[R] ordering a matrix by multiple columns
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Mon Mar 18 19:15:21 CET 2002
Michael Dondrup <Michael.Dondrup at Genetik.Uni-Bielefeld.DE> writes:
> Dear all,
> is there an easy way to sort or get the order of a matrix or data.frame
> by multiple rows
> (like ODER BY in SQL), that means if some values in the first column are
> equal, then sort them (or 'order') by the second etc.?
Oder was? (Sorry)
The latter form is useful if d is called something longer than "d"...
The only mildly annoying thing is that you cannot (easily) sort
descending on character variables -- for numeric ones, just switch the
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
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~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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