比较R中的两个字符向量 [英] Compare two character vectors in R

问题描述

我有两个ID的字符向量.

I have two character vectors of IDs.

我想比较两个字符向量，尤其是我对以下图形感兴趣:

I would like to compare the two character vectors, in particular I am interested in the following figures:

• A和B中都有多少个ID
• A中有多少ID，但B中没有多少
• B中有多少ID，但A中没有多少

我也很想画一个维恩图.

I would also love to draw a Venn diagram.

推荐答案

以下是一些可以尝试的基础知识:

Here are some basics to try out:

> A = c("Dog", "Cat", "Mouse")
> B = c("Tiger","Lion","Cat")
> A %in% B
[1] FALSE  TRUE FALSE
> intersect(A,B)
[1] "Cat"
> setdiff(A,B)
[1] "Dog"   "Mouse"
> setdiff(B,A)
[1] "Tiger" "Lion" 

类似地，您可以简单地得到计数:

Similarly, you could get counts simply as:

> length(intersect(A,B))
[1] 1
> length(setdiff(A,B))
[1] 2
> length(setdiff(B,A))
[1] 2

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