# Natural Language Toolkit: Wordfreq Application
#
# Copyright (C) 2001-2012 NLTK Project
# Author: Sumukh Ghodke <sghodke@csse.unimelb.edu.au>
# URL: <http://www.nltk.org/>
# For license information, see LICENSE.TXT

import pylab
import nltk.text
from nltk.corpus import gutenberg

def plot_word_freq_dist(text):
    fd = text.vocab()

    samples = fd.keys()[:50]
    values = [fd[sample] for sample in samples]
    values = [sum(values[:i+1]) * 100.0/fd.N() for i in range(len(values))]
    pylab.title(text.name)
    pylab.xlabel("Samples")
    pylab.ylabel("Cumulative Percentage")
    pylab.plot(values)
    pylab.xticks(range(len(samples)), [str(s) for s in samples], rotation=90)
    pylab.show()

def app():
    t1 = nltk.Text(gutenberg.words('melville-moby_dick.txt'))
    plot_word_freq_dist(t1)

if __name__ == '__main__':
    app()

__all__ = ['app']