How to plot magnitude (not in db) of the transfer function for the frequencies?

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Waqar Ahmed 2020-3-1

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编辑： Joel 2023-3-29

Normally we use bode plot for the magnitude of transfer function tf. But, how to get absolute magnitude in matlab.

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Answer 1

Joel 2023-3-29

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编辑：Joel 2023-3-29

在 MATLAB Online 中打开

Hi,

You can use 'bode' function itself to get the absolute magnitude in MATLAB.

[mag,phase,wout] = bode(sys); % where 'sys' is the transfer function specified using 'tf'

‘mag’ is the absolute magnitude (not in dB) and ‘wout’ is a set of frequencies. You can now plot ‘mag’ against ‘wout’ by either using the 'plot' function if you want a linear X axis or the 'semilogx' function if you want a logarithmic X axis.

Refer to the following documentation for more information:

Bode plot of frequency response, or magnitude and phase data - MATLAB bode - MathWorks India

2-D line plot - MATLAB plot - MathWorks India

Semilog plot (x-axis has log scale) - MATLAB semilogx - MathWorks India

Hope this helps!