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

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

Answer 1

[Joel]

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!