matlab求解方程组 结果出现复数,【求解】matlab求解非齐次方程组，但是系数矩阵是复数，求帮忙...

matlab求解方程组 结果出现复数,【求解】matlab求解非齐次方程组，但是系数矩阵是复数，求帮忙...

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有人帮忙么。我贴出程序

k1=2;k2=3;k3=4;k4=5;k5=6;k6=7;

a=0.45;

x1=-6.5;x2=-5.5;x3=-4.5;x4=-3.5;x5=0;

S11=k1*cos(a)*x1;S12=k1*cos(a)*x2;S13=k1*cos(a)*x3;S14=k1*cos(a)*x4;

S21=k2*cos(a)*x1;S22=k2*cos(a)*x2;S23=k2*cos(a)*x3;S24=k2*cos(a)*x4;

S31=k3*cos(a)*x1;S32=k3*cos(a)*x2;S33=k3*cos(a)*x3;S34=k3*cos(a)*x4;

S41=k4*cos(a)*x1;S42=k4*cos(a)*x2;S43=k4*cos(a)*x3;S44=k4*cos(a)*x4;

S51=k5*cos(a)*x1;S52=k5*cos(a)*x2;S53=k5*cos(a)*x3;S54=k5*cos(a)*x4;

S61=k6*cos(a)*x1;S62=k6*cos(a)*x2;S63=k6*cos(a)*x3;S64=k6*cos(a)*x4;

y11=2;y12=3;y13=4;y14=5;

y21=2.1;y22=3.1;y23=4.1;y24=5.1;

y31=2.2;y32=3.2;y33=4.2;y34=5.2;

y41=2.3;y42=3.3;y43