更改线图大小，了解大小参数如何工作 [英] Change size of a line plot, understand how the size argument works

问题描述

我正在制作带有错误条的多行图。如果我不使用 size 参数，则一切正常：

 ＃sample data 
 Response = runif（4）
 ResponseMin = Response-Response / 5 
 ResponseMax = Response + Response / 5 
 Cases = rep（c（Case1， case2），each = 2）
 df = data.frame（x = 1：2，Average = Response，Lower = ResponseMin，Upper = ResponseMax，Case = Cases）
＃let's plot 
 library（ggplot2）
 ggplot（df，aes（x = x，y = Average，color = Case））+ 
 geom_line（aes（group = Case））+ 
 geom_point ）+ 
 geom_errorbar（aes（ymin = Lower，ymax = Upper，width = 0.25））+ 
 labs（y =foo，title =Some plot fu）
  

然而，当我修改线的大小，我开始变得奇怪的东西：

  ggplot（df，aes（x = x，y =平均，color = Case））+ 
 geom_line（aes（group = Case，size = 1））+ 
 geom_point（ ）+ 
 geom_errorbar（aes（ymin = Lower，ymax = Upper，width = 0.25））+ 
 labs（y =foo，title =Some plot fu）
  

为什么额外的图例条目为1？当我为errobars添加一个 size 参数时，无论 size 是：



  ggplot（df，aes（x = x，y = Average，color = Case））+ 
 geom_line（aes（ymin = Lower，ymax = Upper，width = 0.25，size = 1）geom_line（）（aes（group = Case，size = 1））+ 
 geom_point（）+ 
 geom_errorbar ）+ 
 labs（y =foo，title =一些情节）
  

  ggplot（df，aes（x = x，y = Average ，color = Case））+ 
 geom_line（aes（group = Case，size = 2））+ 
 geom_point（）+ 
 geom_errorbar（aes（ymin = Lower，ymax = Upper，width = 0.25，size = 2））+ 
 labs（y =foo，title =Some plot fu）
  





你能帮我弄清楚这里发生了什么吗？如果你在 aes 中设置 size ，你将它映射到一个变量

 `1` = 1 
  

和ggplot2创建一个图例。如果您只想设置尺寸，您可以在 aes 之外做到这一点：



  geom_line（aes（group = Case），size = 1）
  




I'm making a multiple lines plot with errorbars. If I don't use the size argument, everything is fine:

# sample data
Response=runif(4)
ResponseMin=Response-Response/5
ResponseMax=Response+Response/5 
Cases=rep(c("Case1","Case2"),each=2)    
df=data.frame(x=1:2,Average=Response,Lower=ResponseMin,Upper=ResponseMax,Case=Cases)
# let's plot
library(ggplot2)
ggplot(df,aes(x=x,y=Average,colour=Case)) +
geom_line(aes(group=Case)) + 
geom_point() +
geom_errorbar(aes(ymin=Lower,ymax=Upper,width=0.25)) +
labs(y="foo",title="Some plot fu")

However, when I modify the line size, I start getting weird stuff:

ggplot(df,aes(x=x,y=Average,colour=Case)) +
geom_line(aes(group=Case, size = 1)) + 
geom_point() +
geom_errorbar(aes(ymin=Lower,ymax=Upper,width=0.25)) +
labs(y="foo",title="Some plot fu")

Why the extra legend entry "1"? And when I add a size argument for the errobars, it looks like the size of the lines stays the same, whatever the value of size is:

ggplot(df,aes(x=x,y=Average,colour=Case)) +
geom_line(aes(group=Case, size = 1)) + 
geom_point() +
geom_errorbar(aes(ymin=Lower,ymax=Upper,width=0.25, size = 1)) +
labs(y="foo",title="Some plot fu")

ggplot(df,aes(x=x,y=Average,colour=Case)) +
geom_line(aes(group=Case, size = 2)) + 
geom_point() +
geom_errorbar(aes(ymin=Lower,ymax=Upper,width=0.25, size = 2)) +
labs(y="foo",title="Some plot fu")

Can you help me figure out what's happening here?

解决方案

If you set size inside aes you are mapping it to a variable

`1` = 1

and ggplot2 creates a legend. If you just want to set the size, you can do that outside of aes:

geom_line(aes(group=Case), size = 1)

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