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mengzi33

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[求助] Matlab求函数留数

以下是Matlab求函数H在极点处的留数,结果为0,不知道哪里出错了,由于本人不是数学专业,所以特请教论坛大神~
syms Beta Gamma;
syms Alpha1 Alpha2;
syms bR aR kR;
syms k1 k2 k;
FBG=-(Beta^2+Gamma^2+Alpha2^2)^2+4*Alpha1*Alpha2*(Beta^2+Gamma^2)
%G=Gamma^2+bR*(Beta+kR*aR/bR)^2-kR^2/bR
Root_G=solve('Gamma^2+bR*(Beta+kR*aR/bR)^2=kR^2/bR','Gamma')
Alpha1=sqrt(Beta^2+Gamma^2-k1^2*(1-Beta/k)^2)
Alpha2=sqrt(Beta^2+Gamma^2-k2^2*(1-Beta/k)^2)
H=Alpha1/FBG
Res=limit(H*(Gamma-Root_G(1)),Gamma,Root_G(1))
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