I was looking for a function which would take the difference along a vector?>a<-c(1,12,23,44,15,28,7,8,9,10)if I set the number difference to 3 would return 43 2 5 -37 -7 -19 3 or do I need to write my own function for this. -- View this message in context: http://r.789695.n4.nabble.com/difference-along-a-vector-tp2196594p2196594.html Sent from the R help mailing list archive at Nabble.com.
On May 12, 2010, at 2:06 PM, Clark Johnston wrote:> > I was looking for a function which would take the difference along a vector? >> a<-c(1,12,23,44,15,28,7,8,9,10) > if I set the number difference to 3 would return > 43 > 2 > 5 > -37 > -7 > -19 > 3 > > or do I need to write my own function for this.?diff> diff(a, lag = 3)[1] 43 3 5 -37 -7 -19 3 HTH, Marc Schwartz
?diff and look at argument 'lag'. On 2010-05-12 13:06, Clark Johnston wrote:> > I was looking for a function which would take the difference along a vector? >> a<-c(1,12,23,44,15,28,7,8,9,10) > if I set the number difference to 3 would return > 43 > 2 > 5 > -37 > -7 > -19 > 3 > > or do I need to write my own function for this.-- Peter Ehlers University of Calgary
help.search("difference")
would lead you to
?diff, see the lag argument
Clark Johnston wrote:> I was looking for a function which would take the difference along a
vector?
>> a<-c(1,12,23,44,15,28,7,8,9,10)
> if I set the number difference to 3 would return
> 43
> 2
> 5
> -37
> -7
> -19
> 3
>
> or do I need to write my own function for this.
Try this: n <- 3 apply(embed(a, n + 1)[,c(1, n + 1)], 1, diff) On Wed, May 12, 2010 at 4:06 PM, Clark Johnston <clarkstat@clarktx.com>wrote:> > I was looking for a function which would take the difference along a > vector? > >a<-c(1,12,23,44,15,28,7,8,9,10) > if I set the number difference to 3 would return > 43 > 2 > 5 > -37 > -7 > -19 > 3 > > or do I need to write my own function for this. > -- > View this message in context: > http://r.789695.n4.nabble.com/difference-along-a-vector-tp2196594p2196594.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >-- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]