使用facet_wrap显示多个直方图 [英] Show multiple histogram using facet_wrap

问题描述

样本数据

df <- data.frame(id = rep(1:6, each = 50), x = rnorm(50*6, mean = 10, sd = 5), 
                                       y = rnorm(50*6, mean = 20, sd = 10), 
                                       z = rnorm(50*6, mean = 30, sd = 15))

ggplot(df, aes(x)) + geom_histogram() + facet_wrap(~id)

对于相同ID的不同颜色，如何在同一图中显示x，y，z

How do I show x, y, z in the same plot for each id in different colours

推荐答案

最好先将数据从宽变长到长整形，然后在映射what时添加fill美观度(即x，y ，z)设置为不同的填充颜色:

It's best to reshape data from wide to long first, and then add a fill aesthetic to map what (i.e. x, y, z) to different fill colours:

library(tidyverse)
df %>%
    gather(what, val, -id) %>%
    ggplot(aes(val, fill = what)) + geom_histogram() + facet_wrap(~id)

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