[R] Function that is giving me a headache- any help appreciated (automatic read )

[Hadley Wickham]

> 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/