Plotting two variables as lines using ggplot2 on the same graph

Question

A very newbish question, but say I have data like this:

test_data <-

  data.frame(

    var0 = 100 + c(0, cumsum(runif(49, -20, 20))),

    var1 = 150 + c(0, cumsum(runif(49, -10, 10))),

    date = seq(as.Date("2002-01-01"), by="1 month", length.out=100)

  )

How can I plot both time series var0 and var1 on the same graph, with the date on the x-axis, using ggplot2? Bonus points if you make var0 and var1 different colors, and can include a legend!

I'm sure this is very simple, but I can't find any examples out there.

Answer 1

If the variables that you want to plot are few in number, then you can use geom_line() function with ggplot as follows:

ggplot(test_data, aes(date)) + 

  geom_line(aes(y = var0, colour = "var0")) + 

  geom_line(aes(y = var1, colour = "var1"))+

  theme_bw()

Output: