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I have managed to plot a histogram of the frequency of top-100 words (I managed to get the top 100 words using topkwords in Text Analytics Toolbox). How can I
1) compute the frequency*rank for every word and,
2) plot (frequency, 1/rank).

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Assuming we have
t = topkwords(bag,100);
You can get frequency*rank as:
t.FreqTimesRank = (1:size(t,1)).*t.Count;
And you can plot frequency against 1/rank by calliong:
plot(t.Count,1./(1:size(t,1)))

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