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1999 Jun 05
2
R: question about vectors + for loop
Hi,
first of all: I'm not only new to R, but also to S.
I hope this is the right forum for asking the following
very stupid questions:
a) is there a straightforward way of saying
for all factors f in a data frame {
any old function, e.g. max(f)
}
b) how can you construct a new data frame d' from
a given data frame d which contains only rows
with [X=="A"] (x is