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issor
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...