Turning Off Some Legends in a Ggplot

Turning off some legends in a ggplot

You can use guide = "none" in scale_..._...() to suppress legend.

For your example you should use scale_colour_continuous() because length is continuous variable (not discrete).

(p3 <- ggplot(mov, aes(year, rating, colour = length, shape = mpaa)) +
   scale_colour_continuous(guide = "none") +
   geom_point()
)

Or using function guides() you should set "none" for that element/aesthetic that you don't want to appear as legend, for example, fill, shape, colour.

p0 <- ggplot(mov, aes(year, rating, colour = length, shape = mpaa)) +
  geom_point()    
p0+guides(colour = "none")

UPDATE

Both provided solutions work in new ggplot2 version 3.3.5 but movies dataset is no longer present in this library. Instead you have to use new package ggplot2movies to check those solutions.

library(ggplot2movies)
data(movies)
mov <- subset(movies, length != "")

Remove extra legends in ggplot2

Aesthetics can be set or mapped within a ggplot call.

• An aesthetic defined within aes(...) is mapped from the data, and a legend created.
• An aesthetic may also be set to a single value, by defining it outside aes().

In this case, it appears you wish to set alpha = 0.8 and map colour = group.

To do this,

Place the alpha = 0.8 outside the aes() definition.

g <- ggplot(df, aes(x = x, y = y, group = group))
g <- g + geom_line(aes(colour = group))
g <- g + geom_point(aes(colour = group), alpha = 0.8)
g

For any mapped variable you can supress the appearance of a legend by using guide = 'none' in the appropriate scale_... call. eg.

g2 <- ggplot(df, aes(x = x, y = y, group = group)) + 
        geom_line(aes(colour = group)) +
        geom_point(aes(colour = group, alpha = 0.8))
g2 + scale_alpha(guide = 'none')

Which will return an identical plot

EDIT
@Joran's comment is spot-on, I've made my answer more comprehensive

How to suppress legends with ggplot

Have you tried some of the these?

Remove legend from a particular aesthetic:

plot + guides(colour=FALSE)

or

Remove legend inside geom_line():

geom_line(aes(...), show.legend = FALSE))

Remove legend in ggplot

I couldn't run your code, but I rebuilt it with iris.

Like Matt suggested, one thing would be, remove fill=F:

ggplot(data=iris, aes(x = SepalLength , y = PetalLength, group=Name)) +
  geom_point() +
  geom_line() +
  stat_smooth(method = "loess",se = T, aes(color=Name)) +
  geom_ribbon(aes(ymin = 1, ymax = 3),alpha = 1/5) +
  scale_x_continuous(breaks = 0:2, labels = c(0, 6, 12)) 

Or if you need it for some reason, use guides(fill="none"):

ggplot(data=iris, aes(x = SepalLength , y = PetalLength, group=Name)) +
  geom_point() +
  geom_line() +
  stat_smooth(method = "loess",se = T, aes(color=Name)) +
  geom_ribbon(aes(ymin = 1, ymax = 3, fill=FALSE),alpha = 1/5) +
  scale_x_continuous(breaks = 0:2, labels = c(0, 6, 12)) +
  guides(fill="none")

Output:

Remove some legend entries in ggplot

Use a named values argument:

ggplot(mtcars) + 
  geom_col(aes(x = 1:nrow(mtcars), y = disp, fill = paste(cyl))) +
  scale_fill_manual(values = c("4" = "red", "6" = "green", "8" = "blue"),
                    breaks = c("4"))

Remove n legend from ggplot

You can control legends with the show.legend parameter, with fine control by using a named vector:

show.legend

logical. Should this layer be included in the legends?
NA, the default, includes if any aesthetics are mapped. FALSE never
includes, and TRUE always includes. It can also be a named logical
vector to finely select the aesthetics to display.

The trick is to recognise that the n part of the legend comes from the size aesthetic.

ggplot(iris,aes(x=Sepal.Length,y=Sepal.Width,fill=Species))+
+    geom_bar(stat="sum", show.legend=c(size=FALSE))

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