如何更改ggplot中的facet标签的顺序(自定义facet wrap标签) [英] How to change the order of facet labels in ggplot (custom facet wrap labels)

问题描述

我使用 ggplot 绘制了一个分面图，这里是图

I plotted a facet plot using ggplot and here is the plot

我遇到的问题是，刻面(标签)按字母顺序排序(例如:E1、E10、E11、E13、E2、E3、I1、I10、I2)但我需要它们是像 E1 这样的自定义订单，I1、E2、I2、E3、E10、I10、E11、E13.

The problem I have is, The facets(labels) are sorted alphabetically (Ex: E1, E10, E11,E13, E2, E3, I1, I10, I2) but I need them to be a custom order like E1, I1, E2, I2, E3, E10, I10, E11, E13.

我该怎么做?

推荐答案

不要依赖 factor() 或 ggplot 内部施加的默认级别顺序如果您提供的分组变量不是一个因素.自己明确设置级别.

Don't rely on the default ordering of levels imposed by factor() or internally by ggplot if the grouping variable you supply is not a factor. Set the levels explicitly yourself.

dat <- data.frame(x = runif(100), y = runif(100), 
                  Group = gl(5, 20, labels = LETTERS[1:5]))
head(dat)
with(dat, levels(Group))

如果我想要它们按这种任意顺序怎么办?

What if I want them in this arbitrary order?

set.seed(1)
with(dat, sample(levels(Group)))

为此，请按照您希望的方式设置级别.

To do this, set the levels the way you want them.

set.seed(1) # reset the seed so I get the random order form above
dat <- within(dat, Group <- factor(Group, levels = sample(levels(Group))))
with(dat, levels(Group))

现在我们可以使用它来按照我们想要的顺序绘制面板:

Now we can use this to have the panels drawn in the order we want:

require(ggplot2)
p <- ggplot(dat, aes(x = x)) + geom_bar()
p + facet_wrap( ~ Group)

产生:

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