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2018 Nov 15
2
STRING_IS_SORTED claims as.character(1:100) is sorted
If I have loaded the C code: SEXP altrep_STRING_IS_SORTED(SEXP x) { return ScalarInteger(STRING_IS_SORTED(x)); } and defined the function: issort <- function(x) .Call("altrep_STRING_IS_SORTED",x) I am seeing the following results in R 3.5.1/Linux: > issort(LETTERS) [1] NA > issort(as.character(1:100)) ## should return NA [1] 1 > issort(as.character(100:1)) ## should return NA [1] -1 > i...