你如何在 ggplot2 geom_bar 中订购填充颜色 [英] How do you order the fill-colours within ggplot2 geom_bar

问题描述

我正在调用 ggplot 函数

I am calling the ggplot function

ggplot(data,aes(x,y,fill=category)+geom_bar(stat="identity")

结果是条形图，条形图由与类别对应的各种颜色填充.但是，条与条之间的颜色顺序不一致.假设有粉红色、绿色和蓝色.有些条从下到上变成粉红色、绿色、蓝色，有些则变成绿色、粉红色、蓝色.我没有看到任何明显的模式.

The result is a barplot with bars filled by various colours corresponding to category. However the ordering of the colours is not consistent from bar to bar. Say there is pink, green and blue. Some bars go pink,green,blue from bottom to top and some go green,pink,blue. I don't see any obvious pattern.

这些顺序是如何选择的?我怎样才能改变它?至少，我怎样才能让 ggplot 选择一致的顺序?

How are these orderings chosen? How can I change it? At the very least, how can I make ggplot choose a consistent ordering?

(x,y 和 category) 的类分别是 (integer,numeric 和 factor).如果我将类别作为有序因素，它不会改变这种行为.

The class of (x,y and category) are (integer,numeric and factor) respectively. If I make category an ordered factor, it does not change this behavior.

有人知道如何解决这个问题吗?

Anyone know how to fix this?

可重现的例子:

dput(data)

structure(list(mon = c(9L, 10L, 11L, 10L, 8L, 7L, 7L, 11L, 9L, 
10L, 12L, 11L, 7L, 12L, 8L, 12L, 9L, 7L, 9L, 10L, 10L, 8L, 12L, 
7L, 11L, 10L, 8L, 7L, 11L, 12L, 12L, 9L, 9L, 7L, 7L, 12L, 12L, 
9L, 9L, 8L), gclass = structure(c(9L, 1L, 8L, 6L, 4L, 4L, 3L, 
6L, 2L, 4L, 1L, 1L, 5L, 7L, 1L, 6L, 8L, 6L, 4L, 7L, 8L, 7L, 9L, 
8L, 3L, 5L, 9L, 2L, 7L, 3L, 5L, 5L, 7L, 7L, 9L, 2L, 4L, 1L, 3L, 
8L), .Label = c("Down-Down", "Down-Stable", "Down-Up", "Stable-Down", 
"Stable-Stable", "Stable-Up", "Up-Down", "Up-Stable", "Up-Up"
), class = c("ordered", "factor")), NG = c(222614.67, 9998.17, 
351162.2, 37357.95, 4140.48, 1878.57, 553.86, 40012.25, 766.52, 
15733.36, 90676.2, 45000.29, 0, 375699.84, 2424.21, 93094.21, 
120547.69, 291.33, 1536.38, 167352.21, 160347.01, 26851.47, 725689.06, 
4500.55, 10644.54, 75132.98, 42676.41, 267.65, 392277.64, 33854.26, 
384754.67, 7195.93, 88974.2, 20665.79, 7185.69, 45059.64, 60576.96, 
3564.53, 1262.39, 9394.15)), .Names = c("mon", "gclass", "NG"
), row.names = c(NA, -40L), class = "data.frame") 

ggplot(data,aes(mon,NG,fill=gclass))+geom_bar(stat="identity")

推荐答案

您还需要指定 order 美学.

You need to specify the order aesthetic as well.

ggplot(data,aes(mon,NG,fill=gclass,order=gclass))+
    geom_bar(stat="identity")

这可能是也可能不是错误.

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