Try this:
Reduce("-", as.data.frame(embed(A$P, 2)))
On Tue, Mar 30, 2010 at 10:15 AM, Niklaus Hurlimann
<niklaus.hurlim...@unil.ch> wrote:
> Hi R mailing list,
>
> probably a very basic problem here, I try to do the following:
>
>> Q<-c(1,2,3)
>> P<-c(4,5,6)
>> A<- data.frame(Q,P)
>> A
> Q P
> 1 1 4
> 2 2 5
> 3 3 6
>
> this is my simplified data.frame (matrix) now I try to create following
> loop for subtraction of element within the data.frame:
>
>> for(i in length(A[,"P"]-1){
> delta[i]<- A[i,"P"]-A[i+1,"P"]
> }
>
> All I get is a vector of the correct length but with no readings.
>
> Thanks for any help on this.
>
>
>
> --
> Niklaus Hürlimann
>
> Université de Lausanne
> Institut de Minéralogie et Géochimie
> L'Anthropole
> CH-1015 Lausanne
> Suisse
>
> E-mail: niklaus.hurlim...@unil.ch
> Tel:+41(0)21 692 4452
>
> [[alternative HTML version deleted]]
>
>
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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