[R] data frame cumulative row sum

[Rui Barradas]

Hello,

If your dataset is named 'dat', try

dat$z <- cumsum(dat$y)


Hope this helps,

Rui Barradas

Em 08-12-2014 08:18, Ragia Ibrahim escreveu:
> Hi,
> Kindly I had a data frame looks like this
> x y
> 1 3
> 2 2
> 3 1
> 4 3
> and I want to add column z that sum cumulativly like this
> x y z
> 1 3 3
> 2 2 5
> 3 1 6
> 4 3 9
>
> how to do this?
> Regards
> Ragia
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