[R] Re order variables in a dataframe
prseye at gmail.com
Thu May 21 05:39:10 CEST 2009
I should have explained myself better (although I didn't know about the
order function so that's handy information).
I've found a few times, I've added variables to a dataframe that I would
like to 'group' with variables earlier in the datset. So I was wondering if
you could somehow ask R, for example, to take that last variable and insert
it at a different position in the dataframe.
Simon Blomberg-4 wrote:
> Alphabetically, like this?:
>> dat <- data.frame(d=rnorm(3), c=rnorm(3), b=rnorm(3), a=rnorm(3))
> d c b a
> 1 -0.1816733 -0.4106008 -0.2855991 -1.022951
> 2 -1.8326818 -0.6515208 0.3344884 -2.191836
> 3 1.0924867 0.1159611 -1.3409719 1.195545
>> dat2 <- dat[,order(names(dat))]
> a b c d
> 1 -1.022951 -0.2855991 -0.4106008 -0.1816733
> 2 -2.191836 0.3344884 -0.6515208 -1.8326818
> 3 1.195545 -1.3409719 0.1159611 1.0924867
> On Wed, 2009-05-20 at 20:19 -0700, pgseye wrote:
>> This is no doubt a very basic question for most R users, but is there an
>> way to reorder the variables (columns) in a dataframe (I can't seem to
>> an answer anywhere). I've generally been creating a new dataframe and
>> selecting the new order I want from the old but this is time-consuming.
> Simon Blomberg, BSc (Hons), PhD, MAppStat.
> Lecturer and Consultant Statistician
> School of Biological Sciences
> The University of Queensland
> St. Lucia Queensland 4072
> Room 320 Goddard Building (8)
> T: +61 7 3365 2506
> email: S.Blomberg1_at_uq.edu.au
> 1. I will NOT analyse your data for you.
> 2. Your deadline is your problem.
> The combination of some data and an aching desire for
> an answer does not ensure that a reasonable answer can
> be extracted from a given body of data. - John Tukey.
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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