如何在ggplot2中独立控制y轴刻度和x轴刻度？

Question

I want to remove axis ticks from the x-axis without removing them from the y-axis.

Right now, I can get both to be removed using:

axis.ticks=theme_blank()

For instance:

# Generate data
c <- ggplot(mtcars, aes(factor(cyl)))

c + geom_bar()+opts(axis.ticks=theme_blank())
#c + geom_bar(width=.5)
#c + geom_bar() + coord_flip()
#c + geom_bar(fill="white", colour="darkgreen")

But I don't know how to control them independently.

Answer 1

To remove just x axis ticks use axis.ticks.x=

 c <- ggplot(mtcars, aes(factor(cyl))) 
 c + geom_bar()+opts(axis.ticks.x=theme_blank())

For the latest ggplot2 version (0.9.3) instead of opts() use theme() and element_blank() .

 c <- ggplot(mtcars, aes(factor(cyl))) 
 c + geom_bar()+theme(axis.ticks.x=element_blank())