R-help@stat.math.ethz.ch
Rhett Eckstein <[EMAIL PROTECTED]> a écrit : Dear R users:
> s4 <- seq(length=10, from=1, by=5)
> s<-data.frame(s4,s4,s4)
I would like to do some modification to s.
And I want the form like the following,if it is possible, how should I do?
The last column is the sum of previous three column.
s4 s4.1 s4.2 sum
1 1 1
2 6 6
3 11 1 12
4 16 6 22
5 21 11 1 33
6 26 16 6 48
7 31 21 11 63
8 36 26 16 78
9 41 31 21 93
10 46 36 26 108
Thanks for any help !!
see about NA/na/...
in s4.2 do something like s4.2[1:2]<-NA
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