Unable to assign function handle to variable in specified workspace in app App Designer

Question

balandong 2020-3-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/509333-unable-to-assign-function-handle-to-variable-in-specified-workspace-in-app-app-designer

评论： balandong 2020-3-6

Hi, the issue is about Carrying over variables in app-designer to another function.

The idea is to call (STEP ONE) a figure that designed in app designer from an external function (i,e,TestFunc). The Figure equip with a push button . A new routine is execute whenever the push button is press (STEP TWO). For simplicity, the new routine responsible to assign (STEP THREE) the myVar with a value of 5. Ultimately, I want to assigns (STEP FOUR) the function handle myVar into the workspace of TestFunc using the assign in command. Once succesfully carrying the variable into the caller workspace, the fig will be deleted (STEP FIVE). Then, the NewVar will be assigned (STEP SIX) to equal to NewVar, at the TestFunc environment.

To achieve the following objective, the syntax for the TestFunc and fig of the app designer are;

Syntax of TestFunc

function  TestFunc()
%% STEP ONE
fig=app1; % app1 is the name of the figure designed with app designer. With the extension of mlapp
waitfor(fig)
%% STEP SIX
NewVar=myVar;
end

Syntax of fig of the app designer

        function ButtonPushed(app, event)
            %% STEO TWO
            %% Whenever, the pushbutton is pressed, go to this function %% 
            
            %% STEP THREE
            myVar = 5;
            %% STEP FOUR
            assignin('caller','myVarX',myVar)
            %% STEP FIVE
            delete(app)
            
        end %% POINTER ONE

However, MATLAB give the following error;

Unrecognized function or variable 'myVar'.
Error in newt (line 5)
NewVar=myVar;

Upon debugging, I notice myVar has been succesfully transfer to the caller environment just before STEP FIVE. But, at the exit of the ButtonPushed function (POINTER ONE), the myVar at caller environment was cleared.

Appreciate if someone can shed some light to address this problem.