Reversing the Order of Legend
For Reversing the order of legend, we simply use rev() function as a value of levels parameter of factor function and inside rev() function, we assign the order of values that we want to reverse.
Syntax : rev(x)
Parameter :
- x : rev function has only one parameter, which represents the vector or other Data Object that we want to reverse its order, DF$Users in our example.
Return : Reversed order of its argument.
newDF$Users <- factor(newDF$Users, levels = rev(DF$Users))
R
# Load Packagelibrary("ggplot2")# Create a DataFrame DF <- data.frame(Year = c(2011, 2012, 2013, 2014, 2015), Points = c(30, 20, 15, 35, 50), Users = c("User1", "User2", "User3", "User4", "User5"))# Copy Old dataframe to New DataFrame.newDF <- DF# Reverse the order of Users column of DataFramenewDF$Users <- factor(newDF$Users, levels = rev(DF$Users))# Create ScatterPlot with new dataframe.ggplot(newDF,aes(Year, Points, color = Users))+ geom_point(size = 10) |
Output:
Scatter Plot with Reversed Order of ggplot2 Legend
Change Display Order of ggplot2 Plot Legend in R
In this article, we will see how to change display order of ggplot2 legend in R Programming Language.
For that, first we should load ggplot2 package using library() function. Syntax for loading or installing ggplot2 package is given below. to install ggplot2 package, write following command to R Console.
install.packages("ggplot2")
library("ggplot2")
To Create a plot, we use ggplot() function and for make it scatter plot we add geom_point() function to ggplot() function.
R
# Load Packagelibrary("ggplot2")# Create a DataFrame DF <- data.frame(Year = c(2011, 2012, 2013, 2014, 2015), Points = c(30, 20, 15, 35, 50), Users = c("User1", "User2", "User3", "User4", "User5"))# Create a Scatter Plotggplot(DF,aes(Year, Points, color = Users))+ geom_point(size = 10) |
Output:
Simple Scatter Plot with Legend