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1.1. Term weighting - TF and TF-IDF
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dtm <- matrix(c(0,1,3,0,2,2,2,0,2,0,0,0,6,0,6,0,8,7,8,7),ncol=5)
colnames(dtm) <- c("term1","term2","term3","term4","term5")
rownames(dtm) <- c("doc1","doc2","doc3","doc4")
idf <-
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