[R] Sorting a matrix?

Thomas Lumley tlumley at u.washington.edu
Fri Dec 7 21:18:31 CET 2001

On Fri, 7 Dec 2001, Duncan Murdoch wrote:

> I'd like to sort the rows of a matrix, sorting by the values in the
> 1st column, breaking ties by the 2nd, etc.  I don't know in advance
> how many columns there'll be.
> Is there a way to force the unknown number of columns of my matrix to
> be the ... arguments of order(), or is there another way to do this
> (other than a loop)?

You should be able to do this with do.call(), which takes a function name
and a list of arguments.  Something like

do.call("order",lapply(1:NCOL(m) function(i) m[,i]))


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