按组对构面进行排序 [英] Sort facet by groups

问题描述

我有一个看起来像这样的数据框

I have a data frame that looks like this

df <- data.frame(id=rep(c(1,5,2,6,4,3), each=5),
                 group=rep(c(1,2,2,2,1,1), each=5),
                 var1=runif(30))

我现在想使用 ggplot 绘制 var1 并通过 id 对该图进行分面，但是要按 group对该分面进行排序(以及 group 中的 id ).我认为必须使 id 成为一个按 group 整齐地排列的级别的因子，但是我不知道如何优雅地完成此操作.

I now want to plot var1 using ggplot and facet the plot by id, but sort the facets by group (and by id within group). I gather that I have to make id a factor with levels that sort neatly by group but I cannot figure out how to accomplish this elegantly.

推荐答案

# sort by group and id
df_sorted <- df[with(df, order(group, id)), ]
# reorder factor levels
df_sorted$id <- factor(df_sorted$id, levels=unique(df_sorted$id))
# plot something
ggplot(df_sorted, aes(var1)) + facet_wrap(~id) + geom_density()

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