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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

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Hi, R users: I have built an package, and the package depends on two other packages, I want to install other two packages at the same time when I install my package, like the following form, > utils:::menuInstallPkgs() --- Please select a CRAN mirror for use in this session --- also installing the dependencies 'acepack', 'fBasics',.... Please give me some hints. I am