R中向量中的字符相乘 [英] Multiplying characters in a vector in R

问题描述

假设我有矢量:

x = c("a","b","c")

我想创建一个返回以下内容的函数:

I would like to create a function that returns the following:

[1] "a*b" "a*c" "b*c"

我假设我们将使用paste0()函数或使用某种for循环遍历向量中的字符，但是我不确定如何执行此操作.为了清楚起见，我正在寻找一个输出，一次从向量中获取两个字符，并使用某种paste0(...，sep ="*")来获得上面期望的输出.我不想一次将向量中的所有字符相乘，一次只乘两个字符.

I assume we would use the paste0() function or use some sort of for loop to loop through the characters in the vector but I am not fully sure how to go about this. Just to clarify, I am looking for an output that takes two characters from the vector at a time and uses some sort of paste0(...,sep="*") to get the desired output above. I do not want to multiply all the characters in the vector at once, just two characters at a time.

推荐答案

我们可以使用 base R

combn(x, 2, FUN = paste, collapse="*")
#[1] "a*b" "a*c" "b*c"

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