r - 做分组条形图的最简单方法

Question

我有以下数据框:

 Catergory        Reason Species
1   Decline       Genuine      24
2  Improved       Genuine      16
3  Improved Misclassified      85
4   Decline Misclassified      41
5   Decline     Taxonomic       2
6  Improved     Taxonomic       7
7   Decline       Unclear      41
8  Improved       Unclear     117

我正在尝试制作一个分组条形图，将物种作为高度，然后将 2 种颜色作为分类。

这是我的代码:

Reasonstats<-read.csv("bothstats.csv")
Reasonstats2<-as.matrix(Reasonstats[,3])


barplot((Reasonstats2),beside=T,col=c("darkblue","red"),ylab="number of 
species",names.arg=Reasonstats$Reason, cex.names=0.8,las=2,space=c(0,100)
,ylim=c(0,120))
box(bty="l")

现在我想要的是不必将两个条标记两次并将它们分开，我已经尝试将空间值更改为各种东西，但它似乎并没有将条分开。谁能告诉我我做错了什么？

Answer 1

使用 ggplot2:

library(ggplot2)
Animals <- read.table(
  header=TRUE, text='Category        Reason Species
1   Decline       Genuine      24
2  Improved       Genuine      16
3  Improved Misclassified      85
4   Decline Misclassified      41
5   Decline     Taxonomic       2
6  Improved     Taxonomic       7
7   Decline       Unclear      41
8  Improved       Unclear     117')

ggplot(Animals, aes(factor(Reason), Species, fill = Category)) + 
  geom_bar(stat="identity", position = "dodge") + 
  scale_fill_brewer(palette = "Set1")