[R] How to delete repeated values in MCMC sampling and get index of unique values?

[David Winsemius]

On Jan 17, 2013, at 1:50 PM, C W wrote:

> Dear list,
> How do you delete repeated samples?  In MCMC, when your candidate value has
> been reject, so you remain on the same point, so you keep that value.
> 
> Say I have this toy example,
> 
>> c(1,6,6,6,3,5,4,4,2,3,5)

> c(1,6,6,6,3,5,4,4,2,3,5)[!duplicated(c(1,6,6,6,3,5,4,4,2,3,5))]
[1] 1 6 3 5 4 2
> x <- c(1,6,6,6,3,5,4,4,2,3,5)
> x[!duplicated(x)]
[1] 1 6 3 5 4 2
> !duplicated(x)
 [1]  TRUE  TRUE FALSE FALSE  TRUE  TRUE  TRUE FALSE  TRUE FALSE FALSE
> which(!duplicated(x))
[1] 1 2 5 6 7 9


> 

> The 6 and 4 are repeated, I only want the index of the non-repeated values.
> 
> I thought of using which() and unique(), but that does not give you the
> index of the unique values.
> 
> Thanks in advance.
> 
> Mike
> 
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> 
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David Winsemius
Alameda, CA, USA