A slight modification to the code will let you append a new column to bu_length_new with every iteration.
T = 20; % total slots
maxsize = 10; % maximum size of buffer
nodes = 8;
bu_length_old = zeros(maxsize,nodes); % This creates a buffer for each node and length is 10
n = 100; % number of packets
p = 0.2; % arrival rate of packets
for t = 1:T % each time slot
for i = 1:nodes
bu_length_new(:,i) = qu_length(:,i) + binornd(100,0.2);
end
end
bu_length_new is now a variable whose size varies. However, it is worth noting that vectors with variable sizes can cause significant overhead, and pre-allocating the variable is a good practice.
Hope this helps.
