Message-ID: <gieibvkfarihujm7hfvefmqd15ic1badv8@4ax.com>
Date: 2003-05-07T16:56:41Z
From: Duncan Murdoch
Subject: how to order a dataframe ?
In-Reply-To: <3EB9325B.4010906@ariase.com>
On Wed, 07 May 2003 18:20:43 +0200, you wrote in message
<3EB9325B.4010906 at ariase.com>:
>Hi,
>I've got a problem which seemed simple to me at first view, but which I
>haven't managed to solve yet. I have a dataframe, or a matrix, and I
>would like to order it along with one of the variables/columns. I tried
>to use order() but it remained quite unclear to me. How should I proceed ?
>Thanks in advance (I guess that's not very difficult a question for most
>of you)
Try something like this:
x <- matrix(rnorm(100),10,10)
s <- x[order(x[,1]),]
Now s is a copy of x sorted on the first column.
Duncan Murdoch