[R] Getting indeices of intersecting elements.

[David Winsemius]

On Oct 14, 2009, at 12:15 PM, Praveen Surendran wrote:

> Hi,
>
>
>
> Is there a command to get the indices of intersecting elements of two
> vectors as intersect() will give the elements and not its indices.

?which
>

samp1 <- sample(seq(3,198, by=3), 20); samp2 <- sample(seq(3,198,  
by=3), 20)
  int <- intersect(samp1, samp2)
  int
#[1]  48  87   9 159  36   6  39 105
  which(seq(3,198, by=3) %in% int)
#[1]  2  3 12 13 16 29 35 53

>
>
>
> Thanks in advance.
>
>
>
> Praveen Surendran
>
> School of Medicine and Medical Sciences
>
> University College Dublin
>
> Belfield, Dublin 4
>
> Ireland.
>
>
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>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT