Block parameters configuration in Simulink - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the gain value of a Gain block in Simulink.

Simulink

set_param('model/Gain', 'Gain', '[1]');

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

A'5'

B'GainValue'

C'BlockName'

D'Input'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the block name instead of the gain value.

Not using quotes around the gain value.

The 'Gain' parameter expects a string representing the gain value, such as '5'.

2fill in blank

medium

Complete the code to get the value of the 'SampleTime' parameter from a block.

Simulink

sampleTime = get_param('model/Integrator', '[1]');

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

A'BlockType'

B'InputSignal'

C'SampleTime'

D'Gain'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Gain' instead of 'SampleTime'.

Using incorrect parameter names.

The 'SampleTime' parameter returns the sample time setting of the block.

3fill in blank

hard

Fix the error in the code to set the 'InitialCondition' parameter of a block.

Simulink

set_param('model/Memory', 'InitialCondition', [1]);

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

A0

B'0'

C'InitialCondition'

D'Memory'

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a numeric value without quotes.

Using the parameter name as the value.

The parameter value must be a string, so the number 0 should be in quotes.

4fill in blank

hard

Fill both blanks to create a dictionary of block parameters and their values.

Simulink

params = struct('[1]', '5', '[2]', '10');

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

AGain

BInitialCondition

CSampleTime

DBlockType

Attempts:

3 left

💡 Hint

Common Mistakes

Using block type names instead of parameter names.

Mixing parameter names with values.

The struct has keys 'Gain' and 'SampleTime' with their respective values.

5fill in blank

hard

Fill all three blanks to set multiple parameters of a block at once.

Simulink

set_param('model/Sum', '[1]', '+-', '[2]', 'on', '[3]', 'off');

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

AInputs

BShowName

CLock

DSampleTime

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect parameter names.

Mixing parameter values and names.

The parameters 'Inputs', 'ShowName', and 'Lock' are set with their respective values.

Practice

1. What is the main purpose of configuring block parameters in Simulink?

easy

A. To export the block to another model

B. To control how each block behaves during simulation

C. To rename the block automatically

D. To change the color of the block icon

Solution

1. Step 1: Understand block parameters

   Block parameters define the behavior and settings of a block in Simulink.

2. Step 2: Identify the purpose

   Changing parameters affects simulation results, not appearance or export.

3. Final Answer:

   To control how each block behaves during simulation -> Option B

4. Quick Check:

   Block parameters = behavior control [OK]

Hint: Block parameters set behavior, not appearance [OK]

Common Mistakes:

• Confusing parameters with block appearance
• Thinking parameters rename blocks automatically
• Assuming parameters export blocks

2. Which of the following is the correct syntax to set a block parameter named Gain to 5 using set_param?

easy

A. set_param(model/block, 'Gain', 5)

B. set_param('model/block', 'gain', '5')

C. set_param('model/block', Gain, '5')

D. set_param('model/block', 'Gain', '5')

Solution

1. Step 1: Check parameter name and value type

   Parameter names are strings; values must be strings for set_param.

2. Step 2: Validate syntax

   Correct syntax uses quotes around parameter name and value: 'Gain', '5'.

3. Final Answer:

   set_param('model/block', 'Gain', '5') -> Option D

4. Quick Check:

   Parameter and value as strings = correct [OK]

Hint: Always quote parameter names and values in set_param [OK]

Common Mistakes:

• Passing numeric value without quotes
• Using wrong case in parameter name
• Omitting quotes around parameter name

3. Given the code snippet:

set_param('myModel/GainBlock', 'Gain', '10');
value = get_param('myModel/GainBlock', 'Gain');

What will be the value of value after execution?

medium

A. 10

B. Gain

C. '10'

D. Error

Solution

1. Step 1: Understand set_param effect

   set_param sets the 'Gain' parameter to string '10'.

2. Step 2: Understand get_param return type

   get_param returns parameter values as strings, so value is "10" (string without quotes in output).

3. Final Answer:

   "10" -> Option A

4. Quick Check:

   get_param returns string value [OK]

Hint: get_param returns parameter values as strings [OK]

Common Mistakes:

• Assuming get_param returns numeric value
• Confusing parameter name with value
• Expecting error from correct syntax

4. Consider this code:

set_param('model/Integrator', 'InitialCondition', 0);

What is the error in this code?

medium

A. Value 0 should be a string '0'

B. Parameter name 'InitialCondition' is incorrect

C. No error

D. Block path 'model/Integrator' is invalid

Solution

1. Step 1: Check parameter value type

   set_param accepts numeric values for InitialCondition; 0 is converted to '0'.

2. Step 2: Confirm parameter name and block path

   'InitialCondition' is valid; block path assumed correct.

3. Final Answer:

   No error -> Option C

4. Quick Check:

   set_param handles numeric values [OK]

Hint: set_param accepts numeric values directly [OK]

Common Mistakes:

• Assuming value must be quoted string
• Thinking parameter name is wrong
• Believing block path is invalid

5. You want to programmatically change the 'Gain' parameter of multiple Gain blocks in a model named controlModel. Which approach correctly updates all Gain blocks to value 3.5?

hard

A. Use find_system to get all Gain blocks, then loop with set_param setting 'Gain' to '3.5'

B. Manually open each block and set 'Gain' to 3.5 in the GUI

C. Use set_param('controlModel', 'Gain', '3.5') to set all blocks at once

D. Rename all Gain blocks to '3.5' using set_param

Solution

1. Step 1: Identify all Gain blocks

   Use find_system('controlModel', 'BlockType', 'Gain') to get all Gain blocks.

2. Step 2: Loop through blocks and set parameter

   For each block, use set_param(block, 'Gain', '3.5') to update the parameter.

3. Final Answer:

   Use find_system and loop with set_param to update all Gain blocks -> Option A

4. Quick Check:

   find_system + loop + set_param = bulk update [OK]

Hint: Use find_system to select blocks, then set_param in loop [OK]

Common Mistakes:

• Trying to set parameter on model instead of blocks
• Not quoting numeric values in set_param
• Renaming blocks instead of changing parameters