ggplot2：缺少图例以及如何添加？

Question

我想根据数据框绘制条形图和折线图。下面的代码，

library("ggplot2")

numb <- c(1,2,3,4,5,6,7,8,9)
mydist <- c(53.846154,15.384615,15.384615,7.692308,7.692308,0,0,0,0)
basedist <- c(30.103,17.609126,12.493874,9.691001,7.918125,6.694679,5.799195,5.115252,4.575749)
df <- data.frame(numb, mydist, basedist)

ggplot(data=df,aes(x=numb)) + 
  geom_bar(stat="identity", aes(y=mydist), colour="green", fill="green") +
  geom_line(aes(y=basedist,group=1, colour="base distribution")) +  
  geom_point(aes(y=basedist), colour="red") +
  ggtitle("My Chart") +
  labs(x="numb", y="percentage") +
  scale_x_discrete(limits=c("1","2","3","4","5","6","7","8","9")) +
  scale_y_continuous(breaks=seq(0,100,10)) +
  theme(axis.title.x = element_text(size=10, colour ="#666666")) +
  theme(axis.title.y = element_text(size=10, color="#666666")) +
  theme(plot.title = element_text(size=16, face="bold", hjust=0, color="#666666")) +
  theme(axis.text = element_text(size=12)) +
  theme(legend.title = element_text(colour="white", size = 16, face='bold'))

结果不是我想要的，因为没有条形图例

我用下面 Excel 中的相同数据集复制了我需要的图表，

我需要更改我的代码什么才能获得我需要的图表？

谢谢，大堂

Answer 1

这是一个简单的例子。一般来说，我会建议您重新格式化 ggplot() 赋值以使调试更容易。即 gp <- gp +

gp <- ggplot(data=df, aes(x=numb))
gp <- gp + geom_bar( aes(y = mydist, fill = "green"), stat="identity", color="green")
gp <- gp + geom_line( aes( y = basedist, group = 1, colour = "base distribution"))
gp <- gp + scale_fill_manual(values = "green", labels = "my distribution")
gp <- gp + geom_point(aes(y=basedist), colour="red") 
gp <- gp + ggtitle("My Chart") 
gp <- gp + labs(x="numb", y="percentage") 
gp <- gp + scale_x_discrete(limits=c("1","2","3","4","5","6","7","8","9")) 
gp <- gp + scale_y_continuous(breaks=seq(0,100,10)) 
gp <- gp + theme(axis.title.x = element_text(size=10, colour ="#666666"))
gp <- gp + theme(axis.title.y = element_text(size=10, color="#666666"))
gp <- gp + theme(plot.title = element_text(size=16, face="bold", hjust=0, color="#666666"))
gp <- gp + theme(axis.text = element_text(size=12)) 
gp <- gp + theme(legend.title = element_text(colour="white", size = 16, face='bold'))
gp <- gp + theme(legend.key = element_blank(), legend.title=element_blank(), legend.box  ="vertical")
gp

Answer 2

无需改动太多原始代码，只需将 fill 放入 aes 映射，然后添加 scale 设置颜色 values 和labels:

ggplot(data=df,aes(x=numb)) + 
  geom_bar(stat="identity", aes(y=mydist, fill="green"), colour="green") +
  geom_line(aes(y=basedist,group=1, colour="base distribution")) +  
  geom_point(aes(y=basedist), colour="red") +
  ggtitle("My Chart") +
  labs(x="numb", y="percentage") +
  scale_x_discrete(limits=c("1","2","3","4","5","6","7","8","9")) +
  scale_y_continuous(breaks=seq(0,100,10)) +
  scale_fill_manual(values = "green", labels = "my distribution") +
  theme(axis.title.x = element_text(size=10, colour ="#666666")) +
  theme(axis.title.y = element_text(size=10, color="#666666")) +
  theme(plot.title = element_text(size=16, face="bold", hjust=0, color="#666666")) +
  theme(axis.text = element_text(size=12)) +
  theme(legend.title = element_text(colour="white", size = 16, face='bold'))

ggplot2：缺少图例以及如何添加？

ggplot2: missing legend and how to add?

r

legend

ggplot2