View angle control in MATLAB - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of the view angle after this code?

Consider the following MATLAB code that sets the view angle of a 3D plot. What will be the azimuth and elevation angles after running this code?

MATLAB

figure;
plot3(1:10, rand(1,10), rand(1,10));
view(45, 30);
current_view = view;

A [45 30]

B [30 45]

C [0 90]

D [90 0]

💡 Hint

The view function in MATLAB takes azimuth first, then elevation.

The view function sets the azimuth and elevation angles in that order. So view(45,30) sets azimuth to 45 degrees and elevation to 30 degrees.

❓ Predict Output

intermediate

What happens if you call view with a single argument?

What is the effect of calling view(2) in MATLAB on a 3D plot?

MATLAB

figure;
plot3(1:10, rand(1,10), rand(1,10));
view(2);
current_view = view;

A [2 0]

B [0 90]

C [90 0]

D [45 30]

💡 Hint

Calling view with a single number sets a predefined view.

In MATLAB, view(2) sets the view to the top view of the XY plane, which corresponds to azimuth 0 and elevation 90.

❓ Predict Output

advanced

What is the output of this code changing view angles dynamically?

What will be the final azimuth and elevation angles after running this MATLAB code?

MATLAB

figure;
plot3(1:10, rand(1,10), rand(1,10));
for az = 0:45:180
    view(az, 45);
end
final_view = view;

A [0 45]

B [135 45]

C [45 45]

D [180 45]

💡 Hint

The loop sets the view multiple times, the last one is the final.

The loop increments azimuth from 0 to 180 in steps of 45, setting elevation to 45 each time. The final call is view(180,45).

❓ Predict Output

advanced

What error does this code raise?

What error will this MATLAB code produce?

MATLAB

figure;
plot3(1:10, rand(1,10), rand(1,10));
view('top');

A Error: Invalid input argument for view

B Error: Too many input arguments

C Error: Undefined function or variable 'top'

D No error, sets view to top

💡 Hint

The view function expects numeric inputs or specific strings like '2D' or '3D'.

The string 'top' is not a valid input for view in MATLAB, so it raises an invalid input argument error.

🧠 Conceptual

expert

How to programmatically rotate a 3D plot by 90 degrees around the vertical axis?

Which MATLAB code snippet correctly rotates an existing 3D plot by 90 degrees around the vertical (z) axis from its current view?

A view(0, 90);

B view(90, 0);

C

current_view = view;
view(current_view(1) + 90, current_view(2));

D view(current_view(1), current_view(2) + 90);

💡 Hint

Azimuth controls rotation around the vertical axis.

Adding 90 degrees to the azimuth angle rotates the plot 90 degrees around the vertical axis while keeping elevation unchanged.