[R] repeat series of commands for each variable

[Peter Kraglund Jacobsen]

For each variable x, y and z I would like to run the same set of
commands. I have tried

for (n in FICB[,"calct30"], FICB[, "calct60]") {
FICB[,"temp"] <- format([n],digits=2)
etc
}

How do I do this correctly?