R. Quanteda程序包如何过滤dfm_tfidf中存在的值？

问题描述

所以我有一个dfm_tfidf，我想过滤掉低于某个阈值的值。

代码：

dfmat2 <-
  matrix(c(1,1,2,3),byrow = TRUE,nrow = 2,dimnames = list(docs = c("document1","document2"),features = c("this","is","a","sample","another","example"))) %>%
  as.dfm()


#it works
dfmat2 %>% dfm_trim(min_termfreq = 3)

#it does not work
dfm_tfidf(dfmat2) %>% dfm_trim( min_termfreq = 1)
# "Warning message: In dfm_trim.dfm(.,min_termfreq = 1) : dfm has been previously weighted"

问题：如何过滤出dfm_tfidf中存在的值？

谢谢

解决方法

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