我想从这个数据框中创建一个条形图:
library(ggplot2)
mydf=data.frame(c("A","B","C","D"),c(100,110,90,120),c(150,200,160,180))
names(mydf)=c("myfirstC","mysecondC","mythirdC")
为了绘制条形图,其中条形图堆叠在一起,我试图使用此代码:
ggplot(data=mydf, aes(x=myfirstC))+
geom_col(aes(y=mysecondC), colour="blue")+
geom_col(aes(y=mythirdC), colour="red")
head(mydf)
不幸的是,此代码仅返回带有来自“mythirdC”列的条形图。
问题:如何更改代码以获得堆叠图,不用重塑数据框?