向量的相邻元素之间的差异 [英] Difference between neighbouring elements of a vector

问题描述

我不知道如何解决R的入门练习，所以练习是

I have no idea how to solve an introductory exercise to R, so the exercise is

使用相邻元素之间的所有99个差异创建向量zx的z使得z [1] = x [2] -x [1]，z [2] = x [3] -x [2]，.....

Create a vector z with all 99 differences between the neighbouring elements of x such that z[1]=x[2]-x[1], z[2]=x[3]-x[2], . . .

我猜它应该没有循环地工作.

I guess it is supposed to work without loops.

推荐答案

类似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] -没有第一个元素的向量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

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