153 views (last 30 days)

Hye i really confuse on how much method to write the code to plot magnitude and phase. Below is my function.

X(z)=z / (z-1)^2

Any idea how to start beside plot?

Star Strider
on 16 Jun 2020

Try this:

z = tf('z');

X = z / (z-1)^2;

bode(X)

.

Star Strider
on 16 Jun 2020

I have no idea what you are doing, and I cannot run your code. I cannot imagine how you get a transfer function straight out of a decimated signal, or what ‘calculate the spectrum of the decimated signal using Z-transform technique’ refers to.

If you are estimating a transfer function from the input to and output of a discrete (sampled) system in either the time-domain or frequency-domain, you can either use the System Identification Toolbox functions (there are several that could apply), or the Signal Processing Toolbox invfreqz function. You will need to experiment with whatever functions you choose to use to get the result you want.

.

Deepak Gupta
on 16 Jun 2020

Star Strider has given the answer but just FYI:

X = tf([1 0], [1 -2 1]);

bode(X), grid

This will work too.

You can know more about bode plots here:

Deepak Gupta
on 16 Jun 2020

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!
## 0 Comments

Sign in to comment.