Message-ID: <Pine.GSO.4.31.0101121840390.22322-100000@auk.stats>
Date: 2001-01-12T18:42:48Z
From: Brian Ripley
Subject: sorting ascending descending?
In-Reply-To: <Pine.LNX.4.21.0101121937200.32029-100000@artemis.imbe.med.uni-erlangen.de>
On Fri, 12 Jan 2001, Torsten Hothorn wrote:
>
> > HI!
> > By xx[order(xx)] I can sort the array ascendin. How to sort them
> > descending.
> >
> > eg.:
> > > a<-c(2,3,110,23,4)
> > > a[order(a)]
> > [1] 2 3 4 23 110
> >
> > but i wont.
> > [1] 110 23 4 3 2
>
> rev(a[order(a)]
>
Or a[rev(order(a))], which is useful if you want to sort arrays not
vectors (just add a comma or two).
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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