> precip.1 <- subset(DF, precipitation!="NA") > b <- ddply(precip.1$precipitation, .(precip.1$gauge_name), cumsum) > DF.precip <- precip.1 > DF.precip$precipitation <- b$.data
I suspect what you want here is ddply(precip.1, "gauge_name", transform, precipitation = cumsum(precipitation)) Hadley -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ ______________________________________________ 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.
