Program 9

Create multiple histograms using ggplot2 ::facet_wrap() to visualize how a variable(e.g., Sepal.length) is distributed across different groups (e.g.,species) in a built-in R data set.

Step 1: Load required libraries

library(ggplot2)

Warning: package 'ggplot2' was built under R version 4.4.3

Step 2:Load dataset

data(iris) #load the first iris dataset
head(iris) #view the first few rows

  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

Step 3: Create histogram using facet_wrap for grouped data

ggplot(iris, aes(x = Sepal.Length)) +
  geom_histogram(binwidth = 0.4, fill = "pink", color = "black") +
  facet_wrap(~ Species) + # Facet by Species
  labs(title = "Distribution of Sepal Length by Species",
       x = "Sepal Length (cm)",
       y = "Frequency")+
   theme_minimal()