Not precisely what you asked for, but since you appear to be in danger of reinventing wheels, I thought I'd point out that there are many mature packages available for handling NLP-related tasks. You may see planetscape's scratchpad for some; don't neglect Super Search either, which you can use to turn up things like Ted Pedersen's Ngram Statistics Package by searching for "ngram" or "word frequency"...

HTH,

planetscape

In reply to Re: a question about making a word frequency matrix by planetscape
in thread a question about making a word frequency matrix by peacekorea

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