Bug? Index output of C functions R_qsort_I and R_qsort_int_I is not modified
R_ext/Utils.h:void R_qsort_int_I(int *iv, int *II, int i, int j); The last 2 arguments are int, not int*. .C() passes pointers to vectors so you cannot call this function directly from .C(). -Bill On Thu, Apr 15, 2021 at 3:15 PM Evangelos Evangelou via R-help <
r-help at r-project.org> wrote:
Hi all. Reading the documentation of these two functions https://cran.r-project.org/doc/manuals/r-release/R-exts.html#Utility-functions "The ..._I() versions also return the sort.index() vector in I." I can't find anything in the documentation about sort.index(), but I'm guessing that I is the index that makes the input sorted, as in R's order(). However running the following code on R version 4.0.5 (2021-03-31) Platform: x86_64-pc-linux-gnu (64-bit) does not give me that. It just gives me the original input. Rlib = file.path(Sys.getenv("R_HOME"), "lib", paste0("libR", .Platform$dynlib.ext)) dyn.load(Rlib) n = 4L ix = n:1 i = integer(n) cc = .C("R_qsort_int_I", ix, i, 1L, n) cc[[2]] I expect 4 3 2 1, but I get 0 0 0 0. Is this a bug or have I misunderstood something? Best, Vangelis [[alternative HTML version deleted]]
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