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Hello, I've been trying to use ggplot, but I cannot seem to get my data in the correct form. I usually have a vector x, and a matrix y and I would usually use matplot(x,y) to plot the columns of y against x. Now, if i understand correctly, I should cast x and y into a data.frame and do something like ggplot(x,y,data=data). I think I'm missing something here: do I really need to