How can I get a bode magnitude to be a certain size vector?

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jrz 2022-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/1811365-how-can-i-get-a-bode-magnitude-to-be-a-certain-size-vector

评论： Star Strider 2022-9-25

I've generated a transfer function, from which I need the magnitude as a vector to perform some integration on. The magnitude needs to be multiplied by a PSD (power spectral density) and then integrated using trapz(). The issue is that the PSD and magnitude vectors are different lengths, so trapz doesnt work. Is there a way I can specify the size of the magnitude vector so that is its a 1x10000 column vector? Below is my transfer function and how I have extracted the magnitude vector.

tf =

0.0001121 s^3 - 0.000292 s^2 - 0.0002738 s - 1.711e-05

------------------------------------------------------

s^4 + 5.701 s^3 + 20.31 s^2 + 0.6124 s + 0.3877

% Continuous-time transfer function.

[mag phase] = bode(tf)

MAG = sqeeze(mag)

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Answer 1

Star Strider 2022-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/1811365-how-can-i-get-a-bode-magnitude-to-be-a-certain-size-vector#answer_1059945

The bode function allows you to specify a vector of frequencies in radians/time_unit.. See the documentation section on Bode Plot at Specified Frequencies and w for details. That way, you can control the size of the output.