Logical indexing in R Programming - Mini Project: Build & Apply

Logical indexing

📖 Scenario: You are working with a list of daily temperatures recorded in a city. You want to find which days were warm, meaning the temperature was above 20 degrees Celsius.

🎯 Goal: Build a program that uses logical indexing to select only the warm days from the temperature data.

📋 What You'll Learn

Create a numeric vector called temps with the exact values: 18, 22, 19, 25, 21, 17, 23

Create a logical vector called warm_days that is TRUE where temps is greater than 20

Use logical indexing with warm_days to create a vector called warm_temps containing only temperatures above 20

Print the warm_temps vector

💡 Why This Matters

🌍 Real World

Logical indexing is useful when you want to filter data based on conditions, like selecting only warm days from weather data.

💼 Career

Data analysts and scientists often use logical indexing to quickly extract relevant data for reports and decision making.

1

Create the temperature data vector

Create a numeric vector called temps with these exact values: 18, 22, 19, 25, 21, 17, 23

R Programming

# Create the temps vector with the given values
# Your code here

Need a hint?

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

2

Create a logical vector for warm days

Create a logical vector called warm_days that is TRUE where temps is greater than 20

R Programming

temps  20
# Your code here

Need a hint?

Use the comparison operator > to create a logical vector.

3

Select warm temperatures using logical indexing

Use logical indexing with warm_days to create a vector called warm_temps containing only temperatures above 20

R Programming

temps  20
# Create warm_temps vector by selecting temps where warm_days is TRUE
# Your code here

Need a hint?

Use square brackets [] with the logical vector to select elements.

4

Print the warm temperatures

Write a print statement to display the warm_temps vector

R Programming

temps  20
warm_temps <- temps[warm_days]
# Print warm_temps vector
# Your code here

Need a hint?

Use the print() function to show the vector.