与语言R匹配以获取位置 [英] match with language R for getting the position

问题描述

我正在使用match获取元素是否在列表中.例如，我的列表是:

I am using match for getting if an element is in a list. For example my list is:

  c("a","b","h","e"...) and so on

如果我想查看元素h是否在列表中，我将以这种方式使用match:

if I want to see if element h is in the list I am using match in this way:

  if ("h" %in% v){do something}

如何获取在列表中找到元素的位置? 谢谢

How I can get the position of where it finds the element in the list? Thanks

推荐答案

如果您想知道位置，请使用which

If you want to know the position use which

l <- c("a","b","h","e")
which(l=='h') 
[1] 3   # It'll give you the position, 'h' is the third element of 'l'

请注意，l是向量，而不是您提到的列表.

Note that l is a vector, not a list as you mentioned.

这篇关于与语言R匹配以获取位置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！