计算一个向量值在另一个向量中的出现 [英] Count the occurrence of one vector's values in another vector

问题描述

我有2个向量

v1 <- c(164,38,20,19,163,22,21,4) 
v2 <- c(0,21,164,60,59,58,57,22,5,3,164,38,22,20,4,164,38,20,19,3,4,19,20,164,21,3,4,19,22,20,164,163,20,19,3)

我会我想对向量2中向量1中数字的出现进行计数。
我尝试使用循环来执行此操作，但是由于表的格式，它并没有完全起作用。

I would like to count the occurrence of the numbers in vector 1 in vector 2. I tried to do it with a loop but it didn't quite worked because of the format of the table.

a<-table(v2)
occurrence<-numeric()
for(i in v1){
   occurrence[i]<-a[names(a)==v1[i]]
}
occurSum<-sum(occurrence)

您知道一种最好不使用循环的方法吗？

Do you know a way to do this preferably without using a loop?

推荐答案

也许您正在寻找类似表和％in％：

Perhaps you are looking for something like a combination of table and %in%:

> table(v2[v2 %in% v1])

  4  19  20  21  22  38 163 164 
  3   4   5   2   3   2   1   5 

或者，根据您的尝试，您可以尝试：

Or, building on your attempt, you might try:

tv2 <- table(v2)
tv2[match(v1, names(tv2))]

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