R DocumentTermMatrix control list not working, silently ignores unknown parameters

Question

I have two following DTM-s:

dtm <- DocumentTermMatrix(t)

dtmImproved <- DocumentTermMatrix(t, 
               control=list(minWordLength = 4, minDocFr         


        

Answer 1

It is always a good idea to read the source code if available. Read the Source code of the wordcloud function@GitHub, here is what it says:
# Author: ianfellows
.....
if(min.freq > max(freq))
min.freq <- 0

So your DocumentTermMatrix, returned a max(freq) < min.freq bound that you set, i.e. non-of the terms appeared in more than your min.freq bound that you set.

Hope this Helps MJJ

Answer 2

dtmImproved <- DocumentTermMatrix(t, control=list(wordLengths=c(4, 15), 
                                   bounds = list(global = c(5,Inf))))

This solves the problem! The lack of proper documentation really mads me down (: