Ramon Diaz-Uriarte wrote: > Dear All, > > In a package, I am using ".C" to call some C functions. In one case, > the number of elements of the return vectors are not known in R before > the C call. (Two of the vectors are integers, the third is vector of > character strings). > > Passing from R a vector of the maximum possible size would be a huge > waste. I understand one alternative is to use ".Call", but I'd rather > avoid it if I can (all of the code seems working except for the return > of values into R). Another would be to write to a file from C and then > read that into R, but this looks very ugly. Are there any other > reasonable alternatives, or should I just use .Call? >
.Call is usually easiest, but another possibility is to have two entry points: one to calculate how much space you need, a second to pass in a vector that's the right size to hold the result. Duncan Murdoch > Thanks, > > R. > > > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
