How to change the color of X-axis label using ggplot2 in R?

The default color of labels is black but we might want to change that color to something else so that we can get attention of the viewer to the labels if it is needed. To change the color of X-axis label using ggplot2, we can use theme function that has axis.title.x argument which can be used for changing the color of the label values.

Example

Consider the below data frame −

 Live Demo

x<−rnorm(20,5,0.25)
y<−rnorm(20,5,0.004)
df<−data.frame(x,y)
df

Output

      x       y
1 5.030380 4.997751
2 5.240119 4.998680
3 4.544677 4.999195
4 4.858193 4.998952
5 5.071308 5.001092
6 5.512129 4.998037
7 5.236292 5.002558
8 5.081739 5.001903
9 4.940688 5.005155
10 4.437274 5.002876
11 5.472674 4.997229
12 4.813980 5.005284
13 4.859050 4.993907
14 5.353379 4.998850
15 5.537771 4.988465
16 5.302592 4.999421
17 5.486402 4.991891
18 5.121558 5.003857
19 4.908864 5.003393
20 5.137028 5.008340

Loading ggplot2 package and creating a scatterplot −

Example

library(ggplot2)
ggplot(df,aes(x,y))+geom_point()

Output

Creating the scatterplot with X-axis label in red color −

Example

ggplot(df,aes(x,y))+geom_point()+theme(axis.title.x=element_text(colour="red"))

Output