Set Range of ggplot2 scale_color_gradientn Manually in R (Example Code)

This article explains how to specify the color gradient range of a ggplot2 plot manually in R.

Preparing the Example

data(iris)                    # Loading data set
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 package
ggp <- ggplot(iris,           # ggplot2 geom_tile plot
              aes(x = Sepal.Length,
                  y = Sepal.Width,
                  fill = Petal.Length)) +
  geom_tile()
ggp

r graph figure 1 set range ggplot2 scale_color_gradientn manually r

Example: Applying scale_fill_gradientn() Function to Specify Color Ranges

ggp +                         # Specifying color ranges
  scale_fill_gradientn(colors = c(1:5),
                       limits = c(- 1, 3),
                       breaks = c(- 1, 0, 1, 2, 3))

r graph figure 2 set range ggplot2 scale_color_gradientn manually r

Related Articles & Further Resources

Have a look at the following R tutorials. They illustrate topics such as coding errors, graphics in R, colors, and ggplot2.

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