R help - May 2005 - data frame output in loops

I know this is very basic--I'm wondering if there is a  way to write data
frames as outputs from a loop.
In other words, take this simple example:
 
> a <- data.frame(x = c(1,2,3,4), y = c(1,2,1,2))
 
Given a, how would you write a loop that creates two data frames, x and y, where
the first column is a column of a and the second column is two times the first
column, or:
 
> x
  x.1 x.2
1   1   2
2   2   4
3   3   6
4   4   8

 
and 
 
> y
  y.1 y.2
1   1   2
2   2   4
3   1   2
4   2   4

 


DISCLAIMER: This e-mail message and any attachments are inte...{{dropped}}

No need for computer-intensive loops.  Try the following:

a <- data.frame(x = c(1,2,3,4), y = c(1,2,1,2))
xx=data.frame(x.1=a[,1],x.2=2*a[,1])
yy=data.frame(y.1=a[,2],y.2=2*a[,2])

Cheers

Francisco

>From: "Apoian, Zack" <Zack.Apoian at sac.com>
>To: <r-help at stat.math.ethz.ch>
>Subject: [R] data frame output in loops
>Date: Fri, 6 May 2005 14:56:21 -0400
>
>I know this is very basic--I'm wondering if there is a  way to write
data
>frames as outputs from a loop.
>In other words, take this simple example:
>
> > a <- data.frame(x = c(1,2,3,4), y = c(1,2,1,2))
>
>Given a, how would you write a loop that creates two data frames, x and y, 
>where the first column is a column of a and the second column is two times 
>the first column, or:
>
> > x
>   x.1 x.2
>1   1   2
>2   2   4
>3   3   6
>4   4   8
>
>
>and
>
> > y
>   y.1 y.2
>1   1   2
>2   2   4
>3   1   2
>4   2   4
>
>
>
>
>DISCLAIMER: This e-mail message and any attachments are inte...{{dropped}}
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide! 
>http://www.R-project.org/posting-guide.html