plot asymptote of transfer function in matlab in matlab

To plot the asymptotes of a transfer function in MATLAB, you need to first determine the poles and zeros of the transfer function.

You can use the pzmap() function to get the locations of the poles and zeros on the complex plane. Once you have the locations, you can draw asymptotes passing through the poles and zeros.

Here is an example code snippet to plot the asymptotes of a transfer function in MATLAB:

main.m
num = [1];   % numerator coefficients
den = [1, 2, 2];   % denominator coefficients

sys = tf(num, den);   % create transfer function

figure;
pzmap(sys);   % plot poles and zeros on the complex plane

poles = roots(den);   % find poles

hold on;
for i = 1:length(poles)
    real_part = real(poles(i));
    imag_part = imag(poles(i));
    plot([real_part real_part], ylim, '--r');   % plot vertical asymptote through pole
    plot(xlim, [imag_part imag_part], '--r');   % plot horizontal asymptote through pole
end
hold off;

title('Pole-Zero Plot with Asymptotes');
grid on;
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In this code, replace the num and den arrays with the coefficients of your transfer function. The example transfer function used here is (s + 1) / (s^2 + 2s + 2).

This code will plot the poles, zeros, and asymptotes of the given transfer function.