[R] searching several subsequences in a single string sequence
b.rowlingson at lancaster.ac.uk
Tue Sep 27 23:25:43 CEST 2011
On Tue, Sep 27, 2011 at 6:15 PM, Jean V Adams <jvadams at usgs.gov> wrote:
> For example,
> songs <- c("ABCABAABABABCAB", "ABACAB", "ABABCABCBC")
> counts <- gregexpr("ABC", songs)
> sapply(counts, length)
That will still return '1' for the case where its not found, because of the -1.
will return 0.
you might get faster performance if you do 'fixed=TRUE' on the
gregexpr call as well.
> P.S. 1981 Genesis album!
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