Trying to get tf-idf weighting working in R

Question

I am trying to do some very basic text analysis with the tm package and get some tf-idf scores; I\'m running OS X (though I\'ve tried this on Debian Squeeze with the same result

Answer 1

If you look at the DocumentTermMatrix help page, an at the example, you will see that the control argument is specified this way :

data(crude)
dtm <- DocumentTermMatrix(crude,
           control = list(weighting = function(x) weightTfIdf(x, normalize = FALSE),
                          stopwords = TRUE))

So, the weighting is specified with the list element named weighting, not weight. And you can specify this weighting by passing a function name or a custom function, as in the example. But the following works too :

data(crude)
dtm <- DocumentTermMatrix(crude, control = list(weighting = weightTfIdf))