[R] ask a question about data sets element

From: song song <rprojecthelp_at_gmail.com>
Date: Thu, 17 Jun 2010 16:40:53 -0700

for example, I have


now if I have i=5, so i in a1, then I get a feedback tag[5]=1
                   i=8,  so i in a3, then can get tag[8]=3

in there any function to do this to check the element belongs to which group?

thank you!!!

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