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1.2. Term weighting - Weighted dtm
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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 <- nrow(dtm) / colSums(dtm >= 1)
idf_mat <- matrix(rep(idf, 4),
nrow = nrow(dtm),
ncol = ncol(dtm),
byrow = TRUE)
dtm_weighted <-
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