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How to change the color of points for ggplot2 scatterplot using color brewer in R?
To change the color of points for ggplot2 scatterplot using color brewer in R, we can follow the below steps −
- First of all, create a data frame.
- Then, create the point chart with default colors.
- After that, use scale_colour_brewer function to create the point chart.
Create the data frame
Let's create a data frame as shown below −
x<-sample(1:50,25) y<-sample(1:50,25) Group=sample(1:4,25,replace=TRUE) df<-data.frame(x,y,Group) df
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
x y Group 1 23 8 2 2 49 11 2 3 19 30 3 4 35 50 4 5 41 15 2 6 11 9 1 7 3 43 3 8 34 6 1 9 33 5 1 10 32 3 3 11 37 2 1 12 4 41 2 13 6 48 4 14 26 44 4 15 15 40 2 16 47 19 3 17 28 16 4 18 43 35 3 19 39 42 1 20 38 32 3 21 8 25 3 22 22 14 4 23 46 46 1 24 25 21 2 25 45 20 3
Create the point chart with default colors
Loading ggplot2 package and creating the point chart between x and y based on values in Group column −
x<-sample(1:50,25) y<-sample(1:50,25) Group=sample(1:4,25,replace=TRUE) df<-data.frame(x,y,Group) library(ggplot2) ggplot(df,aes(x,y,col=Group))+geom_point()
Output
Create the point chart with color brewer
Use scale_colour_brewer function of the ggplot2 package to create the point chart between x and y based on values in Group column −
x<-sample(1:50,25) y<-sample(1:50,25) Group=sample(1:4,25,replace=TRUE) df<-data.frame(x,y,Group) library(ggplot2) ggplot(df,aes(x,y,col=factor(Group)))+geom_point()+scale_colour_brewer(palette="Spec tral")
Output
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