Try this: which(x %in% max(x))
Then yuo can use, max or tail for get the last value. On Thu, Jul 2, 2009 at 4:30 PM, Kenny D'Amica <kenny.dam...@aier.org> wrote: > Hello, > > > > I'm currently writing a program to analyze economic indicators, and need > to identify the indices of peaks and troughs in certain intervals > (business cycles) of my time series. I am using which.max() for this, > which gives me the index of the first max in the interval. However, I > need a function that returns the last max. > > > > One workaround I've thought of is to switch the endpoints of my range > around, i.e. > > > > Instead of: > > > > > x <- c(1:4,8,1:3,8,1,2) > > > x > > [1] 1 2 3 4 8 1 2 3 8 1 2 > > > which.max(x[1:11]) > > [1] 5 > > > > Using: > > > > > which.max(x[11:1]) > > [1] 3 > > > y <- (length(x[11:1])- which.max(x[11:1]) + 1) > > > y > > [1] 9 > > > > which would return the last max. > > > > However, I'd rather not add this layer of obfuscation to my code if it > can be avoided. > > > > Any suggestions? Thanks in advance for your help. > > > > -Kenny D'Amica > > > [[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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[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.
