Change of scale in Bode Magnitude Plot

Is it possible to have the Bode Magnitude plot in Log10 scale instead of decibels? If so, what is the procedure?

Thank you very much

S Cunha

Answer 1

[Shreeya]

Hi

I understand you want to plot the bode magnitude plot in log10 scale.

You can follow the following steps for it:

• Obtain the bode magnitude values using the "bode" function.
• Convert the values to log scale using the "log10" function
• Plot the obtained values in log10 base against frequency.

I'm attaching an example code and documetation links for the functions used below

https://in.mathworks.com/help/ident/ref/dynamicsystem.bode.html

H=tf([1],[1,1]);                                       % sample transfer function
[mag,phase,wout] = bode(H);                            % obtain magnitude response
magLog10 = log10(mag);                                 % convert to log10 base
magLog10 = reshape(magLog10, [size(wout),1]);
plot(log10(wout), magLog10)