How to plot magnitude and phase spectrum of the function?

Question

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?

Neeta Dsouza · Accepted Answer

Try This :
 

 
z = tf('z');
X = z / (z-1)^2;

bode(X)

How to plot magnitude and phase spectrum of the function?

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