Monthly Archives: November 2011

A nice short article on memory in R

Posted on November 28, 2011 by Yanchang Zhao

There is a nice short article on memory issue in R at http://www.matthewckeller.com/html/memory.html. If you use R to process large data, you might find it helpful. It introduces: – checking how much memory an object is taking; – the memory … Continue reading →

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Using Text Mining to Find Out What @RDataMining Tweets are About

Posted on November 9, 2011 by Yanchang Zhao

This post shows an example on text mining of Twitter data with R packages twitteR, tm and wordcloud. Package twitteR provides access to Twitter data, tm provides functions for text mining, and wordcloud visualizes the result with a word cloud. … Continue reading →

Posted in Data Mining, R | Tagged , , | 25 Comments

Help: stemming and stem completion with package tm in R

Posted on November 4, 2011 by Yanchang Zhao

I came across a problem below when doing stemming and stem completion with package tm in R. Word “mining” was stemmed to “mine” with stemDocument(), and then completed to “miners”with stemCompletion(). However, I prefer to keep “mining” intact. For stemCompletion(), … Continue reading →

Posted in Data Mining, R | Tagged , | 2 Comments