[R] R matrix sorting question
Tuszynski, Jaroslaw W.
JAROSLAW.W.TUSZYNSKI at saic.com
Thu May 19 20:30:05 CEST 2005
Try:
> A=matrix(c(1,3,4,5,7, -0.2, 0.8, 0.3, 0.2, 0.9 ),5,2)
> A
[,1] [,2]
[1,] 1 -0.2
[2,] 3 0.8
[3,] 4 0.3
[4,] 5 0.2
[5,] 7 0.9
> A[order(A[,2]), ]
[,1] [,2]
[1,] 1 -0.2
[2,] 5 0.2
[3,] 4 0.3
[4,] 3 0.8
[5,] 7 0.9
Jarek
====================================================\=======
Jarek Tuszynski, PhD. o / \
Science Applications International Corporation <\__,|
(703) 676-4192 "> \
Jaroslaw.W.Tuszynski at saic.com ` \
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of
insu_paek at harcourt.com
Sent: Thursday, May 19, 2005 1:43 PM
To: R-help at stat.math.ethz.ch
Subject: [R] R matrix sorting question
Dear there,
I am trying to do the following stuff. Could you let me know how to do
it efficiently?
> aaa
[,1] [,2]
[1,] 1 -0.2
[2,] 3 0.8
[3,] 4 0.3
[4,] 5 0.2
[5,] 7 0.9
And I would like to sort the matrix by column 2 (and accordingly column 1
sorted as well).
The desired matrix will be
1 -0.2
5 0.2
4 0.3
3 0.8
7 0.9
If using Excel or SAS, I can do this easily, but I couldn't figure out how
to do it in R.
Could you let me know the efficient way to do this ?
I appreciate if the solution or reply comes as quickly as possible.
Thank you very much.
Insu
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