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How to create bar plot with gradient colors using ggplot2 in R?
To create bar plot with gradient colors using ggplot2, we can use scale_fill_gradient function where we can set the lower and higher color values.
For Example, if we have a data frame called df that contains two columns say Cat and Count then we can create the bar plot with gradient colors by using the below command −
ggplot(df,aes(Cat,Count,fill=Cat))+geom_bar(stat="identity")+scale_fill_gradient(low="blue",high="red")
Example
Following snippet creates a sample data frame −
x<-LETTERS[1:5] y<-c(27,25,24,21,20) df<-data.frame(x,y) df
The following dataframe is created
x y 1 A 27 2 B 25 3 C 24 4 D 21 5 E 20
To load ggplot2 package and create bar plot for data in df on the above created data frame, add the following code to the above snippet −
x<-LETTERS[1:5] y<-c(27,25,24,21,20) df<-data.frame(x,y) library(ggplot2) ggplot(df,aes(x,y))+geom_bar(stat="identity")
Output
If you execute all the above given snippets as a single program, it generates the following Output −
To create bar plot for data in df having bars filled with gradient color on the above created data frame, add the following code to the above snippet −
x<-LETTERS[1:5] y<-c(27,25,24,21,20) df<-data.frame(x,y) library(ggplot2) ggplot(df,aes(x,y,fill=y))+geom_bar(stat="identity")+scale_fill_gradient(low="blue",high="red")
Output
If you execute all the above given snippets as a single program, it generates the following Output −
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