Standalone application creation in MATLAB - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

MATLAB Standalone Application: Output Behavior

Consider a MATLAB function compiled into a standalone application. The function reads an input number and returns its square. What will be the output if the input is 4?

MATLAB

function y = squareNumber(x)
    y = x^2;
end

A Error: Undefined function or variable 'x'

B 8

C 16

D 4

💡 Hint

Think about what squaring a number means.

The function squares the input number. For input 4, 4 squared is 16.

🧠 Conceptual

intermediate

MATLAB Compiler: Supported File Types

Which of the following file types can be compiled into a standalone MATLAB application?

A .m files only

B .m and .mlx files

C .mlx files only

D .mat files

💡 Hint

Consider which files contain executable MATLAB code.

Only .m files (scripts/functions) can be compiled into standalone applications. .mlx files (live scripts) cannot be compiled directly.

🔧 Debug

advanced

Fixing Runtime Error in Standalone MATLAB App

A standalone MATLAB application throws this error when run: "Error using load: Unable to read file 'data.mat'." What is the most likely cause?

MATLAB

load('data.mat');
result = processData(data);

A The function processData is not defined.

B The file 'data.mat' is missing from the application folder.

C The load function is not supported in standalone apps.

D The variable 'data' is misspelled.

💡 Hint

Check if all required files are included with the app.

Standalone apps need all data files included or accessible; missing files cause load errors.

📝 Syntax

advanced

Correct MATLAB Compiler Command Syntax

Which command correctly compiles the MATLAB function 'myApp.m' into a standalone application named 'myAppExecutable'?

A mcc myApp.m -m -o myAppExecutable

B mcc -o myAppExecutable myApp.m -m

C mcc -m -o myAppExecutable myApp.m

D mcc -m myApp.m -o myAppExecutable

💡 Hint

The order of options matters in the mcc command.

The correct syntax is 'mcc -m sourcefile -o outputname'.

🚀 Application

expert

Standalone MATLAB App: Handling User Input

In a standalone MATLAB application, which method is best to get user input from the command line?

A Use the input() function to prompt the user.

B Use GUI dialog boxes like uigetfile().

C Read input from a file only.

D Use disp() to display and pause() to wait.

💡 Hint

Think about command line interaction.

The input() function works in standalone apps to get user input from the command line.

Practice

1. What is the main purpose of creating a standalone application in MATLAB?

easy

A. To run MATLAB programs without requiring MATLAB installed

B. To write scripts faster in MATLAB editor

C. To debug MATLAB code more easily

D. To convert MATLAB code into Python code

Solution

1. Step 1: Understand standalone application purpose

   Standalone apps allow running MATLAB programs on computers without MATLAB installed.

2. Step 2: Compare options

   Only To run MATLAB programs without requiring MATLAB installed correctly describes this purpose; others describe unrelated tasks.

3. Final Answer:

   To run MATLAB programs without requiring MATLAB installed -> Option A

4. Quick Check:

   Standalone apps = run without MATLAB [OK]

Hint: Standalone apps run without MATLAB installed [OK]

Common Mistakes:

• Confusing standalone apps with script editing
• Thinking standalone apps convert code to other languages
• Assuming standalone apps help debugging

2. Which MATLAB command correctly compiles a script named myApp.m into a standalone application?

easy

A. buildApp myApp.m

B. compile myApp.m

C. run myApp.m -standalone

D. mcc -m myApp.m

Solution

1. Step 1: Recall MATLAB compile command

   The correct command to compile a standalone app is mcc -m filename.m.

2. Step 2: Match command to options

   Only mcc -m myApp.m matches this syntax exactly for myApp.m.

3. Final Answer:

   mcc -m myApp.m -> Option D

4. Quick Check:

   Compile command = mcc -m [OK]

Hint: Use 'mcc -m filename.m' to compile [OK]

Common Mistakes:

• Using 'compile' instead of 'mcc'
• Adding extra flags like '-standalone' incorrectly
• Using non-existent commands like 'buildApp'

3. What will happen if you try to run a MATLAB standalone app on a computer without MATLAB Runtime installed?

medium

A. The app will run normally without any issues

B. The app will automatically install MATLAB Runtime

C. The app will show an error about missing MATLAB Runtime

D. The app will convert itself to a script

Solution

1. Step 1: Understand MATLAB Runtime role

   MATLAB Runtime is required to run standalone apps on machines without MATLAB.

2. Step 2: Predict behavior without Runtime

   Without MATLAB Runtime, the app cannot run and shows an error about missing Runtime.

3. Final Answer:

   The app will show an error about missing MATLAB Runtime -> Option C

4. Quick Check:

   No Runtime = error shown [OK]

Hint: MATLAB Runtime must be installed to run apps [OK]

Common Mistakes:

• Assuming app runs without Runtime
• Thinking app auto-installs Runtime
• Believing app converts to script automatically

4. You tried to compile app.m using mcc -m app.m but got an error saying 'Undefined function or variable'. What is the most likely cause?

medium

A. The script app.m calls functions not on the MATLAB path

B. You forgot to save app.m before compiling

C. The mcc command is misspelled

D. MATLAB Runtime is not installed

Solution

1. Step 1: Analyze error message

   'Undefined function or variable' means MATLAB cannot find a function or variable used in app.m.

2. Step 2: Identify common causes

   This usually happens if called functions are not on MATLAB path or missing.

3. Final Answer:

   The script app.m calls functions not on the MATLAB path -> Option A

4. Quick Check:

   Undefined function = missing path or file [OK]

Hint: Check all called functions are on MATLAB path [OK]

Common Mistakes:

• Assuming Runtime affects compilation
• Thinking misspelling 'mcc' causes this error
• Forgetting to save script usually causes different errors

5. You want to share a MATLAB app with users who do not have MATLAB. Which two steps must you do to ensure they can run it?

Choose the correct pair.

hard

A. Send the .m files and ask users to install MATLAB

B. Compile the app with mcc -m and instruct users to install MATLAB Runtime

C. Compile the app with mcc -m and users must have full MATLAB installed

D. Send the .m files and users run them in Octave

Solution

1. Step 1: Identify how to share MATLAB apps without MATLAB

   Standalone apps must be compiled with mcc -m to run without MATLAB.

2. Step 2: Understand user requirements

   Users need MATLAB Runtime installed to run compiled apps, not full MATLAB.

3. Final Answer:

   Compile the app with mcc -m and instruct users to install MATLAB Runtime -> Option B

4. Quick Check:

   Compile + Runtime = run without MATLAB [OK]

Hint: Compile app and require MATLAB Runtime for users [OK]

Common Mistakes:

• Thinking users need full MATLAB installed
• Sending only .m files without compiling
• Assuming Octave can run MATLAB standalone apps