[R] about "intersection set" and "union set"

[XinMeng]

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  
 




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*******************************************
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£ºxmeng at capitalbio.com 
Address:18 Life Science Parkway, 
Changping District, Beijing 102206, China