检查 R 中的向量是否是顺序的? [英] Check whether vector in R is sequential?

问题描述

如何检查整数向量是否是连续的"，即后续元素之间的差值恰好为 1.我觉得我缺少诸如is.sequential"之类的东西

How can I check whether an integer vector is "sequential", i.e. that the difference between subsequent elements is exactly one. I feel like I am missing something like "is.sequential"

这是我自己的函数:

is.sequential <- function(x){
    all(diff(x) == rep(1,length(x)-1))
}    

推荐答案

不需要 rep 因为 1 将被重新定义:

There's no need for rep since 1 will be recicled:

编辑以允许 5:2 为真

Edited to allow 5:2 as true

is.sequential <- function(x){
  all(abs(diff(x)) == 1)
}  

允许不同的序列

is.sequential <- function(x){
 all(diff(x) == diff(x)[1])
}

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