Jiefei, Where does the code for your altrep class live?
Thanks, ~G On Wed, Oct 7, 2020 at 4:25 AM Jiefei Wang <szwj...@gmail.com> wrote: > Hi all, > > The coercion function defined for the ALTREP object will not be called by R > when an assignment operation implicitly introduces coercion for a large > ALTREP object. > > For example, If I create a vector of length 10, the ALTREP coercion > function seems to work fine. > ``` > > x <- 1:10 > > y <- wrap_altrep(x) > > .Internal(inspect(y)) > @0x000000001f9271c0 13 INTSXP g0c0 [REF(2)] I am altrep > > y[1] <- 1.0 > Duplicating object > Coercing object > > .Internal(inspect(y)) > @0x000000001f927c08 14 REALSXP g0c0 [REF(1)] I am altrep > ``` > > However, if I create a vector of length 1024, R will give me a normal > real-type vector > ``` > > x <- 1:1024 > > y <- wrap_altrep(x) > > .Internal(inspect(y)) > @0x000000001f8ddb20 13 INTSXP g0c0 [REF(2)] I am altrep > > y[1] <- 1.0 > > .Internal(inspect(y)) > @0x000000001f0d72a0 14 REALSXP g0c7 [REF(1)] (len=1024, tl=0) 1,2,3,4,5,... > ``` > > Note that the duplicate function is also called for the first example. It > seems like R completely ignores my ALTREP functions in the second example. > I feel this might be designed on purpose, but I do not understand the > reason behind it. Is there any reason why we are not consistent here? Here > is my session info > > sessionInfo() > R Under development (unstable) (2020-09-03 r79126) > Platform: x86_64-w64-mingw32/x64 (64-bit) > Running under: Windows 10 x64 (build 18362) > > Best, > Jiefei > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
