How to highlight text inside a plot created by ggplot2 using a box in R?

There might be many ways to highlight text inside a plot but the easiest one would be using geom_label function of ggplot2 package, with the help of this function we can put the required text and the aesthetics of that text by using a single line of code. It is highly recommended that we should use geom_label function with desired specifications.

Example

 Live Demo

Consider the below data frame −

set.seed(222)
x<−rnorm(5000,4,1)
df<−data.frame(x)
head(df,20)

Output

   x
1 5.487757
2 3.998108
3 5.381021
4 3.619786
5 4.184136
6 3.753104
7 2.784439
8 5.561405
9 4.427310
10 2.798976
11 5.052458
12 2.694936
13 3.307392
14 4.602649
15 3.802247
16 2.814125
17 1.994487
18 4.007510
19 4.519490
20 3.253705
tail(df,20)
   x
4981 4.555400
4982 5.335003
4983 5.461943
4984 4.026777
4985 4.001629
4986 4.244421
4987 2.711058
4988 5.611044
4989 4.752044
4990 2.988279
4991 4.007473
4992 2.951105
4993 3.981081
4994 5.526550
4995 4.602384
4996 4.908750
4997 3.568487
4998 3.276785
4999 4.303017
5000 2.663639

Loading ggplot2 package and creating histogram of x with highlighted text inside the plot −

library(ggplot2)
ggplot(df,aes(x))+geom_histogram(bins=30)+geom_label(aes(x=6,y=450,label="Normal Distribution"),fill="red")

Output

Nizamuddin Siddiqui

Updated on: 06-Nov-2020

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