Matlab Program for 3 Variables simultaneous equations using Jacobi Iteration Method

a = input('Enter the Augmented Matrix >  ')
x(1)=0; y(1)=0; z(1)=0;
for i=2:100
    x(i)=( a(10) - a(4)*y(i-1) - a(7)*z(i-1) )/a(1);
    y(i)=( a(11) - a(2)*x(i-1) - a(8)*z(i-1) )/a(5);
    z(i)=( a(12) - a(3)*x(i-1) - a(6)*y(i-1) )/a(9);
    e1=abs(x(i)-x(i-1));
    e2=abs(y(i)-y(i-1));
    e3=abs(z(i)-z(i-1));
    if e1<=0.001 && e2<=0.001 && e3<=0.001
        Iteration=i
        x = x(i)
        y = y(i)
        z = z(i)
        break
    end
end