Plot Mag[H(j2pif)] as a function of frequency over the range of 0 to 4 KHz

I'm not sure how to do this. The next part of the question asks for the 3-dB cutoff frequency of the filter, so I'm guessing I need the Bode plot? Can anyone help with this? I've initialized H = tf(b,a) because a and b are defined as matricies earlier in the script. Then I said bode(H), but I'm not sure how to include the j2pif bit.

thanks

Answer 1

[@Johannes]

Hello,

you can use the command "bode(H,{wmin,wmax})" where wmin (=2pifmin) and wmax are your boundaries to plot the diagram over your desired borders. To learn more aboute bode: http://www.mathworks.com/help/control/ref/bode.html

Regrads, John