如何在R中两个不同长度的向量上找到公共元素？

Question

I need to find common elements in 2 different length vectors. 我需要在2个不同的长度向量中找到共同的元素。

For example, I have a vector A with 10 elements, and a vector B with 3 elements. 例如，我有一个包含10个元素的向量A和一个包含3个元素的向量B。

I need get the position of which elements in A is equal to B. 我需要确定A中哪些元素等于B的位置。

A=c(1,2,45,3,10,5,11,13,6,7)

B=c(45,3,10)

C would be [3,4,5] C为[3,4,5]

I have already tried "match" and "intercept" functions, but no success :( 我已经尝试过“匹配”和“拦截”功能，但是没有成功:(

Thanks a lot! 非常感谢！ :) :)

Answer 1

You can use which function. 您可以使用which功能。

> which(A %in% B)
[1] 3 4 5