缺少ggplot2和geom_line的传说 [英] Missing legend with ggplot2 and geom_line
本文介绍了缺少ggplot2和geom_line的传说的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在ggplot中绘制线条时,如何显示图例?
p < - ggplot(输出,aes(lambda),legend = TRUE)+
geom_line(aes(y = train.err),color =red,label =r)+
geom_line(aes(y = test.err),color = blue,label =b)+
geom_line(aes(y = data.err),color =green,label =g)
print(p)
其中输出是具有以下结构的数据框:
'data.frame':2101 obs。 4个变量:
$ lambda:num 3.06e-07 3.09e-07 3.12e-07 3.15e-07 3.18e-07 ...
$ train.err:num 0.415 0.415 0.415 0.415 0.415 ...
$ test.err:num 0.373 0.373 0.373 0.373 0.373 ...
$ data.err:num 0.398 0.398 0.398 0.398 0.398 ...
$ $
$ b解决方案(x = 1:5,y1 = 1:5,y2 = 2:6)
ggplot(d,aes(x ))+
geom_line(aes(y = y1,color =1))+
geom_line(aes(y = y2,color =2))+
scale_colour_manual = c(red,blue))
但我推荐这样:
d2 < - melt(d,id =x)
ggplot(d2,aes(x,value,color =变量))+
geom_line()+
scale_colour_manual(values = c(red,blue))
How does one get a legend to display when plotting lines in ggplot? I've been trying all evening but have been unsuccessful.
p <- ggplot(output, aes(lambda), legend=TRUE) +
geom_line(aes(y=train.err), colour="red", label="r") +
geom_line(aes(y=test.err), colour="blue", label="b") +
geom_line(aes(y=data.err), colour="green", label="g")
print(p)
Where output is a dataframe with the following structure:
'data.frame': 2101 obs. of 4 variables:
$ lambda : num 3.06e-07 3.09e-07 3.12e-07 3.15e-07 3.18e-07 ...
$ train.err: num 0.415 0.415 0.415 0.415 0.415 ...
$ test.err : num 0.373 0.373 0.373 0.373 0.373 ...
$ data.err : num 0.398 0.398 0.398 0.398 0.398 ...
解决方案
put colour inside the aes like this:
d<-data.frame(x=1:5, y1=1:5, y2=2:6)
ggplot(d, aes(x)) +
geom_line(aes(y=y1, colour="1")) +
geom_line(aes(y=y2, colour="2")) +
scale_colour_manual(values=c("red", "blue"))
but I recommend this way:
d2 <- melt(d, id="x")
ggplot(d2, aes(x, value, colour=variable)) +
geom_line() +
scale_colour_manual(values=c("red", "blue"))
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