[R] combine two dataframe

[Greg Snow]

Here is another approach:

> tmp <- expand.grid( 1:nrow(B), 1:nrow(A) )
> out <- cbind( A[tmp[,2],], B[tmp[,1],] )

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of sun
> Sent: Tuesday, November 13, 2007 4:50 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] combine two dataframe
> 
> I have two data frame A and B adn want to cross them.
> A has format as: 
> 
> a1  a2 a3
> 1   2    3
> 2   3    1
> 1   3    2
> ...
> 
> B:
> 
> b1 b2
> 1   2 
> 2   1
> ...
> 
> the combine result shall be something like
> 
> a1 a2 a3 b1 b2
> 1   2   3   1  2
> 1   2   3   2  1
> 2   3   1   1  2
> 2   3   1   2  1
> 1   3   2   1  2
> 1   3   2   2  1
> ....
> 
> 
> is there a function able of doing this instead of  loops?
> 
> Thanks,
> Sun
> 
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