ggplot: line plot for discrete x-axis

Question

I have the following table but after many tries have been unable to plot the data so that the x-axis tick marks line up with the year. I have found solutions to

Answer 1

Reproducible example:

data <- data.frame(dist=c(2.914, 2.437, 2.542), year=c(2013, 2014, 2015))
# this ensures that stuff will be ordered appropriately
data$year <- ordered(data$year, levels=c(2013, 2014, 2015))
ggplot(data, aes(x=factor(year), y=dist, group=1)) +
  geom_line() +
  geom_point()

Specifying the year as an ordered factor will ensure that the x axis is ordered appropriately, regardless of the order in which the levels appear (whereas just using "factor(year)" in the plotting aesthetic could lead to issues).