Change grid line behavior in ggplot2

Question

Say I have the following data:

require(ggplot2)
set.seed(123)
data <- data.frame(x = sample(1:20, 100, replace = TRUE))

I want to create a dot plot of data$x, so this is what I do:

ggplot(data, aes(x)) +
  geom_dotplot(binwidth = 1) +
  scale_x_continuous(breaks = seq(1, 20, 1)) +
  scale_y_continuous(breaks = NULL)

Which gives me this:

I would like to get rid of those vertical grid lines, so I add theme(line = element_blank()) to my ggplot statement. The problem is that command also eliminates the tick marks, which I would like to keep. How can I hide the grid lines whilst keeping their respective ticks?

I would also like to know how I can change the grid lines so they'll be drawn every 1:20, not at every 0.5 mark.

I've looked for those answers in ?title() and ?geom_dotplot, tried a couple of things, to no avail. Appreciate the help!

Answer 1

Use panel.grid

theme(panel.grid = element_blank())

If you want the grid lines to be drawn every 1:20, not at every 0.5 mark.

 theme(panel.grid.minor =   element_blank(),
        panel.grid.major =   element_line(colour = "white",size=0.75))

Answer 2

you might find answers here

opts has been changed to theme. but the thing about grid.major.x, grid.minor.y should set on the track

To get rid of the major grid line, for example

ggplot(data, aes(x)) +
    geom_dotplot(binwidth = 1) +
    scale_x_continuous(breaks = seq(1, 20, 1)) +
    scale_y_continuous(breaks = NULL) + theme(panel.grid.major = element_blank())