Scope and display blocks in MATLAB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to display the value of variable x.

MATLAB

x = 10;
disp([1]);

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

A'x'

B10

Cx

Ddisp

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the variable name displays the name, not the value.

Passing a number directly instead of the variable.

The disp function displays the value of the variable passed to it. Here, passing x shows its value.

2fill in blank

medium

Complete the code to create a scope block that shows the signal 'y'.

MATLAB

y = sin(0:0.1:1);
scope([1]);

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

Ay

Bx

Csin

D0:0.1:1

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the function name instead of the signal variable.

Passing the range vector instead of the signal.

The scope function displays the signal passed to it. Here, y is the signal to show.

3fill in blank

hard

Fix the error in the code to display the variable 'z' correctly.

MATLAB

z = 5;
disp([1]);

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

A'z'

Bz

C5

Ddisp(z)

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes displays the variable name, not its value.

Passing the number directly instead of the variable.

To display the value of z, pass the variable z without quotes to disp.

4fill in blank

hard

Fill both blanks to create a scope that displays the square of numbers from 1 to 5.

MATLAB

x = 1:5;
y = x[1]2;
scope([2]);

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

A.^

B*

Cx

Dy

Attempts:

3 left

💡 Hint

Common Mistakes

Using matrix multiplication operator * instead of element-wise power.

Passing the original vector x to scope instead of squared values.

The element-wise power operator .^ squares each element of x. The scope displays the squared values stored in y.

5fill in blank

hard

Fill all three blanks to create a display of the sum of two vectors a and b.

MATLAB

a = 1:3;
b = 4:6;
sumVec = a [1] b;
disp([2]);
scope([3]);

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

A+

BsumVec

Ca

Db

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication instead of addition.

Displaying or scoping the original vectors instead of the sum.

The plus operator + adds vectors a and b element-wise. The result sumVec is displayed and shown in the scope.

Practice

1. What is the main purpose of a Scope block in Simulink?

easy

A. To show numeric values in the workspace

B. To display signal graphs during simulation

C. To save simulation data to a file

D. To generate code from the model

Solution

1. Step 1: Understand the function of Scope blocks

   Scope blocks are used to visualize signals as graphs during simulation.

2. Step 2: Compare with other options

   Other options describe different functionalities not related to Scope blocks.

3. Final Answer:

   To display signal graphs during simulation -> Option B

4. Quick Check:

   Scope = signal graphs [OK]

Hint: Scope shows graphs, Display shows numbers [OK]

Common Mistakes:

• Confusing Scope with Display block
• Thinking Scope saves data
• Assuming Scope shows numeric values

2. Which of the following is the correct way to add a Display block in Simulink?

easy

A. Drag the Display block from the Simulink library to the model

B. Write display() in the MATLAB command window

C. Use the Scope block and rename it to Display

D. Add a To Workspace block and rename it Display

Solution

1. Step 1: Identify how to add blocks in Simulink

   Blocks are added by dragging them from the Simulink library browser into the model.

2. Step 2: Check other options

   Options A, B, and D describe incorrect or unrelated methods.

3. Final Answer:

   Drag the Display block from the Simulink library to the model -> Option A

4. Quick Check:

   Add blocks by dragging from library [OK]

Hint: Add blocks by dragging from library browser [OK]

Common Mistakes:

• Trying to add blocks via MATLAB commands
• Renaming blocks instead of adding correct ones
• Confusing Display with To Workspace block

3. Consider this Simulink model snippet: a sine wave connected to both a Scope and a Display block. What will you see during simulation?

medium

A. Both Scope and Display show numeric values

B. The Scope shows numeric values; the Display shows a graph

C. The Scope shows a graph of the sine wave; the Display shows the current numeric value

D. Neither block shows any output

Solution

1. Step 1: Understand Scope and Display outputs

   Scope shows signal graphs; Display shows current numeric values during simulation.

2. Step 2: Apply to sine wave input

   The sine wave signal will appear as a graph on Scope and as changing numbers on Display.

3. Final Answer:

   The Scope shows a graph of the sine wave; the Display shows the current numeric value -> Option C

4. Quick Check:

   Scope = graph, Display = number [OK]

Hint: Scope graphs signals; Display shows live numbers [OK]

Common Mistakes:

• Mixing up graph and numeric display
• Expecting Display to show full signal history
• Thinking Scope shows only numbers

4. You added a Scope block but it shows no signal during simulation. What is the most likely cause?

medium

A. The model has no input blocks

B. The Display block is missing

C. The simulation is paused

D. The Scope block is not connected to any signal

Solution

1. Step 1: Check Scope connection

   Scope must be connected to a signal line to display data.

2. Step 2: Consider other options

   Display block absence does not affect Scope; simulation paused would freeze output; no input blocks means no signals.

3. Final Answer:

   The Scope block is not connected to any signal -> Option D

4. Quick Check:

   Scope needs signal connection [OK]

Hint: Scope must connect to signal to show output [OK]

Common Mistakes:

• Assuming Display block affects Scope output
• Not checking signal connections
• Ignoring simulation state

5. You want to monitor multiple signals simultaneously during simulation and see both their graphs and numeric values updated live. Which combination of blocks should you use?

hard

A. Multiple Scope blocks and multiple Display blocks, each connected to one signal

B. One Scope block connected to all signals and one Display block connected to all signals

C. One Display block connected to all signals only

D. Multiple Display blocks connected to one signal each, no Scope blocks

Solution

1. Step 1: Understand monitoring multiple signals

   Each Scope or Display block connects to one signal to show its graph or numeric value.

2. Step 2: Evaluate options

   One Scope or Display cannot connect to multiple signals directly; multiple blocks are needed.

3. Final Answer:

   Multiple Scope blocks and multiple Display blocks, each connected to one signal -> Option A

4. Quick Check:

   One block per signal for graph and number [OK]

Hint: Use one block per signal to monitor multiple signals [OK]

Common Mistakes:

• Trying to connect one block to many signals
• Ignoring need for multiple displays
• Confusing Scope and Display capabilities