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

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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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Answer by Nicolas B. on 30 Oct 2019

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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).

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RAHUL KUMAR on 30 Oct 2019

i use structure but i have around 52 variables in my code

Nicolas B. on 30 Oct 2019

I don't see any way MATLAB could offer you better than structures or classes. But using classes requires to write their descriptions.

Walter Roberson on 30 Oct 2019

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?

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RAHUL KUMAR on 30 Oct 2019

yeah can you provide some example to better understanding

Steven Lord on 30 Oct 2019

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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