how can I plot bode plot and phase magnitude plot of this code?

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nelson 2017-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/348323-how-can-i-plot-bode-plot-and-phase-magnitude-plot-of-this-code

评论： Michael Dombrowski 2017-7-12

close all; clear all; clc; w=[.001 .0036 .0126 .0464 .1668 .5995 2.1544 7.7426 27.8256 100 200]; for k=1:0.5:10; for a=1:0.5:5; num=k; den=[1 a 0]; sys=tf(num,den); end end for k0=1:1:171 figure(k0) [magk0,pha2k0,w]= bode(sysk0,w); end for k1 = 1:171 figure(k1) subplot(2,1,1) plot(w,20*log10(Magnitude(k1,:))) title('Magnitude (dB)') grid subplot(2,1,2) plot(w,Phase(k1,:)) title('Phase (°)') grid end

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Michael Dombrowski 2017-7-12

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What you need is a simple bode plot.

you can simply use:

w=[.001 .0036 .0126 .0464 .1668 .5995 2.1544 7.7426 27.8256 100 200]; 
for k=1:0.5:10
  for a=1:0.5:5
      num=k; 
      den=[1 a 0]; 
      sys=tf(num,den); 
  end 
end
bode(sys,w);
grid on