Type conversion functions in MATLAB - Mini Project: Build & Apply

Type Conversion Functions in MATLAB

📖 Scenario: You are working with sensor data that comes as text strings. To analyze the data, you need to convert these text strings into numbers.

🎯 Goal: Learn how to convert text strings to numbers and numbers to text strings using MATLAB's type conversion functions.

📋 What You'll Learn

Create a cell array of text strings representing numbers

Create a variable to hold the number of elements

Convert the cell array of strings to a numeric array

Convert the numeric array back to a cell array of strings

Display the final converted cell array of strings

💡 Why This Matters

🌍 Real World

Sensors and devices often send data as text. Converting text to numbers is essential for calculations and analysis.

💼 Career

Understanding type conversion is important for data cleaning, processing, and preparing data for machine learning or reporting.

1

Create a cell array of text strings

Create a cell array called sensorData with these exact string values: '12.5', '7.8', '15.3', '9.1'.

MATLAB

% Create a cell array called sensorData with the given string values
% Your code here

Need a hint?

Use curly braces {} to create a cell array of strings in MATLAB.

2

Create a variable for the number of elements

Create a variable called numElements and set it to the number of elements in sensorData using the length function.

MATLAB

sensorData = {'12.5', '7.8', '15.3', '9.1'};
% Create numElements to hold the number of elements in sensorData
% Your code here

Need a hint?

Use length(sensorData) to get the number of elements in the cell array.

3

Convert the cell array of strings to a numeric array

Create a numeric array called numericData by converting each string in sensorData to a number using the str2double function inside a for loop with index i from 1 to numElements.

MATLAB

sensorData = {'12.5', '7.8', '15.3', '9.1'};
numElements = length(sensorData);
% Convert sensorData strings to numericData array
% Your code here

Need a hint?

Use a for loop and str2double to convert each string to a number.

4

Convert numeric array back to cell array of strings and display

Create a cell array called convertedStrings by converting each number in numericData back to a string using the num2str function inside a for loop with index i from 1 to numElements. Then, display convertedStrings using disp.

MATLAB

sensorData = {'12.5', '7.8', '15.3', '9.1'};
numElements = length(sensorData);
numericData = zeros(1, numElements);
for i = 1:numElements
    numericData(i) = str2double(sensorData{i});
end
% Convert numericData back to strings and display
% Your code here

Need a hint?

Use num2str inside a for loop to convert numbers to strings, then use disp to show the result.