[R] ggplot two-factor legend

[sibyiie@stoeckii m@iii@g oii gmx@ch]

Thanks a lot Rui and Jeff

Yes including labels=c() in  scale_linetype_manual() was the hint.

Sibylle

-----Original Message-----
From: Rui Barradas <ruipbarradas using sapo.pt> 
Sent: Thursday, July 18, 2024 6:50 PM
To: sibylle.stoeckli using gmx.ch; r-help using r-project.org
Subject: Re: [R] ggplot two-factor legend

Às 17:43 de 18/07/2024, Rui Barradas escreveu:
> Às 16:27 de 18/07/2024, SIBYLLE STÖCKLI via R-help escreveu:
>> Hi
>>
>> I am using ggplot to visualise y for a two-factorial group (Bio: 0 
>> and
>> 1) x
>> = 6 years. I was able to adapt the colour of the lines (green and 
>> red) and the linetype (solid and dashed).
>> Challenge: my code produces now two legends. One with the colors for 
>> the group and one with the linetype for the group. Does somebody have 
>> a hint how to adapt the code to produce one legend? Group 0 = red and 
>> dashed, Group 1 = green and solid?
>>
>>
>> MS1<- MS %>% filter(QI_A!="NA") %>% droplevels() dev.new(width=4, 
>> height=2.75) par(mar = c(0,6,0,0)) p1<-ggplot(data = MS1, aes(x= 
>> Jahr, y= QI_A,group=Bio,color=Bio,
>> linetype=Bio)) +
>>          geom_smooth(aes(fill=Bio) , method = "lm" , formula = y ~ x 
>> +
>> I(x^2),linewidth=1) +
>>     theme(panel.background = element_blank())+
>>     theme(axis.line = element_line(colour = "black"))+
>>    theme(axis.text=element_text(size=18))+
>>    theme(axis.title=element_text(size=20))+
>>     ylab("Anteil BFF an LN [%]") +xlab("Jahr")+
>>     scale_color_manual(values=c("red","dark green"), labels=c("ÖLN", 
>> "BIO"))+
>>     scale_fill_manual(values=c("red","dark green"), labels= c("ÖLN", 
>> "BIO"))+
>>     theme(legend.title = element_blank())+
>>    theme(legend.text=element_text(size=20))+
>>    scale_linetype_manual(values=c("dashed", "solid"))
>> p1<-p1 + expand_limits(y=c(0, 30))
>>
>> kind regards
>> Sibylle
>>
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>> and provide commented, minimal, self-contained, reproducible code.
> Hello,
> 
> To have one legend only, the labels must be the same. Try using
> 
> labels=c("ÖLN", "BIO")
> 
> in
> 
> scale_linetype_manual(values=c("dashed", "solid"), labels=c("ÖLN", 
> "BIO"))
> 
> 
> Hope this helps,
> 
> Rui Barradas
> 
> 
Hello,

Here is a more complete an answer with the built-in data set mtcars.
Note that the group aesthetic is not used. This is because linetype is categorical (after mutate) and there's no need to group again by the same variable (am).

Remove labels from scale_linetype_manual and there are two legends but with the same labels the legends merge.


library(ggplot2)
library(dplyr)

mtcars %>%
   # linetype must be categorical
   mutate(am = factor(am)) %>%
   ggplot(aes(hp, disp, color = am, linetype = am)) +
   geom_line() +
   scale_color_manual(
     values = c("red","dark green"),
     labels = c("ÖLN", "BIO")
   ) +
   scale_linetype_manual(
     values = c("dashed", "solid"),
     labels = c("ÖLN", "BIO")
   ) +
   theme_bw()


Hope this helps,

Rui Barradas



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