ruppercaselowercase
R: Keep Upper Case with TermDocumentMatrix
I want to create a wordcloud with the wordcloud package. My problem is that I want to keep the upper case at the beginning of the words but all letters are automatically transformed to lower cases.
As far as I see, this happens when I use the TermDocumentMatrix function. Is there a possibility to prevent the function from transforming all letters to lower cases?
Solution
You can prevent TermDocumentMatrix from converting everything to lower case, by specifying tolower=FALSE in your control list. Since you do not provide any data, I will illustrate with the sample data provided in the tm package.
library(wordcloud)
library(tm)
data(crude)
tdm = TermDocumentMatrix(crude,
control=list(removePunctuation=T, tolower=F, stopwords=T))
WordFreq = slam::row_sums(tdm[tdm$dimnames$Terms, ])
FrequentWords = tail(sort(WordFreq), 20)
wordcloud(names(FrequentWords), FrequentWords)
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