R Programming Fundamentals

Using the apply() Function to Create Numeric Data Summaries

Herein, we will utilize the apply() function to summarize a dataset. In order to so, the following steps have to be executed:

1. Load the iris dataset using the following code:

data("iris") 

2. Find the mean of all of the columns of the iris dataset except the fifth column (the Species column, which isn't numeric) with the following code:

apply(iris[,-c(5)], 2, FUN = mean) 

3. Find the mean and variance of all of the columns of iris except the fifth column as follows:

apply(iris[,-c(5)], 2, function(x) c(mean(x), var(x))) 

4. Find the mean of all the rows of iris as follows:

apply(iris[,-c(5)], 1, FUN = mean)

Output: The following is the output we get as we execute the code mentioned ...