Array performance in class attributs

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Franck AUBINEAU
Franck AUBINEAU 2024-2-5
评论： Franck AUBINEAU 2024-2-5
Here is an (short) example of the observed problem. It is not the exact code but it is the exact problem :-)
% Class
classdef MaClasse < handle
properties (Access = public)
tabVal = [];
end
end
% Code, declaration, allocation
pTest = MaClasse();
pTest.tabVal = zeros(200,1000);
tmp = zeros(200,1000);
% Problem
pTest.tabVal(10,:) = ones(1,1000); %
tmp(10,:) = ones(1,1000); % -> twice even more faster than the line above

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Shivam
Shivam 2024-2-5
Hi Franck,
Based on the code you have shared, it seems you want to know the discrepancy in execution time between assigning a matrix of ones to a property of a custom class object and assigning it directly to a standard array.
It is important to know that the observed difference in performance comes from MATLAB's additional processing when dealing with class properties. Whenever you alter a property of a handle class, MATLAB has to conduct extra operations, including managing object references and maintaining the integrity and encapsulation of the data.
And, with a conventional matrix such as tmp, MATLAB can interact with and alter the memory directly, bypassing the complexities introduced by object-oriented features.
I hope it helps in understanding the performance difference between the two lines.
Thanks
  1 个评论
Franck AUBINEAU
Franck AUBINEAU 2024-2-5
Hi and thanks for this answer.
It's exactly what I think but I'm very disapointed by such a difference. I'm using Matlab class in my simulation code and it seems that performance (this example and others like access time in handle cell array) are very slow.

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