MATLAB Answers

How to plot Amplitude Spectrum of CT and DT System Response

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Wali Ullah
Wali Ullah on 25 Nov 2020
Answered: Shraddha Jain on 16 Dec 2020
I want to plot this function in MatLab, but it either doesn't plot (session just crashes after a few minutes), or it says that imaginay/complex numbers can't be plotted.
Can anyone help me with the syntax/commands for these functions?
I'm fairly new to matlab so I don't know how to plot this. Here are the pictures of 2 functions (CT and DT):
The plots are supposed to look like this:

Answers (1)

Shraddha Jain
Shraddha Jain on 16 Dec 2020
Hi Wali,
I understand that you want to plot the amplitude of the continuous-time frequency response and discrete-time frequency response . This can be done in MATLAB using the abs function as,
plot(w,abs(Y_jw)) % Continuous-time Frequency Response
plot(v,abs(Y_ejv)) % Discrete-time Frequency Response
It is not possible to plot complex numbers by directly providing them as arguments in the plot function as of now.

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