[R] Re: [S] subscripts error

[Kenneth Cabrera]

Hi Gianluca:

try :

x2<-x[1:(length(x)-2)]-x[3:length(x)]
 OR
x2<-diff(x,lag=2)

Hope it helps.

Gianluca wrote:

> Hi all,
>  
> I'm back to use S-Plus after a lot programming with SAS, so it's hard 
> for me to face many simple problems....
> Let's come to what is going to make me crazy. I have a simple 1000 obs 
> time series, called "x".
> If I want to compute second order differences just typing:
> x2<-x[1:length(x)-2]-x[3:length(x)]
>  
> but I get the following error message:
>  
> Error in x[1:length(x) - 2]: Only 0's may be mixed with negative 
> subscripts
> Much more interesting is that with first order differences it works 
> perfectly....
> Thanks in advance to all.
>  
> Gianluca


-- 
Kenneth Roy Cabrera Torres
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