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R exercise
2.6. Tm package - Dimensionality reduction
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productreviews <- read.csv("5productreviews.csv", header = T, na.strings = "?")
productreviews <- Corpus(VectorSource(productreviews))
productreviews <- DocumentTermMatrix(productreviews, control = list(wordLengths = c(2, Inf), weighting = function(x) weightTfIdf(x)))