> It is much easier to do you data preparation before plotting.
>
> Cummul <- ddply(subset(DF, precipitation!="NA"), "gauge_name",
> function(x){
> x$Cummul <- cumsum(x$precipitation)
> x
> })
With a little less typing:
Cummul <- ddply(subset(DF, precipitation!="NA"), "gauge_name", transform,
Cummul = cumsum(precipitation))
Hadley
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