Matlab does not plot the function

2021 1 16
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回答已采纳
更新时间：2021 1 17
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I'm trying to plot this function. There is no syntaxis mistakes, but the graphic appears empty. (It is a bode diagram).
GH_num= [1 2 3];
GH_den= [4 5 6 7 8];
GH_w=[];
for w=2*pi*logspace(-1,3,1000)
GH_num_w=polyval(GH_num,w*j);
GH_den_w=polyval(GH_den,w*j);
GH_w=[GH_w,GH_num_w/GH_den_w];
end
mag = 20*log10(abs(GH_w));
phase=rad2deg(angle(GH_w));
fGH=figure;
aGH=subplot(2,1,1,'Parent'fGH);
bGH=subplot(2,1,2,'Parent'fGH);
semilogx=(aGH,w/2/pi,mag)
semilogx=(bGH,w/2/pi,phase)

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 采纳的回答

Walter Roberson
Walter Roberson 2021-1-17
Ran in:

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Ran in:
GH_num= [1 2 3];
GH_den= [4 5 6 7 8];
GH_w=[];
wvals = 2*pi*logspace(-1,3,1000); %NEW
for w = wvals %CHANGED
GH_num_w=polyval(GH_num,w*j);
GH_den_w=polyval(GH_den,w*j);
GH_w=[GH_w,GH_num_w/GH_den_w];
end
mag = 20*log10(abs(GH_w));
phase=rad2deg(angle(GH_w));
fGH=figure;
aGH=subplot(2,1,1,'Parent',fGH); %FIXED
bGH=subplot(2,1,2,'Parent',fGH); %FIXED
semilogx(aGH,wvals/2/pi,mag) %FIXED
semilogx(bGH,wvals/2/pi,phase) %FIXED

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