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How to Highlight a Bar in Barplot in R?

  • Last Updated : 18 Oct, 2021

In this article, we will discuss how to highlight a bar in barplot in R Programming language. 

First, let’s create a basic barplot with no bars highlighted using ggplot2. 

R




# Create sample data
set.seed(5642)                            
sample_data <- data.frame(name = c("Geek1","Geek2",
                                   "Geek3","Geek4",
                                   "Geeek5") ,
                          value = c(31,12,15,28,45),
                         highlight= c(0,0,1,0,0) )
# Load ggplot2 package
library("ggplot2")
 
# Create bar plot
plot<-ggplot(sample_data,
             aes(name,value)) +
        geom_bar(stat = "identity")
plot

 

 



Output:

 

Highlighting bar in barplot

 

To create automated color in bars we use the fill property of the ggplot2 plot. We use a vector with the same value for all the bars except the one that needs to be highlighted.

 

R




# Create sample data
set.seed(5642)                            
sample_data <- data.frame(name = c("Geek1","Geek2",
                                   "Geek3","Geek4",
                                   "Geeek5") ,
                          value = c(31,12,15,28,45),
                         highlight= c(0,0,1,0,0) )
# Load ggplot2 package
library("ggplot2")
 
# Create bar plot
plot<-ggplot(sample_data,
             aes(name, value, fill=highlight)) +
        geom_bar(stat = "identity")
plot

 



 

Output:

 

Highlighting specific bar in barplot

 

To create manual color in bars we use the fill property of the ggplot2 plot with scale_fill_manual() function. We use a vector with the same value for all the bars except the one that needs to be highlighted and then we define a color for each value so every bar is colored according to the value specified to it:

 

R




# Create sample data
set.seed(5642)                            
sample_data <- data.frame(name = c("Geek1","Geek2",
                                   "Geek3","Geek4",
                                   "Geeek5") ,
                          value = c(31,12,15,28,45),
                         highlight= c("0","0","1","0","0") )
# Load ggplot2 package
library("ggplot2")
 
# Create bar plot with highlighted bar
plot<-ggplot(sample_data,
             aes(name,value,fill=highlight)) +
        geom_bar(stat = "identity")+
        scale_fill_manual( values = c( "1"="green", "0"="darkgray" ),
                          guide = FALSE )
plot

 

 

Output:

 

 




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