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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