[R] To detect the location of duplicate values

[Joshua Wiley]

Hello Moohwan,

Look at ?duplicated  for example:

> x
[1] 1 1 2 2 3 3
> duplicated(x)
[1] FALSE  TRUE FALSE  TRUE FALSE  TRUE

If your end goal is to get rid of the duplicates, take a look at ?unique

> unique(x)
[1] 1 2 3

Best Regards,

Josh

On Mon, Jul 5, 2010 at 9:31 AM, Moohwan Kim <kmhlmj2 at gmail.com> wrote:
> 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
>
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/