Creating a new model in Simulink - Quick Revision & Summary

Recall & Review

beginner

What is the first step to create a new model in Simulink?

Open Simulink and click on the 'New Model' button or select 'File > New > Model' to start a blank model canvas.

beginner

How do you add blocks to your new Simulink model?

Use the Simulink Library Browser to drag and drop blocks onto the model canvas.

beginner

What is the purpose of connecting blocks in a Simulink model?

Connecting blocks defines the flow of signals and data between components, representing the system behavior.

beginner

How can you save your new Simulink model?

Click 'File > Save As', then choose a file name and location to save the model as a '.slx' file.

beginner

What is the benefit of naming blocks and signals clearly in a Simulink model?

Clear names make the model easier to understand, debug, and maintain, especially when sharing with others.

What file extension does a saved Simulink model typically have?

A .slx

B .mdl

C .sim

D .mat

Modern Simulink models are saved with the '.slx' extension.

Which tool do you use to add blocks to a Simulink model?

A MATLAB Editor

B Command Window

C Simulink Library Browser

D Simulink Data Inspector

The Simulink Library Browser lets you browse and drag blocks into your model.

What does connecting blocks in Simulink represent?

A Model simulation speed

B File saving process

C Code generation

D Signal flow between components

Connections show how signals move between blocks, defining system behavior.

How do you start a new blank model in Simulink?

A Click 'New Model' button

B Open MATLAB Editor

C Run a script

D Open Simulink Data Inspector

The 'New Model' button opens a blank canvas for building your model.

Why is it important to name blocks clearly in a Simulink model?

A To reduce file size

B To improve model readability and maintenance

C To speed up simulation

D To enable automatic code generation

Clear names help you and others understand and maintain the model easily.

Describe the steps to create and save a new model in Simulink.

Think about starting from a blank canvas to a saved file.

Explain why connecting blocks is important in a Simulink model.

Consider how the model shows how parts work together.

Practice

1. What is the first step to create a new model in Simulink?

easy

A. Use new_system to create a new model.

B. Use simulink.open_system to open an existing model.

C. Add blocks directly without creating a model.

D. Save the model before creating it.

Solution

1. Step 1: Understand model creation functions

   The function new_system is used to create a new empty model in Simulink.

2. Step 2: Differentiate from opening models

   open_system opens existing models but does not create new ones.

3. Final Answer:

   Use new_system to create a new model. -> Option A

4. Quick Check:

   New model creation = new_system [OK]

Hint: Remember: new_system creates, open_system opens [OK]

Common Mistakes:

• Confusing new_system with open_system
• Trying to add blocks before creating a model
• Assuming saving creates a model

2. Which of the following is the correct syntax to create and open a new Simulink model named 'myModel'?

easy

A. simulink.create_system('myModel'); simulink.show_system('myModel');

B. simulink.open_system('myModel'); simulink.new_system('myModel');

C. new_system('myModel'); open_system('myModel');

D. simulink.new_system('myModel'); simulink.open_system('myModel');

Solution

1. Step 1: Identify correct function names

   The correct functions are new_system to create and open_system to open the model.

2. Step 2: Check function order and syntax

   Create the model first, then open it. new_system('myModel'); open_system('myModel'); follows this order and uses correct function names and syntax.

3. Final Answer:

   new_system('myModel'); open_system('myModel'); -> Option C

4. Quick Check:

   Create then open = new_system('myModel'); open_system('myModel'); [OK]

Hint: Create first, then open with correct function names [OK]

Common Mistakes:

• Using open_system before new_system
• Using incorrect function names like create_system
• Using incorrect 'simulink.' prefix

3. What will be the output of the following code snippet?

modelName = 'testModel';
new_system(modelName);
open_system(modelName);
blocks = find_system(modelName, 'Type', 'Block');
numBlocks = length(blocks);

What is the value of numBlocks right after running this code?

medium

A. 0

B. 1

C. An error occurs because the model is empty

D. Undefined variable error

Solution

1. Step 1: Understand model creation and block count

   After creating and opening a new model, it contains no blocks by default.

2. Step 2: Use find_system to count blocks

   find_system with 'Type'='Block' returns all blocks. Since none are added, the list is empty, so length is 0.

3. Final Answer:

   0 -> Option A

4. Quick Check:

   New model has zero blocks [OK]

Hint: New model starts empty, so block count is zero [OK]

Common Mistakes:

• Assuming default blocks exist
• Expecting an error for empty model
• Confusing blocks with system components

4. Consider this code snippet:

open_system('newModel');
new_system('newModel');

What is the main issue with this code when creating a new model?

medium

A. There is no issue; this code works fine.

B. The model is created twice, wasting memory.

C. The model name is invalid for Simulink.

D. The model is opened before it is created, causing an error.

Solution

1. Step 1: Analyze function order

   The code tries to open a model named 'newModel' before creating it, which causes an error because the model does not exist yet.

2. Step 2: Understand correct sequence

   The correct sequence is to create the model first with new_system, then open it.

3. Final Answer:

   The model is opened before it is created, causing an error. -> Option D

4. Quick Check:

   Open before create causes error [OK]

Hint: Always create before opening a model [OK]

Common Mistakes:

• Opening a model before creation
• Assuming open_system creates the model
• Ignoring error messages

5. You want to programmatically create a new Simulink model named 'controlSystem', add a Gain block, and open the model for editing. Which sequence of commands correctly achieves this?

hard

A. simulink.open_system('controlSystem'); add_block('simulink/Commonly Used Blocks/Gain', 'controlSystem/Gain1'); simulink.new_system('controlSystem');

B. new_system('controlSystem'); add_block('simulink/Commonly Used Blocks/Gain', 'controlSystem/Gain1'); open_system('controlSystem');

C. add_block('simulink/Commonly Used Blocks/Gain', 'controlSystem/Gain1'); simulink.new_system('controlSystem'); simulink.open_system('controlSystem');

D. simulink.new_system('controlSystem'); simulink.open_system('controlSystem'); add_block('simulink/Commonly Used Blocks/Gain', 'controlSystem/Gain1');

Solution

1. Step 1: Create the new model first

   Use new_system('controlSystem') to create the model before adding blocks.

2. Step 2: Add the Gain block to the model

   Use add_block with the correct source and destination path inside the new model.

3. Step 3: Open the model for editing

   Finally, open the model window with open_system('controlSystem') to see and edit it visually.

4. Final Answer:

   new_system('controlSystem'); add_block('simulink/Commonly Used Blocks/Gain', 'controlSystem/Gain1'); open_system('controlSystem'); -> Option B

5. Quick Check:

   Create, add block, then open model [OK]

Hint: Create model, add blocks, then open model [OK]

Common Mistakes:

• Adding blocks before creating the model
• Opening model before adding blocks
• Incorrect block path in add_block