[R] Sort matrix by column 1 ascending then by column 2 decending

Paul Geeleher paulgeeleher at gmail.com
Wed May 27 14:39:23 CEST 2009

I've got a matrix with 2 columns and n rows. I need to sort it first
by the values in column 1 ascending. Then for values which are the
same in column 1, sort by column 2 decending. For example:

2 .5
1 .3
1 .5
3 .2

Goes to:

1 .5
1 .3
2 .5
3 .2

This is easy to do in spreadsheet programs but I can't seem to work
out how to do it in R and haven't been able to find a solution



Paul Geeleher
School of Mathematics, Statistics and Applied Mathematics
National University of Ireland

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