Message-ID: <d70c15d40902061437v73cbd5a7sc876b9d7c966725b@mail.gmail.com>
Date: 2009-02-06T22:37:30Z
From: Gábor Csárdi
Subject: How to sort a matrix or dataframe by two columns?
In-Reply-To: <408985.54792.qm@web52812.mail.re2.yahoo.com>
Yes, you can:
m <- matrix( sample(1:5, 20, rep=TRUE), nc=2)
m[ order(m[,1],m[,2]), ]
Gabor
On Fri, Feb 6, 2009 at 11:29 PM, Bill Hyman <billhyman1 at yahoo.com> wrote:
> Dear all,
>
> I have a matrix data and would like to sort it by col 1 first and then sort it by col 2. Can I do it in R? Thanks a lot!
>
> Bill
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Gabor Csardi <Gabor.Csardi at unil.ch> UNIL DGM