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

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 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide

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

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 billhym...@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

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

Gabor, Thank you very much! Bill - Original Message From: Gábor Csárdi csa...@rmki.kfki.hu To: Bill Hyman billhym...@yahoo.com Cc: r-help@r-project.org Sent: Friday, February 6, 2009 2:37:30 PM Subject: Re: [R] How to sort a matrix or dataframe by two columns? Yes, you can: m -