How can I store 3 values of a sequence and iterate?

Input = [1,2,3,4,5,6,7,8,9,10,11,12];

Buffer= zeros(min(4,10000),1);
first = 1;
last = 4;
Buff_size = 3;
step = 1;

keeplooking = true;
while keeplooking == true %infinite loop
%     Buffer= zeros(min(4,10000),1);
    Buffer(1:4)= Input(first:last);
    start = step + last;
    last = start + Buff_size; 
end

Why I am not able to continue the while loop?

I have the following error: In an assignment A(:) = B, the number of elements in A and B must be the same.

when Buffer(1:4)= Input(first:last); are from the same size....

[darova]

[Mariana]

Cant believe that I miss that. Thanks

[Mariana]

Why if I try to do the same method in simulink it doesnt works?

[darova]

I don't know how to use Simulink