Remove Legend Ggplot 2.2

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 != "")

Removing one of two ggplot legends

Use the following code

ggplot(df, aes(x=factor(IR), y=misclass, colour = as.factor(resample),group=as.factor(resample))) +
  geom_line(lwd=1) +
  geom_point(shape=24,size=3,aes(color=as.factor(resample),fill=as.factor(resample)), show.legend = F) +hw+
  scale_y_continuous(breaks=seq(0,0.15,0.025))+
  scale_x_discrete(breaks=2^(0:7),labels=c("1","2","4","8","16","32","64","128"))+
  labs(x="Imbalance Ratio",y="Risk")+
  guides(colour=guide_legend(title="Resampling\nTechnique"))

I have added , show.legend = F in geom_point to remove the extra legend.

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))

hide a legend with ggplot

Add theme(legend.position="none"), like this:

ggplot(data=PlantGrowth, aes(x=group, y=weight, fill=group)) + 
  geom_boxplot() + 
  theme(legend.position="none")

(source)

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:

How to delete legend in ggplot with reression model?

This should work in lack of reproducible data. Be careful that functions like theme_bw() use to remove previous theme() settings as mentioned by @Ronald. So it is better to add in the final part of the plot. For shapes, you can enable shape in aes() like this and format with scale_shape_manual() (the numbers inside belong to the shape you want):

library(ggplot2)
#Code
ggplot(data=x, aes(x=agw, y=pgw)) + 
  geom_point (data=x, aes(x=agw, y=pgw, color=Nitrogen,shape=Nitrogen,size=3)) + 
  stat_smooth(method = 'lm', se=FALSE, color="Black") +
  scale_color_manual(values = c("Dark gray","Black")) +
  scale_shape_manual(values = c(1,15))+
  geom_text(x=30, y=70, label="", size=3.5, col="Black") + 
  geom_text(x=30, y=60, label="", size=3.5, col="Black") +
  scale_x_continuous(breaks = seq(0,80,10),limits = c(0,80)) +
  scale_y_continuous(breaks = seq(0,80,10), limits = c(0,80)) +
  theme_bw() +
  theme(panel.grid = element_blank(),
        legend.position = 'none')

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