[R] inserting columns in the middle of a dataframe

[Christos Hatzis]

Sorry, I guess I did not explain at all how append 
could work in a one-liner:

data.frame(df, v5)[append(1:4,5,2)]

Your method is fine as well.  The above might be more
flexible if you need a more general solution, e.g. if you wanted
to make it a function.

-Christos

-----Original Message-----
From: Jon Minton [mailto:jm540 at york.ac.uk] 
Sent: Wednesday, September 13, 2006 6:43 PM
To: christos at nuverabio.com; r-help at stat.math.ethz.ch
Cc: 'Jon Minton'
Subject: RE: [R] inserting columns in the middle of a dataframe

Thanks, but isn't that only for elements in vectors?

I think I've found the following method to work:

e.g. for
df <- data.frame(v1,v2,v3,v4)

use:

df <- data.frame(df[1:2],v5,df[-c(1:2)])

I *believe* this is the one-line solution I was looking for. Can anyone see
why this wouldn't work?

Jon 



-----Original Message-----
From: Christos Hatzis [mailto:christos at nuverabio.com]
Sent: 13 September 2006 23:22
To: 'Jon Minton'; r-help at stat.math.ethz.ch
Subject: RE: [R] inserting columns in the middle of a dataframe

See ?append

-Christos 

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Jon Minton
Sent: Wednesday, September 13, 2006 5:14 PM
To: r-help at stat.math.ethz.ch
Cc: 'Jon Minton'
Subject: Re: [R] inserting columns in the middle of a dataframe

Dear R users:

 

Is there a built-in and simple way to insert new columns after other columns
in a dataframe?

 

I.e. currently I have:

 

V1 V2 V3 V4

[1,]

[2,]

Etc.

 

But I want 

                V1 V5 V2 V3 V4

[1,] 

[2,]

Etc.

 

Can this be done in one line?

 

Jon Minton

 

 


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