# [R] How can I get the difference seq directly?

=?gb2312?B?uePQxw==?= guangxing at ict.ac.cn
Sat Nov 26 05:28:14 CET 2005

```Thank you very much.

I have tried as follow:
y<-x[2:length[x]]-x[1:(length[x]-1)]

apparently, it is not better than the "diff".

Thank you again.
======= 2005-11-26 12:19:32 ÄúÔÚÀ´ÐÅÖÐÐ´µÀ£º=======

>?diff
>
>y <- diff(x)
>
>HTH,
>
>--sundar
>
>¹ãÐÇ wrote:
>> Hi, R-help,
>> let x<-rnorm(1000),
>> now I want to get a sequence y,which is satisfied with as follow:
>>  y[1]<-x[2]-x[1]
>>  y[2]<-x[3]-x[2]
>>  ....
>>  y[999]<-x[1000]-x[999]
>>
>> Is there a function in R could achieve this requirement directly?
>>
>> Thank you in advance!
>>
>>
>>
>>
>>
>> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ÖÂ
>> Àñ£¡
>>
>>
>> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¹ãÐÇ
>> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡guangxing at ict.ac.cn
>> ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2005-11-26
>>
>>
>>
>> ------------------------------------------------------------------------
>>
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>

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¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¹ãÐÇ
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡guangxing at ict.ac.cn
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2005-11-26

```