Customizing x-axis of graph

Question

I am using scale_x_discrete() to customize ticks and labels of x-axis.

However, as figure shows, the lines cut the right-side y-axis, which doesn\'t look g

Answer 1

There is also the "expand" argument from the ggplot website. Adjust the numbers to whatever look you are trying to achieve

a + scale_x_discrete(breaks = c("2","4","8","16","32","64","128"),
                     labels=c("2","4","8","16","32","64","128"),
                     expand = c(.1,.1))

Answer 2

Why are you using a discrete scale for something at appears to be continuous.

If you replace scale_x_discrete with scale_x_continuous then this should work as you wish.

b <- a + scale_x_continuous(breaks = 2^(1:7))
b

You might be interested in a transformation to base 2, given the way your data for b appear only to be integer powers of 2.

a + scale_x_continuous(breaks = 2^(1:7), trans = 'log2')