How to make ggplot2 plots prettier?

Question

I have generated the following plot using the R code that follows it:

ggplot(lengths, aes(leng         


        

Answer 1

1: + scale_x_continuous(breaks=rep(5000,12)).

You could also put the xlim declaration in here, using limits, eg,

+ scale_x_continuous(breaks=rep(5000,12),limits=c(0,60000))

2: For the labels you could use annotate() or geom_text(). See this post for examples. You would have to calculate the values yourself for this though.