R中向量的相邻元素之间的差 [英] difference between neighboring elements of a vector in R

问题描述

很抱歉打扰您，但我不知道如何解决R的入门练习.(当然，在发布之前，我确实雄心勃勃地用Google搜索！). 所以练习是 创建具有相邻元素之间所有99个差异的向量z x的z使得z [1] = x [2] -x [1]，z [2] = x [3] -x [2]，.... . . 我猜它应该没有循环地工作. 我想这是很基础的，但是我对R还是陌生的.

I'm sorry to bother you but I have no idea how to solve an introductory exercise to R. (Of course I googled really ambitiously before posting!). So the exercise is "Create a vector z with all 99 differences between the neighboring elements of x such that z[1]=x[2]-x[1], z[2]=x[3]-x[2], . . . " I guess it is supposed to work without loops. I guess it's quite basic but i'm totally new to R.

感谢您的帮助

推荐答案

类似于diff函数的声音

Sounds like diff function

diff(x)

您也可以使用以下代码:

You can also use this code:

x[-1] - x[-length(x)]

x[-1]-不带第一个元素的向量x

x[-1] - vector x without first element

x[-length(x)]-不带最后一个元素的向量x

x[-length(x)] - vector x without last element

这篇关于R中向量的相邻元素之间的差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！