Pass by reference
in [Matlab]
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From: Divya on 5 May 2010 07:56 Hey I came across a problem in my matlab code MATLAB does not allow pass by reference. I have to pass a flag to one function. I have jus written a psudocode for my problem. Pls help me out Function gui1 flag=0; function pushbutton1 %this function is invoked when certain button1 gets pressed value of flag is supposed to get set to 1 when this function is invoked (PS: this is a call back function and gets invoked when the button is pressed) function run_button % here i will be invoking my image registration module. run_button function is also a call back function registration(param1,param2...... flag) The main problem here is passing by value. When the pushbutton1 is invoked the value of flag is changed. But that change is not reflected. Can you propose a work around solution?
From: Sean on 5 May 2010 08:18 "Divya " <divs.raghavan(a)gmail.com> wrote in message <hrrmco$ne6$1(a)fred.mathworks.com>... > Hey I came across a problem in my matlab code > > MATLAB does not allow pass by reference. I have to pass a flag to one function. > I have jus written a psudocode for my problem. Pls help me out > > Function gui1 > flag=0; > function pushbutton1 > %this function is invoked when certain button1 gets pressed > value of flag is supposed to get set to 1 when this > function is invoked (PS: this is a call back function and gets invoked > when the button is pressed) > > function run_button > % here i will be invoking my image registration module. > run_button function is also a call back function > registration(param1,param2...... flag) > > > > > > The main problem here is passing by value. When the pushbutton1 is > invoked the value of flag is changed. But that change is not > reflected. Can you propose a work around solution? I don't totally understand your problem but you might want to look at: >>setappdata(0,'flag',flag); and >>flag = getappdata(0,'flag');
From: Matt J on 5 May 2010 12:29 "Divya " <divs.raghavan(a)gmail.com> wrote in message <hrrmco$ne6$1(a)fred.mathworks.com>... > Hey I came across a problem in my matlab code > > MATLAB does not allow pass by reference. I have to pass a flag to one function. > I have jus written a psudocode for my problem. Pls help me out >[snip] > The main problem here is passing by value. When the pushbutton1 is > invoked the value of flag is changed. But that change is not > reflected. Can you propose a work around solution? ========== It's not really true that MATLAB disallows passing by reference. You should read the documentation on nested functions and externally-scoped variables. You might also read about handle objects in the object-oriented programming documentaion.
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