I don't quite understand your English, but I'll take a stab at answering your question. If by "date" you mean "data" and by "peaks" "maxima," then
df <- data.frame(V1=c(23, 4, 56, 7, 99, 33)) interval <- 2 if (nrow(df) %% interval == 0) tapply(df$V1, rep(1:(nrow(df) / interval), each=interval), max) might be what you need. Mark Wilkinson Informatics Analyst St. Jude Children's Research Hospital Department of Pharmaceutical Sciences The opinions expressed here are my own and do not necessarily represent those of St. Jude Children's Research Hospital. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 26, 2003 4:09 PM To: [EMAIL PROTECTED] Subject: [R] multiple peaks in data frame Hello, it wanted to know how I can extract of a dates frame the values peaks according to an interval that I establish. For example if dates are: 1 23 2 4 3 56 4 7 5 99 6 33 extract the date i wanted to divide into intervals of 2 an d to take alone the numbers 23, 56 and 99 of those 3 intervals. Thanks Ruben ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
