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How to change legend values in a bar plot created by using ggplot2 in R?
How to change legend values in a bar plot created by using ggplot2 in R?
By default, the legend values are taken as the different levels of the categorical variable for which a bar plot is created using ggplot2 package and if we want to change those values then scale_color_manual function of the ggplot2 package can be used where we need to pass the values for color and labels for legend values.
Example
Consider the below data frame:
> set.seed(1214) > x1<-sample(LETTERS[1:4],20,replace=TRUE) > y1<-rpois(20,5) > df1<-data.frame(x1,y1) > df1
Output
x1 y1 1 B 4 2 B 5 3 C 5 4 C 8 5 A 4 6 B 8 7 C 6 8 C 5 9 C 2 10 A 6 11 A 9 12 D 5 13 D 8 14 D 8 15 B 3 16 D 1 17 D 3 18 D 6 19 D 3 20 C 4
Loading ggplot2 package and creating bar plot for x1 with y1 as frequencies:
> library(ggplot2) > ggplot(df1,aes(x1,y1,color=x1))+geom_point()
Creating the bar plot with different legend values:
> ggplot(df1,aes(x1,y1,color=x1))+geom_point()+scale_color_manual(values=c("green","red","blue","black"),labels=c("First","Second","Third","Fourth"))
Output:
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