[R] Search for locations of subsequences?

[Marc Schwartz]

On Aug 28, 2012, at 4:05 PM, Duncan Murdoch <murdoch.duncan at gmail.com> wrote:

> Is there a function to efficiently search for a subsequence within a vector?
> 
> For example, with
> 
> x <- 1:100
> 
> I'd like to search for the sequence c(49,50,51), and be told that it occurs exactly once, starting at location 49.  (The items in the vectors might be numeric or character, and there might be repetitions within the search pattern or within the vector I'm searching.)
> 
> Duncan Murdoch


There is a thread here:

  http://tolstoy.newcastle.edu.au/R/e17/help/12/02/4201.html

that has various solutions and towards the end has a post with some timings.

Regards,

Marc Schwartz