使用ggplot2为不同的行添加图例 [英] regrading adding a legend using ggplot2 for different lines

问题描述

我想添加一个图例，该图例将使用 ggplot2 分辨出哪种颜色代表哪条线.我的代码如下:

I want to add a legend that will tell which color represents which line using ggplot2. My code is as follows :

require(lme4)
require(ggplot2)
m1 <- lmer(Reaction ~ 1+I(Days) + (1+ Days| Subject) , data = sleepstudy)

pred1new1=predict(m1,re.form=NA)

要添加图例，我尝试了 scale_colour_manual ，但没有成功.

To add a legend, i tried scale_colour_manual , but it didnt worked.

p21 <- ggplot(data = sleepstudy, aes(x = Days, y = Reaction))
p21+ geom_point() + geom_smooth(col="blue")+ geom_line(aes(y=pred1new1,group = Subject) ,col="red", lwd = 0.5)+
  scale_colour_manual(name = 'the colour', 
                      values =c('blue'='blue','red'='red'), labels = c('smooth','pred'))

任何人都可以提出任何解决方案的建议吗?

Can anyone suggest anything to fix this ?

谢谢

推荐答案

将color参数放入 aes 中，并为其指定要在图例中显示的名称，然后选择标题和颜色在 scale_color_manual

Put the color parameter in aes and give it the name you want to show in the the legend and then choose the title and colors in scale_color_manual

示例:

library(ggplot2)

ggplot(mpg, aes(displ, hwy)) +
  geom_point() +
  geom_smooth(aes(color='Smooth 1')) +
  geom_smooth(aes(y = (hwy -1), color='Smooth 2')) +
  scale_color_manual('Legend Title', values=c('Smooth 1'='blue', 'Smooth 2'='red'))

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