Why visualization reveals patterns in MATLAB - See It in Action

Why visualization reveals patterns

📖 Scenario: Imagine you have collected data about daily temperatures over a week. You want to understand if there is any pattern or trend in the temperatures.

🎯 Goal: You will create a simple MATLAB program that stores temperature data, sets up a threshold to highlight hot days, uses a loop to find these days, and finally plots the temperatures to visually reveal the pattern.

📋 What You'll Learn

Create a vector called temperatures with the exact values: 22, 25, 27, 30, 28, 26, 24

Create a variable called hot_threshold and set it to 27

Use a for loop with variable i to iterate over the indices of temperatures

Inside the loop, check if temperatures(i) is greater than hot_threshold and store the result in a logical vector hot_days

Plot the temperatures vector with days on the x-axis and temperatures on the y-axis

Highlight the hot days on the plot with red circles

💡 Why This Matters

🌍 Real World

Scientists and analysts often use visualization to quickly see patterns in data that numbers alone might hide.

💼 Career

Data analysts, engineers, and researchers use MATLAB plotting to communicate findings clearly and make decisions based on visual patterns.

1

Create the temperature data vector

Create a vector called temperatures with these exact values: [22, 25, 27, 30, 28, 26, 24]

MATLAB

% Your code here

Need a hint?

Use square brackets [] to create a vector in MATLAB.

2

Set the hot day temperature threshold

Create a variable called hot_threshold and set it to 27

MATLAB

temperatures = [22, 25, 27, 30, 28, 26, 24];
% Your code here

Need a hint?

Just assign the number 27 to the variable hot_threshold.

3

Find hot days using a for loop

Use a for loop with variable i to iterate over the indices of temperatures. Inside the loop, check if temperatures(i) is greater than hot_threshold and store the result in a logical vector called hot_days

MATLAB

temperatures = [22, 25, 27, 30, 28, 26, 24];
hot_threshold = 27;
% Your code here

Need a hint?

Initialize hot_days as a logical vector of the same size as temperatures. Then use a for loop from 1 to the length of temperatures.

4

Plot temperatures and highlight hot days

Plot the temperatures vector with days on the x-axis and temperatures on the y-axis. Then highlight the hot days on the plot with red circles using the logical vector hot_days

MATLAB

temperatures = [22, 25, 27, 30, 28, 26, 24];
hot_threshold = 27;
hot_days = false(size(temperatures));
for i = 1:length(temperatures)
    hot_days(i) = temperatures(i) > hot_threshold;
end
% Your code here

Need a hint?

Use plot to draw the temperature line and then plot red circles on hot days using logical indexing.