MATLAB Answers


how to use passing by value and passing by reference

Asked by RAHUL KUMAR on 30 Oct 2019
Latest activity Commented on by Walter Roberson
on 30 Oct 2019
Basically i have many variables in my code , so i want to use in my function just passing by value and reference. Can anybody tell me with example.


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2 Answers

Answer by Nicolas B.
on 30 Oct 2019
 Accepted Answer

I highly recommend you to check the basic types of MATLAB. There is not such thing as a reference in MATLAB. However, for classes, you can create handle classes which works as reference. But then, you can give them by value. If you want to use that feature, read the Comparison of Handle and Value Classes.
Otherwise, if it is just to reduce the number of inputs of a function, you can use structures (or classes).


i use structure but i have around 52 variables in my code
I don't see any way MATLAB could offer you better than structures or classes. But using classes requires to write their descriptions.
If the issue is reducing the number of variables passed because passing that many variables is a nuisance, then consider using nested functions with shared variables.

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Answer by James Tursa
on 30 Oct 2019

In the background, MATLAB effectively passes all variables into functions as shared data copies. This has the same effect as passing by reference for variables that you don't modify inside the function, i.e. you don't get a deep data copy. Is this what you are asking about?


yeah can you provide some example to better understanding
Can you tell us a bit more information about how you've defined your function, how you're trying to call it, and the particular problem / pain / difficulty you're experiencing when trying to call it? With a bit more information we may be able to suggest an easier / faster / "better" solution for calling your function.

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