How do I zoom in on a certain section of a magnitude bode plot

Question

matthew henderson 2022-9-28

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https://ww2.mathworks.cn/matlabcentral/answers/1813615-how-do-i-zoom-in-on-a-certain-section-of-a-magnitude-bode-plot

评论： KSSV 2022-9-28

I have used the bode(g),grid function to plot a magnitude and phase plot from my transfer function, I now wish to zoom in on a specific section of the magnitude plot. Is this possile and if so how do I go about doing it?

Here is my code:

num = [1];

den = [1 0.04946 3.00316 0.0989847 3.00322 0.0494631 1.00006];

g=tf(num, den)

bode(g),grid

Here is an image of my plot< i would like to zoom in of the peak of the magnitude plot of my bandpass filters transfer function.

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KSSV 2022-9-28

Use axis with your required limits.

KSSV 2022-9-28

num = [1];

den = [1 0.04946 3.00316 0.0989847 3.00322 0.0494631 1.00006];

g=tf(num, den)

g = 1 ----------------------------------------------------------------------- s^6 + 0.04946 s^5 + 3.003 s^4 + 0.09898 s^3 + 3.003 s^2 + 0.04946 s + 1 Continuous-time transfer function.

bode(g),grid

xlim([0.8 1.2])

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Answer 1

Chunru 2022-9-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1813615-how-do-i-zoom-in-on-a-certain-section-of-a-magnitude-bode-plot#answer_1062260

num = [1];

den = [1 0.04946 3.00316 0.0989847 3.00322 0.0494631 1.00006];

g=tf(num, den)

g = 1 ----------------------------------------------------------------------- s^6 + 0.04946 s^5 + 3.003 s^4 + 0.09898 s^3 + 3.003 s^2 + 0.04946 s + 1 Continuous-time transfer function.

bode(g)

grid on

ax = findobj(gcf, "Type", "Axes");

set(ax, "XLim", [0.8 1.2])