R从数据框中的句子中删除单词 [英] R remove words from sentences in dataframe

问题描述

我有一个包含两列的数据框，每列包含句子，我想从另一列中减去一列.我以某种方式无法轻松找到执行以下操作的方法:

I have one dataframe with two columns which each containing sentences and I would like to subtract one from the other. I somehow can't easily find a method to do the following:

> c1 <- c("A short story","Not so short")
> c2 <- c("A short", "Not so")
> data.frame(c1, c2)

应该给出 c1 - c2 的结果

which should give the result of c1 - c2

"story","short"

任何想法都有帮助.

推荐答案

我们可以使用矢量化的 str_remove

We can use str_remove which is vectorized

library(stringr)
library(dplyr)
df1 %>%
   mutate(c3 = str_remove_all(c1, c2))
         c1      c2     c3
#1 A short story A short  story
#2  Not so short  Not so  short

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