[R] How to sort a matrix or dataframe by two columns?

Gábor Csárdi csardi at rmki.kfki.hu
Fri Feb 6 23:37:30 CET 2009

Yes, you can:

m <- matrix( sample(1:5, 20, rep=TRUE), nc=2)
m[ order(m[,1],m[,2]), ]


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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Gabor Csardi <Gabor.Csardi at unil.ch>     UNIL DGM

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