[R] How to get a subscript of a vector?

arun smartpink111 at yahoo.com
Fri Jun 7 16:53:02 CEST 2013

#[1]  3  7 10

Suppose there is a vector 
A <- c(1,3,2,6,7,8,2,1,3,2). 

Now, I want to get the subscript of elements of A which equal 2. 

How can I do it ?

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