Creating a new model in Simulink - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new Simulink model named 'myModel'.

Simulink

model = [1]('myModel');

Drag options to blanks, or click blank then click option'

Aclose_system

Bnew_system

Csave_system

Dopen_system

Attempts:

3 left

💡 Hint

Common Mistakes

Using open_system instead of new_system

Using save_system before creating the model

The new_system function creates a new Simulink model with the specified name.

2fill in blank

medium

Complete the code to open the Simulink model named 'myModel'.

Simulink

[1]('myModel');

Drag options to blanks, or click blank then click option'

Aopen_system

Bsave_system

Cnew_system

Dclose_system

Attempts:

3 left

💡 Hint

Common Mistakes

Using new_system instead of open_system

Using close_system which closes a model

The open_system function opens an existing Simulink model for editing or simulation.

3fill in blank

hard

Fix the error in the code to save the Simulink model named 'myModel'.

Simulink

save_system([1]);

Drag options to blanks, or click blank then click option'

AmyModel

B'myModel.slx'

CmyModel.slx

D'myModel'

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the model name without quotes

Passing the filename with extension without quotes

The save_system function requires the model name as a string, so it must be in quotes.

4fill in blank

hard

Fill both blanks to add a Gain block to the model and set its gain value to 5.

Simulink

add_block('simulink/Commonly Used Blocks/Gain', '[1]/Gain');
set_param('[2]/Gain', 'Gain', '5');

Drag options to blanks, or click blank then click option'

AmyModel

BGainBlock

Cmodel

DGain

Attempts:

3 left

💡 Hint

Common Mistakes

Using block names instead of model name in the path

Using variable names that are not defined

Blocks are added to the model by specifying the model name and block path. Both blanks require the model name string.

5fill in blank

hard

Fill all three blanks to connect the Gain block output to a Scope block input in the model.

Simulink

add_block('simulink/Commonly Used Blocks/Scope', '[1]/Scope');
add_line('[2]', 'Gain/1', '[3]/1');

Drag options to blanks, or click blank then click option'

AmyModel

CScope

DGain

Attempts:

3 left

💡 Hint

Common Mistakes

Using block names instead of model name in add_line

Mixing block names and model names in paths

The blocks and lines are added to the model named 'myModel'. The line connects output port 1 of Gain to input port 1 of Scope.

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