This is working perfectly now…thanks a lot for your help.
On 27/03/2013, at 2:36 AM, "Law, Jason" <jason....@portlandoregon.gov> wrote:
> Try this:
>
> library(plyr)
> library(ggplot2)
> library(lubridate)
> data<-read.csv("http://dl.dropbox.com/u/4236038/test_cumu.csv";)
> data$Date <- as.Date(data$Date)
> cumu <- ddply(data,.(year(Date)),transform, cumRain = cumsum(Rainfall))
> ggplot(cumu, aes(x = yday(Date), y = cumRain, color = factor(year(Date)))) +
> geom_line()
>
> You'll have to work on the date axis.
>
> Jason Law
> Statistician
> City of Portland, Bureau of Environmental Services
> Water Pollution Control Laboratory
> 6543 N Burlington Avenue
> Portland, OR 97203-5452
> 503-823-1038
> jason....@portlandoregon.gov
>
>
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf Of Martin Labadz
> Sent: Monday, March 25, 2013 10:44 PM
> To: r-help@r-project.org
> Subject: [R] Plot cumulative sums of rainfall per year
>
> Hi @all,
>
> I am biting my nails with the following problem:
>
> I have a data set of daily rainfall measurements for the last 20 years. What
> I want to do is calculate the daily cumulative sum of rainfall but only for
> every year which means that the cumulative sum has to be reset each year.
> After the calculations I want to plot each year of cumulative rainfall as a
> separate line in one graph preferably using ggplot with the x-axis showing
> the julian day 1 to 365 (366) and the y-axis showing the cumulative values.
>
> I have the following code:
>
> library(plyr)
> library(ggplot2)
> data<-read.csv("http://dl.dropbox.com/u/4236038/test_cumu.csv";)
> data$year <- as.numeric(format(as.Date(data$Date), format="%Y"))
> ddply(data,.(year),transform,cumRain = cumsum(Rainfall))->cumu ggplot(cumu,
> aes(Date,cumRain))+geom_point()
>
> What it does it perfectly calculates the cumulative sum of the rainfall and
> resets the sum at the beginning of each year but I cannot plot the cumulative
> sum of rainfall in a way that each year is represented by a separate line in
> one graph such as in this example:
> http://dl.dropbox.com/u/4236038/example_cumulative_rainfall.png
>
> Any help would be highly appreciated.
>
> Thanks,
> Martin
>
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