On Tue, Oct 9, 2012 at 10:35 AM, Jessica Streicher
<j.streic...@micromata.de> wrote:
> Can i somehow append objects to an .Rdata file?
>
> I didn't see an option for it in the save() method.
>
> dump() won't work since i have s4 objects in there.
I'm not sure I completely understand the issues you're trying to work
around, but I have two ideas for you. One is a simple pseudo-append
function that loads the entire contents, adds the object, and saves
the result. There are obviously memory issues with this strategy.
appendRData <- function(robj, filename) {
tmpEnv <- new.env()
savedObjects <- load(filename, envir = tmpEnv)
# quick check for name collisions
stopifnot(!(deparse(substitute(robj)) %in% savedObjects))
save(list = c(savedObjects, deparse(substitute(robj))),
file = filename,
envir = tmpEnv)
}
A second possibility is to convert your RData files to a lazy-load
database as described by Simon Urbanek here:
http://stackoverflow.com/questions/8700619/get-specific-object-from-rdata-file
http://stackoverflow.com/questions/6550510/examining-contents-of-rdata-file-by-attaching-into-a-new-environment-possible
HTH
James
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