From: gotoken@... (GOTO Kentaro)
Date: 2001-03-01T03:14:19+09:00
Subject: [ruby-talk:11799] Re: building n-grams

In message "[ruby-talk:11788] building n-grams"
    on 01/03/01, Arno Erpenbeck <aerpenbe@uos.de> writes:

>while line = gets
>  line.gsub(/[a-zA-Z\s]{3,3}/) {|p| print "#{p},"}
>end
>
>However, this makes "too big" steps because the regexp matches one
>triple and then the next one behind it, but no overlaps. There must be a
>simple solution I guess.
>
>Example:
>Input "The man sees the boy with the telescope."
>Output "The, ma,n s,ees, th,e b,oy ,wit,h t,he ,tel,esc,ope,"
>Desired output "The,he ,e m, ma,man,..."

Here is straightforward one:

  class Integer
    def gram_of(str)
      res = []
      for i in 0..str.size-self
	res.push str[i,self]
      end
      res
    end
  end

  str = "The man sees the boy with the telescope."
  puts "## 3gram",   3.gram_of(str)
  puts "## 100gram", 100.gram_of(str)

-- Gotoken