??? Error: File: C:\Users\Administrator\Untitled9.m Line: 9 Column: 26 Missing MATLAB operat哪里错

for k=2:N
x(:,:,1);
x_(:,:,1)=[0.9;0];
i(k)=1-0.2*sin(k/20);
m=q*randn(n,1);
x(:,:,k)=A*x(:,:,k-1)+[-0.00028;0.00413*(1-exp(-0.002))]*i(k)+m;
x_(:,:,k)=A*x_(:,:,k-1)+[-0.00027;0.00413*(1-exp(-0.002))]*i(k);
f_(k)=3+13.433*x_(1,:,k).^2+284.23*x_(1,:,k).^3-453.64*x_(1,:,k).^4+355.88*x_(1,:,k).^5-108.97*x_(1,:,k).^6;
C(1,1,k)=f_(k)./x(1,:k);
C(1,2,k)=-1;
z(k)=C(:,:,k)*x(:,:,k)-0.00523*i(k)+r*randn;
z_(k)=C(:,:,k)*x(:,:,k)-0.00523;
P0=0.5*eye(n);
P(:,:,1)=P0;
P1(:,:,k)=A*P(:,:,k)*C(:,:,k);
P12(:,:,k)=P1(:,:,k)*C(:,:,k)`;
K(:,:,k)=P12(:,:,k)*inv(C(:,:,k)*P12(:,:,k)+R);
x_(:,:,k)=x_(:,:,k)+K(:,:,k)*(z(k)-(C(:,:,k)*x_(:,:,k)-0.00525*i(k)));
P(:,:,k)=P1(:,:,k)-K(:,:,k)*P12(:,:,k)`;
erro(:,k)=sprt(iag(P(:,:,k)));
if(x_(1,:,k)<0||x_(1,:,k)>1)
break
end
end

学会看报错
Error: File: C:\Users\Administrator\Untitled9.m Line: 9 Column: 26 Missing MATLAB operat
意思是第9行26列少了个运算符
C(1,1,k)=f_(k)./x(1,:k);

应该是
C(1,1,k)=f_(k)./x(1,:,k);

虽然我很聪明，但这么说真的难到我了