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why i am getting a blank graph

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Shahrukh s
Shahrukh s 2020-7-15
回答： Walter Roberson 2020-7-15
omega_bar = (0:0.01:5)';
n_omega_bar = size(omega_bar,1);
for i = 1:n_omega_bar
OMG = omega_bar(i,1);
Y_bar = (OMG.^2)/(1-OMG.^2)
end
figure(1)
plot(omega_bar,abs(Y_bar(1,:)),'o')
xlim([0 5])
ylim([0 8*1e14]);

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Walter Roberson
Walter Roberson 2020-7-15
Y_bar = (OMG.^2)/(1-OMG.^2)
That overwrites all of Y_bar each time. You need
Y_bar(1,i) = (OMG.^2)/(1-OMG.^2)
But your code could be simplified:
Y_bar = omega_bar.^2 ./ (1-omega_bar.^2);
No loop is needed.

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