A generic S3 function for somehting long. This function dispatches to S3 methods in preorder() and performs no input validation. If you supply NA values or vectors of unequal length (e.g. length(x) != length(y)), the underlying C++ code may trigger undefined behavior and crash your R session.
Because preorder() operates on raw pointers, pointer-level faults (e.g. from NA or mismatched length) occur before any R-level error handling. Wrapping calls in try() or tryCatch() will not prevent R-session crashes.
To guard against this, wrap preorder() in a “safe” validator that checks for NA values and matching length, for example:
safe_preorder <- function(x, y, ...) {
stopifnot(
!anyNA(x), !anyNA(y),
length(x) == length(y)
)
preorder(x, y, ...)
}
## Generic S3 method
## for Preorder Matrices
preorder(...)A container of sorted indices
Other Utilities:
presort()