ggplot2中的相同图例中的不同传奇按键 [英] Different legend-keys inside same legend in ggplot2
问题描述
df < - data.frame(id = 1:10,line = rnorm (10),points = rnorm(10))
library(ggplot2)
ggplot(df)+
geom_line(aes(id,line,color = line))+
geom_point(aes(id,points,color =points))
基本上,我希望相对于 points
的图例键只是一个点,没有中间的线。我接近这一点:
library(reshape2)
df < - melt( df,id.vars =id)
ggplot()+
geom_point(aes(id,value,shape = variable),df [df $ variable ==points, ])+
geom_line(aes(id,value,color = variable),df [df $ variable ==line,])
,但它定义了两个独立的图例。修复第二个代码(并重新设计我的数据)也可以,但我更喜欢用一种方法(如果有的话)手动更改任何图例键(并继续使用第一个代码)。谢谢!
编辑:
感谢@alexwhan您刷新了我关于变量映射的记忆。然而,到目前为止,最简单的方法仍然是以下(非常糟糕的黑客!):
df < - data.frame(id = 1:10,line = rnorm(10),points = rnorm(10))
ggplot(df)+
geom_line(aes(id,line,color =line))+
geom_point(aes(id,points,shape =points))+
theme(legend.title = element_blank())
这只是隐藏了两个不同图例的标题。
其他想法超过欢迎!!!
您可以使用 override.aes =
在 guides()
函数内改变图例的默认外观。在这种情况下,您的指南是 color =
,然后您应该设置 shape = c(NA,16)
用于行,然后 linetype = c(1,0)
从点删除行。
ggplot(df)+
geom_line(aes(id,line,color =line))+
geom_point(aes(id,points,color =points))+
guides(color = guide_legend(override.aes = list(shape = c(NA,16),linetype = c(1,0))))
Let's say I don't need a 'proper' variable mapping but still would like to have legend keys to help the chart understanding. My actual data are similar to the following df
df <- data.frame(id = 1:10, line = rnorm(10), points = rnorm(10))
library(ggplot2)
ggplot(df) +
geom_line(aes(id, line, colour = "line")) +
geom_point(aes(id, points, colour = "points"))
Basically, I would like the legend key relative to points
to be.. just a point, without the line in the middle. I got close to that with this:
library(reshape2)
df <- melt(df, id.vars="id")
ggplot() +
geom_point(aes(id, value, shape = variable), df[df$variable=="points",]) +
geom_line(aes(id, value, colour = variable), df[df$variable=="line",])
but it defines two separate legends. Fixing the second code (and having to reshape my data) would be fine too, but I'd prefer a way (if any) to manually change any legend key (and keep using the first approch). Thanks!
EDIT :
thanks @alexwhan you refreshed my memory about variable mapping. However, the easiest way I've got so far is still the following (very bad hack!):
df <- data.frame(id = 1:10, line = rnorm(10), points = rnorm(10))
ggplot(df) +
geom_line(aes(id, line, colour = "line")) +
geom_point(aes(id, points, shape = "points")) +
theme(legend.title=element_blank())
which is just hiding the title of the two different legends.
Other ideas more than welcome!!!
You can use override.aes=
inside guides()
function to change default appearance of legend. In this case your guide is color=
and then you should set shape=c(NA,16)
to remove shape for line and then linetype=c(1,0)
to remove line from point.
ggplot(df) +
geom_line(aes(id, line, colour = "line")) +
geom_point(aes(id, points, colour = "points"))+
guides(color=guide_legend(override.aes=list(shape=c(NA,16),linetype=c(1,0))))
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