R help - Apr 2006 - about "intersection set" and "union set"

This was just discussed recently.  See the following thread:

http://tolstoy.newcastle.edu.au/R/help/06/04/24923.html

On 4/18/06, XinMeng <xmeng at capitalbio.com>
wrote:
> Hello sir:
>
> group1:1,2,3,4
> group2:1,3,4,5
> group3:2,4,8,9
> .. ...
> group1000:9,3,8,2
>
> I wanna get the "intersection set" and "union set".
I've tried command "setdiff"and "union",but only two
groups is permited.How can I deal with multi groups to find the
"intersection set" and "union set"?
>
> Thanks a lot!
> My best
>
>
>
>
>
> ------------------------------
> *******************************************
> Xin Meng
> Capitalbio Corporation
> National Engineering Research Center
> for Beijing Biochip Technology
> BioPharma-informatics & Software Dept.
> Research Engineer
> Tel: +86-10-80715888/80726868-6438
> Fax: +86-10-80726790
> Email??xmeng at capitalbio.com
> Address:18 Life Science Parkway,
> Changping District, Beijing 102206, China
>
>
>
> ______________________________________________
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> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>
>

Hello sir: 

group1:1,2,3,4 
group2:1,3,4,5 
group3:2,4,8,9 
.. ... 
group1000:9,3,8,2 

I wanna get the "intersection set" and "union set". I've
tried command "setdiff"and "union",but only two groups is
permited.How can I deal with multi groups to find the "intersection
set" and "union set"?

Thanks a lot! 
My best  
 




------------------------------
*******************************************
Xin Meng 
Capitalbio Corporation
National Engineering Research Center 
for Beijing Biochip Technology 
BioPharma-informatics & Software Dept. 
Research Engineer
Tel: +86-10-80715888/80726868-6438
Fax: +86-10-80726790
Email??xmeng at capitalbio.com 
Address:18 Life Science Parkway, 
Changping District, Beijing 102206, China