Remove 'a' from legend when using aesthetics and geom_text

问题

How can I can remove the letter \'a\' from the legend generated by this code? If I remove the geom_text, then the \'a\' letter will not show in the legend. I want to keep geom_text, though.

ggplot(data = iris, aes(x = Sepal.Length, y=Sepal.Width, shape = Species, colour = Species)) + 
   geom_point() + 
   geom_text(aes(label = Species))

回答1:

Set show.legend = FALSE in geom_text:

ggplot(data = iris,
       aes(x = Sepal.Length, y = Sepal.Width, colour = Species, shape = Species, label = Species)) + 
    geom_point() +
    geom_text(show.legend = FALSE)

The argument show_guide changed name to show.legend in ggplot2 2.0.0 (see release news).

---

Pre-ggplot2 2.0.0:

With show_guide = FALSE like so...

ggplot( data=iris, aes(x=Sepal.Length, y=Sepal.Width , colour = Species , shape = Species, label = Species ) , size=20 ) + 
geom_point()+
geom_text( show_guide  = F )

回答2:

I had a similar problem. Simon's solution worked for me but a slight twist was required. I did not realise that I need to add "show_guide = F" to geom_text's arguments, rather than replace with it the existing arguments - which is what Simon's solution shows. For a ggplot2 noob like me this was not that obvious. A proper example would have used the OP's code and just added the missing argument like this:

..
geom_text(aes(label=Species), show_guide = F) +
..

回答3:

Like Nick said

the following code would still produce the error:

geom_text(aes(x=1,y=2,label="",show_guide=F))

whereas:

geom_text(aes(x=1,y=2,label=""),show_guide=F)

outside the aes argument eliminates the a over the legend

回答4:

We can use guide_legend(override.aes = aes(...)) to hide the 'a' in the legend.

Below is a short example of how you might use guide_legend()

library(ggrepel)
#> Loading required package: ggplot2

d <- mtcars[c(1:8),]

p <- ggplot(d, aes(wt, mpg)) +
  geom_point() +
  theme_classic(base_size = 18) +
  geom_label_repel(
    aes(label = rownames(d), fill = factor(cyl)),
    size = 5, color = "white"
  )

# Let's see what the default legend looks like.
p

# Now let's override some of the aesthetics:
p + guides(
  fill = guide_legend(
    title = "Legend Title",
    override.aes = aes(label = "")
  )
)

^{Created on 2019-04-29 by the reprex package (v0.2.1)}

来源：https://stackoverflow.com/questions/18337653/remove-a-from-legend-when-using-aesthetics-and-geom-text