Matrix dimensions in R Programming - Mini Project: Build & Apply

Matrix dimensions

📖 Scenario: You are working with a simple matrix in R, which is like a table of numbers arranged in rows and columns. Understanding the size of this matrix helps you know how many rows and columns it has.

🎯 Goal: You will create a matrix with specific numbers, then find out how many rows and columns it has using R functions.

📋 What You'll Learn

Create a matrix with exact values

Use a variable to store the matrix

Use R functions to find the number of rows and columns

Print the number of rows and columns

💡 Why This Matters

🌍 Real World

Matrices are used in data analysis, statistics, and scientific computing to organize and manipulate data in rows and columns.

💼 Career

Knowing how to handle matrix dimensions is important for data scientists, statisticians, and anyone working with numerical data in R.

1

Create the matrix

Create a matrix called my_matrix with the numbers 1 to 6 arranged in 2 rows and 3 columns using the matrix() function.

R Programming

# Create the matrix my_matrix with numbers 1 to 6 in 2 rows and 3 columns
# Your code here

Need a hint?

Use matrix(1:6, nrow = 2, ncol = 3) to create the matrix.

2

Store the number of rows

Create a variable called num_rows and set it to the number of rows in my_matrix using the nrow() function.

R Programming

my_matrix <- matrix(1:6, nrow = 2, ncol = 3)
# Create num_rows to store the number of rows in my_matrix
# Your code here

Need a hint?

Use nrow(my_matrix) to get the number of rows.

3

Store the number of columns

Create a variable called num_cols and set it to the number of columns in my_matrix using the ncol() function.

R Programming

my_matrix <- matrix(1:6, nrow = 2, ncol = 3)
num_rows <- nrow(my_matrix)
# Create num_cols to store the number of columns in my_matrix
# Your code here

Need a hint?

Use ncol(my_matrix) to get the number of columns.

4

Print the dimensions

Print the number of rows and columns stored in num_rows and num_cols using two separate print() statements.

R Programming

my_matrix <- matrix(1:6, nrow = 2, ncol = 3)
num_rows <- nrow(my_matrix)
num_cols <- ncol(my_matrix)
# Print num_rows and num_cols
# Your code here

Need a hint?

Use print(num_rows) and print(num_cols) to show the results.