How to make a vector whose size can vary ?

Question

charu shree 2023-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/1954449-how-to-make-a-vector-whose-size-can-vary

移动：Matt J 2023-4-29

Hello all , In the algorithm on which I am working, I need to have a vector whose size can vary in the for loop.

For e.g., In the below code I want to have bu_length to change to new dimension in each slot.

But the problem I am facing is that the new buffer length (bu_length_new) is still same as old buffer length (bu_length_old), only its contents are changed depending on "binornd".

Any help in this regard will be highly appreciated.

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 = qu_length(:,i)+ binornd(100,0.2);
    end
end

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Answer 1

Suraj 2023-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/1954449-how-to-make-a-vector-whose-size-can-vary#answer_1225589

移动：Matt J 2023-4-29

在 MATLAB Online 中打开

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.