Subset data and plotting in R - r

Question

I would like to use R to simplify and subset large datasets (over 100 000 values) and then plot them. Below is a simplified version of my dataset (Figure 1) where I broke it down into three years and two crop types. I have a Year (2011-2013), two crop types (Corn and Soybean) and their total Area.
I want to subset the data into the total Area of Corn and Soybean by year into a new table(example figure 2) with the year, type and total area and then plot the total area by year for each (example of plot in Figure 3).
Figure 1 Small example dataset
Figure 2 New total table
Figure 3 example of graph that I want to produce
I thought I could subset the data by year and crop with
corn2011 <- subset(CropTable, Year==2011 & Lulc=="Corn")
corn2012 <- subset(CropTable, Year==2012 & Lulc=="Corn")
and then I can summarize the data using the sum function
sum(corn2011[,3]),
but I'm not sure how to plot them yearly or against each other to have it look like Figure 3.

Answer 1

for your plot, you could try this
data.df <- read.table(text="
Year Type Area
1 2011 corn 30
2 2012 corn 15
3 2013 corn 50
4 2011 Soy 45
5 2012 Soy 30
6 2013 Soy 60",
header = TRUE)
ggplot(data=data.df, aes(x=as.factor(Year), y=Area, group=Type, color=Type)) + geom_line() + xlab("Year") + ylab("Area (ha)") + theme_bw() + scale_color_manual(values=c("red", "blue"))