Can MATLAB pass by reference?
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How does MATLAB deal with this?
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Doug Hull
2011년 1월 18일
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Bill Tubbs
2021년 10월 22일
Both the links in the answer seem to be broken now. Does anybody have updated URLs?
Is this one of them perhaps:
Yorgos Tsitsikas
2023년 9월 15일
추가 답변 (4개)
Marco
2012년 7월 18일
Is this also true for nested function calls? Cuz it seems like it only works for direct function calls. In my GUIDE gui I have a function (call it Fn_takesHandles) that takes in the figure handles and updates the axes, when called by callback functions directly works just as intended. However, I run into problems when the stack frame is not one-to-one. A callBack function calls a helper function called Auto which in turn calls Fn_takesHandles. In this case it does not work as intended. Any changes made to the figure handles by Fn_takesHandles is not persistent. How would you go about solving this problem?
Is there any way to declare pointers in matlab? Any help would be appreciated!!
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Walter Roberson
2012년 7월 19일
편집: Walter Roberson
2018년 9월 14일
There is no way to declare pointers in MATLAB (at least not for calling MATLAB functions; there are ways to copy around pointers that have been created at the C / C++ level.)
Jason Climer
2017년 6월 20일
Is this determined during the JIT compilation or as needed, i.e., is the copy of x made upon the function call or when the program executes
x(2) = 2;
?
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Walter Roberson
2017년 6월 20일
It is generally determined when the program executes, as it is not always possible to tell ahead of time whether a value is shared or not. Especially when you consider the hidden effect of assignin() .
Also, overloading can happen at run-time: the current directory or path of an operation at the time a routine is first JIT'd is not necessarily going to be the same as during a later operation.
There are cases where MATLAB does enough analysis to establish that "update in place" can happen; I do not know enough about the mechanics of that to say how it is done taking into account overloading.
Mandeguz
2017년 6월 22일
How about when writing MEXs? Can one pass by reference within the computational routine and pull those values back to the main MATLAB code that called the MEX?
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James Tursa
2018년 9월 14일
Also note that as of R2015b, MATLAB passes arguments to mex routines as shared data copies (it used to pass them by reference).
James Tursa
2019년 1월 10일
And as of R2018a, complex variable arguments to mex routines essentially get deep data copied in both directions if you use the -R2017a compilation model.
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