[R] ggplot two-factor legend

[Rui Barradas]

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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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


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