将字符串切成固定宽度字符元素的向量 [英] Chopping a string into a vector of fixed width character elements

问题描述

我有一个包含文本字符串的对象:

I have an object containing a text string:

x <- "xxyyxyxy"

我想把它分成一个向量，每个元素包含两个字母:

and I want to split that into a vector with each element containing two letters:

[1] "xx" "yy" "xy" "xy"

似乎 strsplit 应该是我的票，但由于我没有正则表达式 foo，我无法弄清楚如何让这个函数按照我想要的方式将字符串切成块它.我该怎么做?

It seems like the strsplit should be my ticket, but since I have no regular expression foo, I can't figure out how to make this function chop the string up into chunks the way I want it. How should I do this?

推荐答案

使用 substring 是最好的方法:

Using substring is the best approach:

substring(x, seq(1, nchar(x), 2), seq(2, nchar(x), 2))

但这里有一个 plyr 的解决方案:

But here's a solution with plyr:

library("plyr")
laply(seq(1, nchar(x), 2), function(i) substr(x, i, i+1))

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