how to get z-transform expression along with the curve of this function

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Gaurav Sharma 2018-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/423590-how-to-get-z-transform-expression-along-with-the-curve-of-this-function

评论： Gaurav Sharma 2018-10-12

butterworth.m

I am getting the plot for this function. But i want to show the H(z) of this butterworth lowpass filter. Can You pls help me with this!

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Dimitris Kalogiros 2018-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/423590-how-to-get-z-transform-expression-along-with-the-curve-of-this-function#answer_341038

在 MATLAB Online 中打开

Try this:

clear; clc;
fc=500; %Hz;
fs=2000; %Hz;
n=4; % filter order
[b,a] = butter(n ,fc/(fs/2));
freqz(b,a);

You should get:

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Gaurav Sharma 2018-10-12

sorry man but it didnt work. But anyway, I figured it out: use filt(b,a) you will get the z trans. expression

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