copy a handle of an Array

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Juan
Juan 2011-11-17
I want a method to copy a handle of an Array not the Array Elements. like the java Arrays. for Example: X = [3 3 3]; A = handle(X); so when I change A, X will Automatically changed. so: A(2) = 0; will case that x = 3 0 3

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Daniel Shub
Daniel Shub 2011-11-17
You cannot do it. While MATLAB supports handle classes, you cannot subclass double to be a handle class. There are a number of different ways to work around the problem, can you provide more about what you want to do?
If you are simply trying to avoid memory issues, MATLAB handles that behind the scenes and often there isn't a memory advantage between passing arrays, handles or pointers.
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Juan
Juan 2011-11-17
thanx..
i tried to refer to an double array
you said:"MATLAB handles that behind the scenes and often there isn't a memory advantage between passing arrays, handles or pointers."
when i try this every time:
manuel_selected = data.selectionArrays.manuel_selected;
because i want a short variable .. do MATLAB do what u say?
Daniel Shub
Daniel Shub 2011-11-17
Try it yourself. Watch a memory manager when you execute
a.x = randn(1e8, 1);
followed by
x = a.x;

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Walter Roberson
Walter Roberson 2011-11-17
Everything Daniel said is correct.
Perhaps for your purposes, you could make use of Matt J's file exchange contribution http://www.mathworks.com/matlabcentral/fileexchange/26611-on-the-fly-definition-of-custom-matrix-objects . and adapt it to your needs. You might end up needing to subclass it from the handle class to achieve your needs. I don't say that it will be easy, but if you really need it, you really need it.
Or perhaps the dataset array from the stats toolbox would meet your needs (we aren't clear yet as to what those needs are.)
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Juan
Juan 2011-11-17
thank you.. i 'll read that but it look to advanced for me

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