如何 Plot 一个在 X 轴上有两个分类变量的条形图（一个由另一个嵌套，但都可见），以及其他变量作为填充？

Question

I have a dataset with two categorical variables, region and function . In total there are 92 regions, divided into 13 functional categories. In addition to these regions belonging to a functional category, they are also identified as either white , gray , or other . Each region is associated with a density value that will be plotted on the y-axis. For Example:

Region	Function	Matter	Density
AMB	Cranial	Gray	4
bsc	Visual	White	0.4
LG	Visual	Gray	30.5
RET	Thalamic	Gray	25
eml	Thalamic	White	15
cpt	Motor	Other	5

I wish to create a graph similar to this, where the year dates at the top would be my functional categories, the x-axis labels would be my region names, and the bar fill would denote white/gray. However, an important distinction is I would want all of my 92 regions to be present along the x-axis once, divided into functional groups.

Example Graph

I've created graphs showing just the total averages of the regions within my functional groups as well as a graph of all regions averages separately. I would like to create something similar, but with all the functional group's associated regions present in the graph and grouped by function. Essential a merger between these two types of graphs, in addition to a fill variable for the bars.

Graph of Region Averages

Graph of Functional Group Averages

This is a pretty barebones question as I am fairly new to R and stackoverflow. I will be busy today but can provide any additional information necessary as soon as I am able to. Any help is appreciated. Thank you!

Answer 1

Six data is not much. I don't have an example to pull a good example from, but maybe you're looking for something like that:

library(ggplot2)
ggplot(data, aes(Density, fill= Matter)) + 
    geom_bar(width=.5) + 
    facet_grid(~Function + Region, scales="free_x", space="free")