matlab问题求救 In an assignment A(I) = B,the number of elements

matlab问题求救 In an assignment A(I) = B,the number of elements in B and I must be the same.A=[10,-1,0;-1,10,-2;0,-2,10];b=[9,7,6];x(1)=[0,0,0];r=10^(-6);omiga=0.8;N=1000;x=x(1);for k=1:Nx(i)=omiga*(b(i)-A(i,:)*x)/A(i,i)+x(i);if norm(x-x(1))