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bode magnitude producing different plots for the same transfer function

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jrz 2022-9-25

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https://ww2.mathworks.cn/matlabcentral/answers/1811740-bode-magnitude-producing-different-plots-for-the-same-transfer-function

评论： Star Strider 2022-9-25

采纳的回答： Star Strider

I have transfer function and have manually extracted the magnitude and plotted it. When I used the bodemag function however, the plot looks very different. Im confused as to which one is correct and why they are coming out differently, as I havent applied any unit conversions. For my manual extraction, I have used the following and its produced the plot underneath.

[mag phase] = bode(tf);

Mag = transpose(squeeze(mag));

However, when I use the bodemag(tf) function, I get this:

I dont understand why these reuslts are so different or which one is correct and am looking for some claririfcation.

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Star Strider 2022-9-25

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The upper plot is plotted with a linear magnitude and the lower one is plotted with the magnitude in decibels.

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Paul 2022-9-25

Also, the upper plot x-axis is linear and the lower is log scale. And they don't cover the same max and min values.

Star Strider 2022-9-25

Noted. I didn’t catch the frequency axis difference. I was concentrating on the magnitude axis.

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