Test if an object is not sorted (in increasing order), without the cost of sorting it.
is.unsorted(x, na.rm = FALSE, strictly = FALSE)
an R object with a class or a numeric, complex, character, logical or raw vector.
logical. Should missing values be removed before checking?
logical indicating if the check should be for strictly increasing values.
is.unsorted is generic: you can write methods to handle
specific classes of objects, see InternalMethods.
A length-one logical value. All objects of length 0 or 1 are sorted.
Otherwise, the result will be
NA except for atomic vectors and
objects with an S3 class (where the
> method is
used to compare
2:length(x)) or with an S4 class where you have to provide a
This function is designed for objects with one-dimensional indices, as described above. Data frames, matrices and other arrays may give surprising results.
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