[R] Re order variables in a dataframe

[pgseye]

Thanks Simon,

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.

Thanks,

Paul

Simon Blomberg-4 wrote:
> 
> Alphabetically, like this?:
> 
>> dat <- data.frame(d=rnorm(3), c=rnorm(3), b=rnorm(3), a=rnorm(3))
>> dat
>            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))]
>> dat2
>           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
>> 
> 
> Cheers,
> 
> Simon.
> 
> 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
>> easy
>> way to reorder the variables (columns) in a dataframe (I can't seem to
>> find
>> 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.
>> 
>> Thanks,
>> 
>> Paul
> -- 
> Simon Blomberg, BSc (Hons), PhD, MAppStat. 
> Lecturer and Consultant Statistician 
> School of Biological Sciences
> The University of Queensland 
> St. Lucia Queensland 4072 
> Australia
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> T: +61 7 3365 2506
> http://www.uq.edu.au/~uqsblomb
> email: S.Blomberg1_at_uq.edu.au
> 
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> 
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