Hi Thanks for replying. I meant x[4] is the start of a peak shape and x[14] is the end of that peak and x[9] is the maxima of the peak. Thanks, John
On Mon, Mar 24, 2008 at 11:09 PM, <[EMAIL PROTECTED]> wrote: > 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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > > > [[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.
