Spectral Analysis Techniques Course _ Issue plotting a window created with Window Designer in MATLAB

Hi everyone,

I'm working on the "Spectral Analysis Techniques" course on MathWorks, and I'm stuck on Task 1 of the "Create and Apply Windows" activity.

I followed the instructions to create a rectangular window using Window Designer, set the length to 2400, and saved it with the name w.

Now, the task says:

"Enter the command for plotting the window created in task 1. Plot w versus t."

I tried the following command:

plot(w, t)

But I got an error, and the course marks it as incorrect. I also tried:

plot(0:length(w)-1, w)

But that didn’t work either in the course platform.

It says:

❌ Is the x-axis data correct?

❌ Is the y-axis data correct?

Can anyone explain the correct way to plot the window in this case? I just want to display the rectangular window correctly in the time domain.

Thanks in advance for your help!

Answer 1

[Cris LaPierre]

There seems to be a bug with this task. Please report this directly to MathWorks here: https://www.mathworks.com/support/contact_us.html

You need to make some changes to the script in order to pass.

1. w should be defined by Window Designer, not the code. Delete this line of code in the Task 1 section: w=ones(n,1)
2. The assessment is looking at the wrong figure. Comment out the code in the Task 2 section: periodogram(sig,w,2^12,fs);