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Warning: Imaginary parts of complex X and/or Y arguments ignored

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Abdulaziz
Abdulaziz 2012-7-16
Hi Everybody,
I want to plot gp vs. q in the following code:
kab=3;
kba=3;
gp=0.0:0.0001:1.25;
gn=0.0:0.0001:1.25;
DeltaB=8.296;
H=((i*gp./2)-(i*gn./2))./((DeltaB./2)-i*gn./2);
q=sqrt(((DeltaB./2).^2-kab*kba-(DeltaB./2).*(i*gp./2+i*gn./2)-gp.*gn./4)./(1-H.*1));
T=10*log10((abs(q.*1)).^2./(abs((q.*cosh(-q.*i))+((DeltaB./2-i*gn./2).*sinh(-q.*i)))).^2.);
plot(gp,q,'r')
grid on
q has real and imaginary part, but I got only the real part, and the code said:
Warning: Imaginary parts of complex X and/or Y arguments ignored
Any help please

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回答（2 个）

Wayne King
Wayne King 2012-7-17
What do you think you only have the real part?
kab=3;
kba=3;
gp=0.0:0.0001:1.25;
gn=0.0:0.0001:1.25;
DeltaB=8.296;
H=((i*gp./2)-(i*gn./2))./((DeltaB./2)-i*gn./2);
q=sqrt(((DeltaB./2).^2-kab*kba-(DeltaB./2).*(i*gp./2+i*gn./2)-gp.*gn./4)./(1-H.*1));
T=10*log10((abs(q.*1)).^2./(abs((q.*cosh(-q.*i))+((DeltaB./2-i*gn./2).*sinh(-q.*i)))).^2.);
plot(gp,real(q),'r')
You are using the unit imaginary, i, in both H and both q.
Walter Roberson
Walter Roberson 2012-8-10

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