Display NA Group Values in Scatterplot with ggplot2 Using Color Brewer in R

To display NA group values in scatterplot created with ggplot2 using color brewer in R, we can follow the below steps −

• First of all, create a data frame.
• Then, create the scatterplot with default colors.
• After that, use scale_color_brewer function to create the scatterplot with color of points (including NA) based on color palette given in scale_color_brewer.

Create the data frame

Let's create a data frame as shown below −

 Live Demo

x<-sample(1:50,25)
y<-sample(1:50,25)
Group<-sample(c("First","Second","NA"),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  46 11 NA
2  32 47 NA
3  23 26 NA
4  26 28 First
5  3  36 First
6  33 49 NA
7  38 3  Second
8  14 10 Second
9  30 39 Second
10 11 14 Second
11 34 8  NA
12 18 21 NA
13 2  31 First
14 9  32 First
15 20 38 First
16 5  50 Second
17 29 34 Second
18 19 43 NA
19 4  20 First
20 17 46 First
21 31 4  First
22 1  24 Second
23 24 6  Second
24 42 29 NA
25 15 41 Second

Create the scatterplot with default colors

Using geom_point function of ggplot2 package to create the scatterplot between x and y −

x<-sample(1:50,25)
y<-sample(1:50,25)
Group<-sample(c("First","Second","NA"),25,replace=TRUE)
df<-data.frame(x,y,Group)
library(ggplot2)
ggplot(df,aes(x,y,col=Group))+geom_point()

Output

Create the scatterplot with points color based on color palette in scale_color_brewer

Adding scale_color_brewer function ggplot function and creating the scatterplot −

x<-sample(1:50,25)
y<-sample(1:50,25)
Group<-sample(c("First","Second","NA"),25,replace=TRUE)
df<-data.frame(x,y,Group)
library(ggplot2)
ggplot(df,aes(x,y,col=Group))+geom_point()+scale_color_brewer(palette="Set3")

Output