R DocumentTermMatrix控件列表不起作用，静默忽略未知参数

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问题描述

我有以下两个DTM:

dtm <- DocumentTermMatrix(t)

dtmImproved <- DocumentTermMatrix(t, 
               control=list(minWordLength = 4, minDocFreq=5))

实现此功能时，我看到两个相等的DTM-，如果打开dtmImproved，则会有带有3个符号的单词. minWordLength参数为什么不起作用?谢谢！

When I implement this, I see two equal DTM-s and if I open the dtmImproved, there are words with 3 symbols. Why doesn't the minWordLength parameter work? Thank you!

> dtm
A document-term matrix (591 documents, 10533 terms)

Non-/sparse entries: 43058/6181945
Sparsity           : 99%
Maximal term length: 135 
Weighting          : term frequency (tf)
> dtmImproved
A document-term matrix (591 documents, 10533 terms)

Non-/sparse entries: 43058/6181945
Sparsity           : 99%
Maximal term length: 135 
Weighting          : term frequency (tf)

推荐答案

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

这解决了问题！缺乏适当的文档确实使我生气(:

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

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