How to build Plot Histogram in R with multiple variables?

Question

Anyone help me to build histogram of this dataset?

dat2 <- data.frame(mean_setosa, mean_versicolor, mean_virginica)

Thank you!

enter image description here

Answer 1

You could use barplot :

d <- aggregate(Petal.Length~Species, data = iris, FUN = mean)

     Species Petal.Length
1     setosa        1.462
2 versicolor        4.260
3  virginica        5.552


barplot(Petal.Length~Species, data = d)

Using the ggplot2 graphical package, you can do:

library(ggplot2)

ggplot(d, aes(x = Species, y = Petal.Length))+
  geom_col()