Machine Learning with R Cookbook - Second Edition

How to do it...

Perform the following steps to visualize a dataset:

1. Load the iris data into the R session:

        > data(iris)  

2. Calculate the frequency of species within the iris using the table command:

        > table.iris = table(iris$Species)
        > table.iris
        Output:
              setosa versicolor  virginica 
         50         50         50 

3. As the frequency in the table shows, each species represents 1/3 of the iris data. We can draw a simple pie chart to represent the distribution of species within the iris:

        > pie(table.iris)
        Output:

The pie chart of species distribution

4. The histogram creates a frequency plot of sorts along the x-axis. The following example produces a histogram ...