Negative indexing for exclusion in R Programming - Mini Project: Build & Apply

Negative indexing for exclusion

📖 Scenario: You have a list of fruits, but you want to create a new list that excludes some specific fruits by their positions.

🎯 Goal: Learn how to use negative indexing in R to exclude elements from a vector.

📋 What You'll Learn

Create a vector with exact fruit names

Create a vector with exact positions to exclude

Use negative indexing to exclude those positions

Print the resulting vector

💡 Why This Matters

🌍 Real World

Negative indexing is useful when you want to remove unwanted items from a list, like filtering out certain products or data points.

💼 Career

Data analysts and programmers often need to exclude specific data entries quickly and efficiently using indexing techniques.

1

Create the fruits vector

Create a vector called fruits with these exact values in order: "apple", "banana", "cherry", "date", "elderberry".

R Programming

# Create the fruits vector with the exact fruits
# Your code here

Need a hint?

Use the c() function to combine the fruit names into a vector.

2

Create the exclude positions vector

Create a vector called exclude_positions with the exact values 2 and 4 to represent the positions of fruits to exclude.

R Programming

fruits <- c("apple", "banana", "cherry", "date", "elderberry")
# Create the exclude_positions vector with 2 and 4
# Your code here

Need a hint?

Use the c() function to create a vector with the numbers 2 and 4.

3

Exclude fruits using negative indexing

Create a new vector called selected_fruits by excluding the positions in exclude_positions from fruits using negative indexing.

R Programming

fruits <- c("apple", "banana", "cherry", "date", "elderberry")
exclude_positions <- c(2, 4)
# Use negative indexing to exclude positions 2 and 4 from fruits
# Your code here

Need a hint?

Use -exclude_positions inside the square brackets to exclude those positions.

4

Print the selected fruits

Print the selected_fruits vector to show the fruits after exclusion.

R Programming

fruits <- c("apple", "banana", "cherry", "date", "elderberry")
exclude_positions <- c(2, 4)
selected_fruits <- fruits[-exclude_positions]
# Print the selected_fruits vector
# Your code here

Need a hint?

Use the print() function to display the vector.