Hi, all. Andy Liaw (and one other person, whose name I already lost) pointed out to me that this was answered on the list a few weeks ago. Petr Pikal posted code based on an idea from Brian Ripley: peaks <- function(series, span=3){ z <- embed(series, span) result <- max.col(z) == 1 + span %/% 2 result } Somehow I missed this when searching before I posted. Matt Wiener -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._