preorder.matrix {SLmetrics} | R Documentation |
Preorder Matrices
Description
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.
Defensive measures
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, ...) }
Usage
## S3 method for class 'matrix'
preorder(x, decreasing = FALSE, ...)
Arguments
x |
A <matrix> to be sorted |
decreasing |
A <logical> |
... |
Arguments passed into other methods |
Value
A <matrix> of same dimensions as the input <matrix>
See Also
Other Utilities:
presort()