The ggplot2 library allows to make a boxplot using geom_boxplot(). Please note that you have to specify a quantitative variable for the Y axis, and a qualitative variable for the X axis ( a group).
See graph #263 to learn how to custom it.
# The mtcars dataset is proposed in R
# A really basic boxplot.
ggplot(mtcars, aes(x=as.factor(cyl), y=mpg)) +
geom_boxplot(fill="slateblue", alpha=0.2) +
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