I am trying to write a C function to create a vector of integers that can be used by the R calling function. I do not know the size of the vector in the R calling function. (Well, actually, I have an upper limit on the size, but that is so large that R cannot allocate it. What I'm doing in the function is to do a sieving procedure, and the result will be small enough to fit into my machine's memory.)
My reading of sections 6.1.1 and 6.1.2 of the guide on writing R extensions has left me a bit confused. Under R_alloc, I read "R will reclaim the memory at the end of the call" which seems to suggest the storage won't be made available afterwards, so that's not what I should use. As for the alterntaive, under Calloc, I read "This memory lasts until freed by the user", and it's clear that this is to be done within the C function in question. Summary question: how can I allocate memory withing a C function, making it available to an R function that calls the C function? Thanks. Dan. -- View this message in context: http://www.nabble.com/S_alloc-or-Calloc-for-return-value-tp24579062p24579062.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.