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..., 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=="198...