[Rd] Don't dput() data frames?
simon.urbanek at r-project.org
Tue Aug 28 20:00:00 CEST 2012
On Aug 28, 2012, at 1:51 PM, R. Michael Weylandt wrote:
> /src/main/attrib.c contains this comment in row_names_gets():
> /* This should not happen, but if a careless user dput()s a
> data frame and sources the result, it will */
> which svn blame says Prof Ripley placed there in r39830 with the
> commit message "correct the work of dput() on the row names of a data
> frame with compact representation."
> Is there a problem / better way to use the result of a hefty dput than
> source()ing it?
It's pretty much the least efficient and most dangerous (as in insecure) way. That's why there is serialization instead ...
> This seems to work rather robustly:
> source(textConnection(paste0("iris2 <- ", capture.output(dput(iris)))))
> identical(iris, iris2)
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