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Change the outline color for histogram bars using ggplot2 in R.
To change the outlines color of histogram bars using ggplot2, we can use col argument inside geom_histogram function of ggplot2 package.
For Example, if we have a data frame called df that contains a column say X then we can create the histogram of X with different outline color of bars using the below command −
ggplot(df,aes(X))+geom_histogram(bins=30,col=I("red"))Example
Following snippet creates a sample data frame −
x<-rnorm(20000) df<-data.frame(x) head(df,20)
The following dataframe is created −
x 1 -1.31426410 2 -2.62316895 3 -0.19231545 4 0.89701476 5 -0.10409584 6 0.23481007 7 1.53117888 8 -0.63855632 9 0.85309492 10 0.04791316 11 0.37854603 12 1.24928336 13 -0.65170883 14 2.58938742 15 -0.82602063 16 0.97524621 17 0.36930032 18 0.07720108 19 -0.66050878 20 0.66199644
To load the ggplot2 package and to create a histogram of x, on the above created data frame, add the following code to the above snippet −
x<-rnorm(20000) library(ggplot2) ggplot(df,aes(x))+geom_histogram(bins=30)
Output
If you execute all the above given snippets as a single program, it generates the following Output −
To create a histogram of x with red colored outline of bars, on the above created data frame, add the following code to the above snippet −
x<-rnorm(20000)
library(ggplot2)
ggplot(df,aes(x))+geom_histogram(bins=30,col=I("red"))Output
If you execute all the above given snippets as a single program, it generates the following Output −
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