ggplot2: why are side-by-side boxplots not being plotted?

set.seed(3)  df <- data.frame(lambda = c(rep(0, 6), rep(1, 6), rep(1.5, 6)),                   approach = rep(c(rep("A", 3), rep("B", 3)), 3),                   value = rnorm(18, 0, 1))    ggplot(data = df, aes(x = lambda, y = value)) + geom_boxplot(aes(fill = approach))  

I want to plot 3 sets of boxplots at lambda = 0, 1, and 1.5, respectively. Within each set are 2 boxplots, one corresponds to approach A and the other to approach B. However, the current code is only plotting two boxplots, whereas I'm looking for a total of six.

https://stackoverflow.com/questions/66739410/ggplot2-why-are-side-by-side-boxplots-not-being-plotted March 22, 2021 at 09:55AM