[R] combine two dataframe

[sun]

Thanks all for the answers. Both Merge and sqldf works perfectly for me. 
Well, I feel sqldf run a littile bit slower. And I failed to install this 
package (sqldf ) on my linux box.

Denver, your approach also works, but in my case, data frame A has much more 
rows then B, so B has to be duplicated many many times.

kind regards,
Sun

----- Original Message ----- 
From: "Gabor Grothendieck" <ggrothendieck at gmail.com>
To: "sun" <flyhyena at yahoo.com.cn>
Cc: <r-help at stat.math.ethz.ch>
Sent: Tuesday, November 13, 2007 6:07 PM
Subject: Re: [R] combine two dataframe


> Try this:
>
>> A <- data.frame(a1 = c(1, 2, 1), a2 = c(2, 3, 3), a3 = c(3, 1, 2))
>> B <- data.frame(b1 = 1:2, b2 = 2:1)
>>
>> library(sqldf)
>> sqldf("select * from A, B")
>  a1 a2 a3 b1 b2
> 1  1  2  3  1  2
> 2  1  2  3  2  1
> 3  2  3  1  1  2
> 4  2  3  1  2  1
> 5  1  3  2  1  2
> 6  1  3  2  2  1
>
>
> On Nov 13, 2007 6:49 AM, sun <flyhyena at yahoo.com.cn> wrote:
>> 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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