[R] detect repeated number in a vector

[liujb]

Dear R users,

I have this vector that consists numeric numbers. Is there a command that
detects the repeated numbers in a vector and returns the index of the
repeated numbers (or the actual numbers)? For example, v <- c(3,4,5,7,4).
The command would return me index 2 and 5 (or the repeated number, 4).

Thank you very much,
Julia
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