Question

I made a data.frame in R that is not very big, but it takes quite some time to build. I would to save it as a file, which I can than again open in R?

Answer 1

There are several ways. One way is to use save() to save the exact object. e.g. for data frame foo:

save(foo,file="data.Rda")

Then load it with:

load("data.Rda")

You could also use write.table() or something like that to save the table in plain text, or dput() to obtain R code to reproduce the table.