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
How to sort a matrix or dataframe by two columns?
3 messages · Gábor Csárdi, Bill Hyman
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
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help 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
Gabor, Thank you very much! Bill ----- Original Message ---- From: G?bor Cs?rdi <csardi at rmki.kfki.hu> To: Bill Hyman <billhyman1 at yahoo.com> Cc: r-help at 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 <- 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
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help 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