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How to change the legend title in ggplot2 in R?
In ggplot2, by default the legend title is the title of the grouping column of the data frame. If we want to change that title then scale_color_discrete function. For example, if we have a data frame called df that contains two numerical columns x and y and one grouping column say group then the scatterplot with a different legend title can be created by using the below command −
ggplot(df,aes(x,y,color=group))+geom_point()+scale_color_discrete("Gender")
Example
Consider the below data frame −
> x<-rnorm(20) > y<-rnorm(20) > grp<-sample(c("Male","Female"),20,replace=TRUE) > df<-data.frame(x,y,grp) > df
Output
x y grp 1 -2.27846496 0.8121008 Male 2 -1.75112768 -0.1718679 Female 3 -0.12504696 -0.3265867 Female 4 0.10895490 -0.2015613 Female 5 -1.51196132 0.8480887 Male 6 1.68028497 -1.1329240 Male 7 -0.65238760 -0.9495177 Male 8 0.84725937 1.4825983 Female 9 0.53645228 2.1630524 Female 10 -2.04814594 0.4503883 Female 11 -0.37741279 -1.1621875 Male 12 0.79303416 -0.1804637 Male 13 -0.02095395 -0.9740427 Male 14 0.61453646 1.0327821 Female 15 -0.32875489 -0.4071753 Male 16 0.94227215 2.0651996 Female 17 1.79740910 0.8630703 Male 18 1.09133101 -0.1053076 Male 19 0.33748223 -0.1238961 Female 20 -0.10264760 1.5338488 Male
Loading ggplot2 package and creating a point chart between x and y with grouping of grp −
> library(ggplot2) > ggplot(df,aes(x,y,color=grp))+geom_point()
Output
Creating a point chart between x and y with grouping of grp and legend title Gender −
> ggplot(df,aes(x,y,color=grp))+geom_point()+scale_color_discrete("Gender")
Output
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