When I run my code, I keep getting this error: Unable to convert expression into double array."

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Pablo Álvarez García
回答： Benjamin Thompson 2022-2-14
clear all
close all
syms z w
Gz=z/(z-1);
Gjw=subs(Gz,z,exp(j*w));
figure(1)
subplot(2,1,1)
stem(real(Gjw))
xlabel('frec (Hz)')
ylabel('MÓDULO')
stem(imag(Gjw)) %grafica la parte imag
subplot(2,1,2)
xlabel('frec (Hz)')
ylabel('ARGUMENTO')
sgtitle('G(jw)')

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回答（1 个）

Benjamin Thompson
Benjamin Thompson 2022-2-14
You should use i for the imaginary number, instead of j. In your subs command you have not defined what w is.
>> Gjw
Gjw =
exp(w*1i)/(exp(w*1i) - 1)
>> Gjw=subs(Gz,z,exp(i*w));
>> Gjw=subs(w, 2);
>> stem(real(Gjw))
Now there should be no error

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