计算另一个向量中向量的出现

Question

tweet<- c("boy","girl","boy","x")
unique_words<- c("asdfdd","boy","girl","ahmed","asdf","asfeertrt")
word_count<-table(tweet[tweet %in%unique_words])
word_occurence<- as.integer(unique_words%in% tweet)

我得到了这些输出:word_count ::

          boy girl 
           2    1

word_occurence ::

           0 1 1 0 0 0

但我希望输出如下:0 2 1 0 0 0

Answer 1

你可以这样做:

library(stringr)
rowSums(sapply(tweet, function(x, y) str_count(x, y), unique_words))
[1] 0 2 1 0 0 0

该命令循环遍历tweet向量,计算每个出现的次数(str_count(); stringr包),然后使用rowSums对数据进行求和.