hi, I like to find a pattern within a giver sequence. There might be multiple occurences of the pattern. I like to know the number of occurences and the positions if possible. "grep" can tell me if a pattern exists but can't give me the information I need. Does anyone know any function that I can use or know how to do what I intend?. Thanks a lot. Sean
pattern search
2 messages · Sean Liang, Uwe Ligges
Sean Liang wrote:
hi, I like to find a pattern within a giver sequence. There might be multiple occurences of the pattern. I like to know the number of occurences and the positions if possible. "grep" can tell me if a pattern exists but can't give me the information I need. Does anyone know any function that I can use or know how to do what I intend?.
???
gr <- grep("a", c("a", "b", "a"))
grep tells you that the positions are 1 and 3. length(gr) tells you
there are two occurences.
Uwe Ligges
Thanks a lot. Sean
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