ggplot facet_wrap在每个方面的特定变量顺序 [英] ggplot facet_wrap with specific order of variables in each facet
问题描述
我想用ggplot绘制这些数据:
I would like to plot these data with ggplot:
library(ggplot2)
set.seed(0)
df <- data.frame(
var1 = rep(c("group1", "group2"), each = 3),
var2 = rep(letters[1:3], 2),
value = runif(6, 0, 10)
)
The plot should be faceted like this:
pl <- ggplot(df, aes(var2, value))
pl <- pl + geom_col()
pl <- pl + facet_wrap(~ var1, scales = "free")
pl
x轴上的 var2
的顺序应该由值
。我可以做到这一点:
The order of var2
on the x-axis should be determined by increasing order of value
. I could achieve this doing:
df$temp_var <- paste(df$var1, df$var2)
pl <- ggplot(df, aes(reorder(temp_var, value), value))
pl <- pl + geom_col()
pl <- pl + facet_wrap(~ var1, scales = "free")
pl
但是,x轴标签应该是 a
, b
和 c
。通常,我会将 var2
转换为具有我想要的顺序的因子级别的因子,但在这种情况下,这可能是不可能的。
任何人有任何想法如何做到这一点? :)
However, x-axis labels should be a
, b
and c
. Normally, I would convert var2
to a factor with the factor levels having the order I want, but in that case this is probably not possible.
Anybody having any ideas how this can be done? :)
推荐答案
只需将轴标签设置为与具有命名字符向量的实际分隔符不同即可:
Just set the axis labels to be different than the actual breaks with a named character vector:
pl + scale_x_discrete(labels = setNames(as.character(df$var2), df$temp_var))
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