Hi Lille, Is it possible you're looking for tracemem() or inspect() ?
> x <- data.frame(z = 1:10)> tracemem(x)[1] "<0x55aa743e0bc0>" > x[1] <- 2Ltracemem[0x55aa743e0bc0 -> 0x55aa778f6ad0]: tracemem[0x55aa778f6ad0 -> 0x55aa778f6868]: [<-.data.frame [<- tracemem[0x55aa778f6868 -> 0x55aa778f5b48]: [<-.data.frame [<- > .Internal(inspect(x)) @55aa743e0bc0 19 VECSXP g0c1 [OBJ,MARK,NAM(7),TR,ATT] (len=1, tl=0) @55aa7440d420 13 INTSXP g0c0 [MARK,NAM(7)] 1 : 10 (compact) ATTRIB: @55aa743f9ea0 02 LISTSXP g0c0 [MARK] TAG: @55aa72ac98a0 01 SYMSXP g0c0 [MARK,NAM(7),LCK,gp=0x6000] "names" (has value) @55aa743e0fb0 16 STRSXP g0c1 [MARK,NAM(7)] (len=1, tl=0) @55aa72be1c70 09 CHARSXP g0c1 [MARK,gp=0x61] [ASCII] [cached] "z" TAG: @55aa72ac9d70 01 SYMSXP g0c0 [MARK,NAM(7),LCK,gp=0x4000] "class" (has value) @55aa73ca59b8 16 STRSXP g0c1 [MARK,NAM(7)] (len=1, tl=0) @55aa72b562b8 09 CHARSXP g0c2 [MARK,gp=0x61,ATT] [ASCII] [cached] "data.frame" TAG: @55aa72ac9670 01 SYMSXP g0c0 [MARK,NAM(7),LCK,gp=0x4000] "row.names" (has value) @55aa743e1c98 13 INTSXP g0c1 [MARK,NAM(7)] (len=2, tl=0) -2147483648,-10 On Thu, Jan 9, 2020 at 6:48 AM lille stor <lille.s...@gmx.com> wrote: > Hello, > > I would like for my C function to be able to manipulate some values stored > in an R data frame. > > To achieve this, a need the (real) memory address where the R data frame > stores its data (hopefully in a contiguous way). Then, from R, I call the C > function and passing this memory address as a parameter. > > The question: how can we get the memory address of the R data frame? > > Thank you! > > L. > > ______________________________________________ > 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
