[R] To detect the location of duplicate values

[Moohwan Kim]

Dear R family,

I have a question about how to detect some duplicate numeric observations.
Suppose that I have two variables dataset.

order value
1  0.52
2  0.23
3  0.43
4  0.21
5  0.32
6  0.32
7  0.32
8  0.32
9  0.32
10 0.12
11 0.46
12 0.09
13 0.32
14 0.25
;
Could you help me indicate where the duplicate observations in a row
(e.g., 0.32) are?

best,
moohwan