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I sampled a small wikipedia collection from 2008 and trying generate a graph similar to this: http://en.wikipedia.org/wiki/File:Wikipedia-n-zipf.png
from the processing I did. I have word frequencies and ranks of words. How can I generate the graph on the fly from the data I collected? Thanks.
If I am understanding your question correctly, you want to generate PNG charts on the fly?
This Page lists a few great chart engines for PHP. If you want to generate graphics using PHP for word frequencies, my personal favorite is PCHART It is a really nice library to generate charts like that.
Google Chart is completely free and doesn’t use as much server power, but you have much less control over caching, styling, etc. The key difference here is that the actual image generation is done by Google.
If you want it to look exactly like that, you can use any of them and use the most basic settings to get what you need.