Assignment has more non-singleton rhs dimensions than non-singleton subscripts ERROR IN FOR LOOP

hi every one

I have written this code But the error is showen

clear,clc
N = 5;
A = eye(6);
B = zeros(6,3);
u = zeros(3,N)
x = zeros(6,N); x(:,1)=[1;1;1;1;1;1];

for i=1:N
    x(:,i+1)=x(:,i)+A*x(:,i)+B*u(i);
end

Assignment has more non-singleton rhs dimensions than non-singleton subscripts

Answer 1

[James Tursa]

x(:,i+1)=x(:,i)+A*x(:,i)+B*u(:,i); % changed u(i) to u(:,i)

[john white]

thank you so much