On 08/12/14 21:18, Ragia Ibrahim wrote:
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?
(1) Learn to use R. This is very basic; read some introductory
material. Start with "An Introduction to R" from the R web site.
This is analogous to the assertion that you shouldn't be driving a car
if you haven't a clue how to drive.
(2) Try:
X$z <- cumsum(X$y)
where X is the data frame in question.
cheers,
Rolf Turner
--
Rolf Turner
Technical Editor ANZJS
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