R Increase or Decrease ggplot2 Point Border Thickness (Example Code)

In this tutorial you’ll learn how to modify the thickness of point borders in a ggplot2 scatterplot in R.

Preparing the Example

data(iris)                      # Loading iris 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
install.packages("ggplot2")       # Install ggplot2 package
library("ggplot2")                # Load ggplot2
ggplot(iris,                    # Draw ggplot2 scatterplot of iris
       aes(Sepal.Length,
           Sepal.Width)) +
  geom_point(fill = "green",
             color = "orange",
             shape = 21,
             size = 5)

r graph figure 1 r increase or decrease ggplot2 point border thickness

Example: Control the Size of ggplot2 Point Borders

ggplot(iris,                    # Increased border size
       aes(Sepal.Length,
           Sepal.Width)) +
  geom_point(fill = "green",
             color = "orange",
             shape = 21,
             size = 5,
             stroke = 3)        # Using stroke argument

r graph figure 2 r increase or decrease ggplot2 point border thickness

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