ggplot在facet_wrap中的每个图上添加刻度线 [英] ggplot add ticks to each plot in a facet_wrap

问题描述

我想在facet_wraps的上一行的图中显示x轴刻度.例如:

I'd like to display x-axis ticks on plots in the upper rows in facet_wraps. For example:

library(ggplot2)
ggplot(diamonds, aes(carat)) +  facet_wrap(~ cut, scales = "fixed") +  geom_density()

生成此图:

我想在此情节中画上勾号:

I'd like to have ticks as I've drawn in on this plot:

有没有简单的方法可以达到这个结果?

Is there a simple way to achieve this result?

推荐答案

使用scales = "free_x"将x轴添加到每个图:

Using scales = "free_x" adds x axes to each plot:

ggplot(diamonds, aes(carat)) + 
    geom_density() + 
    facet_wrap(~cut, scales = "free_x")

但是，正如您所看到的和语法所建议的那样，它还释放了每个图的限制以进行自动调整，因此，如果要使它们保持一致，则需要使用xlim，或scale_x_continuous:

However, as you can see and the syntax suggests, it also frees the limits of each plot to adjust automatically, so if you want them all to be consistent, you'll need to set them with xlim, lims or scale_x_continuous:

ggplot(diamonds, aes(carat)) + 
    geom_density() + 
    xlim(range(diamonds$carat)) + 
    # or lims(x = range(diamonds$carat))    
    # or scale_x_continuous(limits = range(diamonds$carat))
    facet_wrap(~cut, scales = "free_x")

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