Removing legend name [duplicate]

Question

I have a dataframe which is as follows:

X Y Variable 0.351 4.453 a 0.352 4.423 a 0.353 4.422 a ... ... ... ... ... ... ... ... ... 0.351 5.656 b 0.352 5.431 b 0.353 5.222 b

And so on for different variables. I'll keep it short with 2 variables in the example.

I plotted the dataframe and I want a legend which shows the variable names but not the legend title.

ggplot(data=df, aes(x=df$X, y=df$Y, color=df$Variable))+ geom_line(size=1)+ labs(x = "x", y = "y") + theme_bw()

This gives a simple but clean graph, with a legend. But then I want to change the labels in the legend that shows up, remove the legend title, and change the color of the lines with scale_color_manual options. I can change the colors but I couldn't manage to do the other things because the legend disappears.

ggplot(data=df, aes(x=df$X, y=df$Y, color=df$Variable))+ geom_line(size=1)+ labs(x = "x", y = "y") + scale_color_manual(values=c("green","red") breaks=c("a","b")) + theme_bw()

I know in the last code there is a missing option for the legend title. What am I doing wrong?

Both answers were useful in their own way, thank you both.

D.K.
– D.K.

2019-04-25 17:04:46 +00:00
Commented Apr 25, 2019 at 17:04 — D.K.
– D.K., Commented Apr 25, 2019 at 17:04

Dan · Accepted Answer · 2019-04-25 16:42:16Z

Here's an example of how to alter the legend title and labels. To remove the title completely, you can set name = NULL.

# Create data frame df <- read.table(text = "X Y Variable 0.351 4.453 a 0.352 4.423 a 0.353 4.422 a 0.351 5.656 b 0.352 5.431 b 0.353 5.222 b", header = TRUE) # Load libraries library(ggplot2) # Plot results ggplot(data=df, aes(x=df$X, y=df$Y, color=df$Variable))+ geom_line(size=1)+ labs(x = "x", y = "y") + scale_color_manual(values=c("green","red"), breaks=c("a","b"), labels = c("Label one", "Label two"), name = "My Legend Title") + theme_bw()

^{Created on 2019-04-25 by the reprex package (v0.2.1)}

Community · Accepted Answer · 2020-06-20 09:12:55Z

You can remove your legend title with labs(color="") since the color aes gives your legend the name:

library(ggplot2) ggplot(data=df, aes(x=df$X, y=df$Y, color=df$Variable))+ geom_line(size=1)+ labs(x = "x", y = "y", color = NULL) + theme_bw()

Plot:

Also working:

scale_color_discrete(name = NULL)

For further information check this thread here

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