Re: Bandwidth of transfer function

[Doug Stewart]

On Sun, Mar 25, 2018 at 11:54 AM, Θύμιος Γρίβας <address@hidden> wrote:

Hello there,

I want to calculate the bandwidth of a transfer function but i have a problem.

this is my code:

pkg load control

A=tf(20,[1 2 30]);

bandwidth(A)

Of course A is not a matrix and this is a problem.

How can i calculate the bandwidth? I can not find any solution in the internet.

Thank you in advance,

Grivas Efthimios

The bandwidth that you are seeing is from the linear math matrix section.

For a control signal bandwidth: here is a quick rendition.

save this as lpbandwidth.m

 A=tf(20,[1 2 30]);

 bode(A)

 dcgain1=dcgain(A)

 [ mag,p,w]=bode(A);

 q=find(mag<dcgain1/2);

 index1=q(1);

 gain2=mag(index1)

 bw=w(index1)

 st1=mat2str(bw,6)

 disp(["the bandwidth of this lowpass filter is " st1 " radians per second"])

I will work on making a bandwidth function in the control tool box.

--

DAS