How to change the color of points for ggplot2 scatterplot using color brewer in R?

R Programming Server Side Programming Programming

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

Nizamuddin Siddiqui

Published on 10-Aug-2021 09:44:02

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