hi everyone! hope you can help me here.
i am a new R user. what i am trying to do is to find the maximum annual discharge from a daily record. i have a data.frame which includes date and the discharge. somewhat like this.. 10/1/1989 2410 10/2/1989 2460 10/3/1989 2890 ... ... ... 12/31/2005 5730 i have been browsing through the archives and fount out about the aggregate function and the zoo package. here's one of the codes i've tried DF <- read.table(data[i], sep =",") ##i have several stations to assimilate Date <- as.Date(as.character(DF[,3]), "%m/%d/%Y") #the date is at the 3rd column, obviously library(zoo) z <- aggregate(zoo(DF[,4]), cut(Date, "y"), max) max.discharge <- coredata(z) date <- time(z) the result should somehow look like this 11/21/1926 32600 4/24/1927 66500 ... ... .. 4/26/2005 111000 thanks for your time reading my questions,, any suggestions will be truly appreciated... -- View this message in context: http://www.nabble.com/annual-maximum-value-tp22049205p22049205.html Sent from the R help mailing list archive at Nabble.com. [[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.
