Hi, If I understood your question, maybe sth like this:
AnnualFireCount<-aggregate(ANY.OF.YOUR.VARIABLES~Fire_Year, length, data=yukon) you can put any variable name in your dataframe (eg Fire_Year) in the place of ANY.OF.YOUR.VARIABLES as the function only counts them. On Tue, Jun 14, 2011 at 2:19 AM, saba <sa...@gmx.net> wrote: > Hello, > > I used R a year ago. With the data I am working with now, I realized that I > need to go back to R. Unfortunately, my memory is not my friend if it comes > down to coding :-) > > What I want to do is extract the length of a variable of a file with > certain > conditions and then print this number in a new variable.. > > My file (yukon), contains information about fires in the Yukon Territory, > and it looks basically like this: > > Fire_Year Area_Hecta InitialFir ... and other headers but they are not > important > > The Fire_Year ranges from 1980-2010, the Area_Hecta contains numbers and > the > InitialFir contains a date written like this: 24/05/1980 > > My end goal is to plot 2 plots, one with the summed area burned per year > and > the other plot should show the number of fires happening per year. > > I managed the first plot with the command aggregate. > > annualAB.sum<-aggregate(yukon$Area_Hecta~yukon$Fire_Year, sum, data=yukon) > > Now I am having troubles with the second plot. I created subsets for each > year and then used the length command..then I could take all those numbers > and put them in a new variable... > > y1980 <- subset(yukon,Fire_Year=="1980") > length(y1980$Area_Hecta) > > but I somehow feel that there must be a better solution...maybe a loop? > > Any help is greatly appreciated > Thanks so much > Sandra > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Count-objects-and-print-it-into-a-new-variable-tp3595174p3595174.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > -- Majid Einian PhD Candidate in "Economics" Graduate School of Management and Economics Sharif University of Technology [[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.
