contains the following lines of code:

    require 'classifier'
    b = Classifier::Bayes.new 'Interesting', 'Uninteresting'
    b.train_interesting "here are some good words. I hope you love them"
    b.train_uninteresting "here are some bad words, I hate you"
    b.classify "I hate bad words and you" # returns 'Uninteresting'

When I run it, I get the following error:

>ruby test.rb
Notice: for 10x faster LSI support, please install
http://rb-gsl.rubyforge.org/
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`method_missing': undefined method `stem' for "here":String
(NoMethodError)
  from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:32:in
`each'
  from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:32:in
`word_hash_for_words'
  from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/extensions/word_hash.rb:20:in
`word_hash'
  from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:26:in
`train'
  from (eval):1:in `method_missing'
  from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`eval'
  from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`method_missing'
  from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`each'
  from
c:/ruby/lib/ruby/gems/1.8/gems/classifier-1.3.0/lib/classifier/bayes.rb:95:in
`method_missing'
  from test.rb:3
>Exit code: 1

I contacted the author, Lucas Carlson, concerning this and he advised me
to install the stemmer gem by doing 'gem install stemmer' command.  I
have done that already by answering Yes to the question by gem installer
if the dependency gem should be installed?  I can also see the stemmer
gem that has been installed in the gems directory.  Mind you, this
happens both in Linux and Windows operating systems, therefore, there is
something that I must be overlooking.  I haven't heard back from the
author.  Therefore, I am posting this question here on the forum to see
if anyone can help.

Thanks in advance.

Bharat

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