Why matrices handle tabular math in R Programming - See It in Action

Why matrices handle tabular math

📖 Scenario: Imagine you run a small shop and you want to keep track of how many items you sold each day. You have two products and three days of sales data. Using a matrix helps you organize this data in rows and columns, just like a table.

🎯 Goal: You will create a matrix to hold sales data, set up a threshold for good sales, find which sales are above that threshold using matrix operations, and finally print the result.

📋 What You'll Learn

Create a matrix called sales with 2 rows and 3 columns using the exact values: 5, 8, 6, 7, 3, 9

Create a variable called threshold and set it to 6

Create a logical matrix called good_sales that is TRUE where sales values are greater than threshold

Print the good_sales matrix

💡 Why This Matters

🌍 Real World

Matrices help organize and analyze tabular data like sales, temperatures, or survey results efficiently.

💼 Career

Understanding matrices and their operations is useful in data analysis, statistics, and many programming jobs involving data.

1

Create the sales matrix

Create a matrix called sales with the values 5, 8, 6, 7, 3, 9 arranged in 2 rows and 3 columns using the matrix() function.

R Programming

# Create the sales matrix with 2 rows and 3 columns
# Your code here

Need a hint?

Use matrix(c(5, 8, 6, 7, 3, 9), nrow = 2, ncol = 3, byrow = TRUE) to create the matrix with the exact values.

2

Set the sales threshold

Create a variable called threshold and set it to the number 6.

R Programming

sales <- matrix(c(5, 8, 6, 7, 3, 9), nrow = 2, ncol = 3, byrow = TRUE)
# Create the threshold variable and set it to 6
# Your code here

Need a hint?

Just write threshold <- 6 to create the variable.

3

Find good sales with matrix comparison

Create a logical matrix called good_sales that is TRUE where the sales matrix values are greater than the threshold variable.

R Programming

sales  threshold
# Your code here

Need a hint?

Use the comparison operator > between sales and threshold to get a logical matrix.

4

Print the good sales matrix

Print the good_sales matrix to see which sales are above the threshold.

R Programming

sales  threshold
# Print the good_sales matrix
# Your code here

Need a hint?

Use print(good_sales) to show the matrix.