[R] why order doesn't work?
Berend Hasselman
bhh at xs4all.nl
Fri Jul 27 22:52:15 CEST 2012
cowboy wrote
>
> hi all,
> I want to get a cumsum according to the order of some variable.
> However, it doesnt' work.
> For example,
> **********************
> test<-data.frame(cbind(x=c(3,5,2,6,7),y=c(8,1,4,9,0)))
> test[order(test$x),]$sumy<-cumsum(test[order(test$x),]$y)
> **********************
> R complians Warning message:
> In `[<-.data.frame`(`*tmp*`, order(test$x), , value = list(x = c(2, :
> provided 3 variables to replace 2 variables.
>
> while the following
> ***********************
> test$sumy<-cumsum(test[order(test$x),]$y)
> ******************
> gives
> x y sumy
> 1 3 8 4
> 2 5 1 12
> 3 2 4 13
> 4 6 9 22
> 5 7 0 22
>
> should it gives
>
> x y sumy
> 1 3 8 12
> 2 5 1 13
> 3 2 4 4
> 4 6 9 22
> 5 7 0 22
>
> What am I missing here?
>
order is working just fine.
Apparently one cannot create a new column in a data.frame with the $
notation.
This will work
test[order(test$x),"sumy"]<-cumsum(test[order(test$x),]$y)
Berend
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