r - How to weight a TermDocumentMatrix by document length? -

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i'm doing text mining in r using tm package. i'm familiar weighttfidf weighting option:

dtm <- documenttermmatrix(docs, control = list(dictionary = c("argument"), weighting = weighttfidf))

however, documents deal contain term i'm looking for, different degrees - therefore tfidf not work. how can weight termdocumentmatrix length of documents?


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