[R] Count matches of a sequence in a vector?

[Phil Spector]

If I understand what you're looking for, I think this
may work:

> seq=c(2,3,4)
> v=c(4,2,5,8,9,2,3,5,6,1,7,2,3,4,5)
> lseq = length(seq)
> lv = length(v)
> matches = sapply(1:(lv-lseq+1),function(i)all(v[i:(i+lseq-1)] == seq))
> sum(matches)
[1] 1

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu



On Wed, 21 Apr 2010, Jeff Brown wrote:

>
> One option might be to turn the sequence into a character string, and then
> use something like grep().  Kind of a kludge, but possibly easy.
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