Use Data Frame Row Indices as X in ggplot2 Plot in R (Example Code)
In this article, I’ll explain how to set the row indices of a data frame as x-values in a ggplot2 plot in the R programming language.
Creation of Example Data
data(iris) # Example data frame head(iris) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 5.1 3.5 1.4 0.2 setosa # 2 4.9 3.0 1.4 0.2 setosa # 3 4.7 3.2 1.3 0.2 setosa # 4 4.6 3.1 1.5 0.2 setosa # 5 5.0 3.6 1.4 0.2 setosa # 6 5.4 3.9 1.7 0.4 setosa |
Example: Specifying Row Index as X-Values in ggplot2 Graphic
install.packages("ggplot2") # Install ggplot2 package library("ggplot2") # Load ggplot2 |
ggplot(iris, # Using index as x aes(x = 1:nrow(iris), y = Sepal.Length)) + geom_point() |
Further Resources & Related Articles
Please find some additional R tutorials on topics such as variables, graphics in R, ggplot2, and dates in the following list: