For-Loop中的For-Loop似乎会跳过迭代(r) [英] For-Loop in For-Loop appears to skip iterations (r)

问题描述

我正在尝试在for循环中运行for循环，但是它的行为不符合我的预期.我希望它会循环遍历内部"循环中的元素，然后交换到外部"循环中的下一个元素并重复.

I am trying to run a for loop in a for loop, however it doesn't behave in the way I expect. I would expect it to cycle through the elements in the 'inner' loop, and then swap to the next element in the 'outer' loop and repeat.

例如

Letters = c('AA', 'BB', 'CC', 'DD')

for(i in 1:length(Letters)) {

  LetDup <- Letters

  for(i in 1:length(LetDup)) {

    Combined <- paste0(Letters[i], ' vs ', LetDup[i])

    print(Combined)

  }
}

我期望得到

AA vs AA
AA vs BB
AA vs CC
AA vs DD
BB vs AA 
BB vs BB
.....

我该如何表明这就是我想要的，如果有人可以对我实际要求它做的事情提供简单的解释，那也将有所帮助.

How do I indicate that this is what I would like, and if someone could offer a simple explanation of what I've actually asked it to do, that would help as well.

推荐答案

如果您坚持使用循环，请引用@Dason的注释并执行以下操作:

If you insist on using loops, take @Dason's comment and do the following:

for(i in 1:length(Letters)) {
  for(j in 1:length(Letters)) {
    Combined <- paste0(Letters[i], ' vs ', Letters[j])
    print(Combined)
    }
}

这篇关于For-Loop中的For-Loop似乎会跳过迭代(r)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！