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How to sort a matrix or dataframe by two columns?

Bill Hyman 
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

Thread (3 messages)

Bill Hyman How to sort a matrix or dataframe by two columns? Feb 6 Gábor Csárdi How to sort a matrix or dataframe by two columns? Feb 6 Bill Hyman How to sort a matrix or dataframe by two columns? Feb 6