It's hard to see how positions 4 and 14 correspond to 'peaks', they look like troughs to me. So perhaps this is what you mean:
> x <- c(14,15,12,11,12,13,14,15,16,15,14,13,12,11,14,12) > y <- which(x == min(x)) > y [1] 4 14 as a function: somefunction <- function(x) which(x == min(x)) Bill Venables CSIRO Laboratories PO Box 120, Cleveland, 4163 AUSTRALIA Office Phone (email preferred): +61 7 3826 7251 Fax (if absolutely necessary): +61 7 3826 7304 Mobile: +61 4 8819 4402 Home Phone: +61 7 3286 7700 mailto:[EMAIL PROTECTED] http://www.cmis.csiro.au/bill.venables/ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Research Scholar Sent: Tuesday, 25 March 2008 12:54 PM To: r-help@r-project.org Subject: [R] peak finding Hi all Is there a function that can find the start and end position of peaks in a set of numbers. eg. x <- c(14,15,12,11,12,13,14,15,16,15,14,13,12,11,14,12) y <- somefunction(x) y 4 14 Thanks John [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
