如何将R中的两列与特定符号合并? [英] How to merge two columns in R with a specific symbol?

问题描述

我有一个在R中读取的表，如下所示:

I have a table read in R as follows:

column1 column2
A        B

将两列匹配如下的命令是什么?

What is the command to be used to match two columns together as follows?

Column 3
A_B

推荐答案

我有点不确定合并"的意思，但这是您的意思吗?

I'm a bit unsure what you mean by "merge", but is this what you mean?

> DF = data.frame(A = LETTERS[1:10], B = LETTERS[11:20])
> DF$C = paste(DF$A, DF$B, sep="_")
> head(DF)
  A B  C
1 A K A_K
2 B L B_L
3 C M C_M
4 D N D_N

或等效地，如@daroczig指出的:

Or equivalently, as @daroczig points out:

 within(DF, C <- paste(A, B, sep='_'))

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