3 d array to 2d array

Hi All!

I am trying to fix this code

e = [0 1 0 1;1 0 1 1;0 1 0 1;1 1 1 0];
x = [0;0;0;0;0;0];
a1=2;
a2=4;
for t = 2:100
    x(:,2)=[1;2;3;4;5;6];
    for i=1:6
        for j=1:6
            u(i,j,t)=a1*e(i,j)*(x(j,t)-x(i,t))+a2*(x(i,t)-x(i,t-1));
        end
    end
    u=sum(u,2);
    u=permute(u,[1 3 2]);
end

I keep getting error warning like this "u(i,j,t) Index in position 2 exceeds array bounds (must not exceed 2)." I think the problem is in the initial x. what i want is when t = 1, x = [0;0;0;0;0;0]; and when t is 2 x=[1;2;3;4;5;6]; and the solution can give me u (i,t)

May anyone help me? thanks in advance!

[Mehmed Saad]

what about t= 3,4,5, ....