App Designer: Using function outputs as variables within other functions

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Samuel Thompson 2017-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/372726-app-designer-using-function-outputs-as-variables-within-other-functions

评论： Mark Eigenraam 2022-4-13

I would like to store a variable as an output from a function in App Designer for use with other functions. Please see the simple example below.

properties (Access = private)
      x = linspace(0,1,10); % Description
  end
    methods (Access = private)
        function [y] = func(app)
            A = app.EditField.Value;
            B = A + 1;
            y = app.x.^2 + B;
            plot(app.UIAxes,app.x,y)                     
        end

I wish to use the variable 'y' from func(app) for use within the second function, func2(app).

        func2(app)
            plot(app.UIAxes2,app.x,y)
        end
    end

Any help would be appreciated, the example is trivial as both plots plot the same graph. I am just unaware of the syntax required as the App Designer environment has slight modifications from that of the usual MATLAB workspace.

Any help would be very appreciated,

Sam

(Using R2017b)

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采纳的回答

Chris Perkins 2017-12-15

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编辑：Chris Perkins 2017-12-15

在 MATLAB Online 中打开

Hi Sam,

The best way of storing data in one function in an AppDesigner app for use in another function is to create a new 'property', and set the property's value instead of creating a new local variable. Then, in your other functions, you have access to the app's properties and can use any property as needed.

The following documentation page describes this process in more detail, with examples:

https://www.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html

For example, create a new property 'y' in your 'properties'.

properties (Access = private)
    x = linspace(0,1,10); % Description
    y;  
end

Then, in func(app), set

app.y = app.x.^2 + B;

Then, in func2(app), you can have

plot(app.UIAxes2,app.x,app.y)

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Samuel Thompson 2017-12-18

Ah that's perfect, thanks for your help!

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Mark Eigenraam 2022-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/372726-app-designer-using-function-outputs-as-variables-within-other-functions#answer_939765

As a follow on, I had a similar problem. if I run the following a = myapp (pass_in_data), after the user has made changes to pass_in_data, how do i send the updated data back to the mlapp that called myapp. Thanks

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Walter Roberson 2022-4-13

That example works by having the calling program provide an update method that the called app is responsible for invoking in order to export changes. That is certainly a valid thing to do, but it is not the same as saying that your app has "output".

You asked "how do i send the updated data back to the mlapp that called myapp" and the example you are looking at does not do that: instead it tells the calling app to update itself. Different dynamic.

Mark Eigenraam 2022-4-13

Yes you are correct. I have written code (based on the Mathworks example) in the calling app now that updates its data, without closing the child app. I could have used better phrasing :)

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