Message-ID: <43FF14D4.5030101@optonline.net>
Date: 2006-02-24T14:14:44Z
From: Chuck Cleland
Subject: Sorting a dataframe by one column?
In-Reply-To: <e40d78ce0602240554x322a356era72fa63923e32961@mail.gmail.com>
mtb954 mtb954 wrote:
> Given the following dataframe:
>
> A=1:10
> B=(a-5)^2
> DATAFRAME=data.frame(A,B)
>
> How can I sort DATAFRAME increasing (or decreasing, for that matter)
> by B without making reference to A, or any other column?
>
> I've read ?order and ?sort but cannot seem to figure this out.
You should have tried RSiteSearch("sort dataframe") also, since there
are many examples in the archives of R-help.
A=1:10
B=(A-5)^2
mydata=data.frame(A,B)
mydata[order(mydata$B),]
mydata[rev(order(mydata$B)),]
--
Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
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