On 27.09.2023 09:35, Ivan Krylov wrote:
On Tue, 26 Sep 2023 20:00:03 +0000
Dario Strbenac <dstr7...@uni.sydney.edu.au> wrote:
Is it possible to somehow specify more complex return types, such as
a data.frame with specific columns?
Probably not with vapply(). It only looks at the equivalent of
typeof(), verifies the length() (which for data.frames is the number of
columns) and then combines the objects along the axis that you're not
interested in (building a list-matrix).
I've been using the do.call(rbind, lapply(...)) idiom, relying on
rbind.data.frame to check its arguments. It could probably be made more
efficient, but it does the job.
Or perhaps you simply look for defining a new class (I'd use S3) where
the output is a specific data frame (with some prefedined columns) to
which you assign a class attribute?
Best,
Uwe Ligges
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