R DocumentTermMatrix控件列表不起作用,默默地忽略未知参数

Question

我有两个以下DTM-s:

dtm <- DocumentTermMatrix(t)

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

当我实现这个时,我看到两个相同的DTM-s,如果我打开它dtmImproved,就会有3个符号的单词.为什么minWordLength参数不起作用？谢谢!

> 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)

Answer 1

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

这解决了这个问题!缺乏适当的文件确实让我失望(: