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Keep Unused Factor Levels in ggplot2 Barplot in R

  • Last Updated : 29 Jun, 2021
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In this article, we will discuss how to keep unused factor levels in ggplot2 barplot in the R programming language.

In this approach to keep unused factor levels in ggplot2 barplot, the user first needs to install and import the ggplot2 package in the R console and plot the barplot of the data consisting of zero values with the geom_bar() and ggplot() function called with the required parameters and then call the scale_x_discrete() function with the drop argument to be set as false form the ggplot2 package to keep unused factor levels in the R programming language.

Syntax:

scale_x_discrete(…, expand = waiver())

Parameter:



  • …: common discrete scale parameters: name, breaks, labels, na.value, limits and guide.
  • expand: a numeric vector of length two giving multiplicative and additive expansion constants. These constants ensure that the data is placed some distance away from the axes.

Example 1:

R




library("ggplot2"
gfg <- data.frame(x = c('A','B','C','D','E','F'),        
                   y = c(3, 0, 0, 1, 0,2))
                             
ggp <- ggplot(gfg, aes(x, y, fill = x)) +  geom_bar(stat = "identity")
           
ggp +  scale_x_discrete(drop = FALSE)
  
ggp

Output:

Example 2:

R




library("ggplot2"
  
  
gfg <- data.frame(x = c('A','B','C','D','E','F','G','H','I'),        
                  y = c(1,0,1,0,1,0,1,0,1))
  
ggp <- ggplot(gfg, aes(x, y, fill = x)) +  geom_bar(stat = "identity")
  
ggp +  scale_x_discrete(drop = FALSE)
    
ggp

Output:




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