There may be more efficient ways, but
unique(t(apply(h, 1, sort)))
does what I think you want.
Patrick Burns
Burns Statistics [EMAIL PROTECTED] +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and "A Guide for the Unwilling S User")
dax42 wrote:
Dear list,
I would like to extract from a matrix all those rows, that are unique.
By unique, I don't mean the unique that is accomplished by the function unique(), though...
Consider the following example: > h [,1] [,2] [1,] 4 4 [2,] 1 4 [3,] 4 1
Now unique(h) returns exactly the same - because 1 4 and 4 1 is not the same for that function.
What I would like to see, though, are only the first two rows (or the first and the third, it does not matter).
Does anybody know how to do that? Cheers, Dax.
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