On Dec 9, 2009, at 10:10 PM, Peng Yu wrote:
I did a search on www.rseek.org to look for the function to test if a
vector is ordered or not. But I don't find it. Could somebody let me
know what function I should use?
If by ordered, you mean sorted, then ?is.unsorted
> is.unsorted(c(1, 4, 2, 6, 7))
[1] TRUE
> is.unsorted(sort(c(1, 4, 2, 6, 7)))
[1] FALSE
If you mean to test a factor to see if it is an ordered factor, then ?
is.ordered
> is.ordered(factor(letters))
[1] FALSE
> is.ordered(factor(letters, ordered = TRUE))
[1] TRUE
HTH,
Marc Schwartz
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