Accessing information within a structure in app designer and How to pass data from one push-button to the other

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Curious Mind 2020-7-18

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评论： Curious Mind 2020-7-20

Hi, I am developing a simple app using the app designer. This is pretty new to me and I am not experienced when it comes to app designer or gui in general. I have the code below,

for i = numel(F(2)) 
    U_R = [F.y]';
end

Now F is a structure. It has 3 columns. Column 2 is labeled y and I want to assign y to U_R using U_R = [F.y]. When I run the gui I get an error '' Undefined fuction F for input arguments of type double'. How do I fix this problem?
Also how do I add a property section such that I can access or pass data to every pushbutton in the gui (app)?

Thank you!

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Rachel Surridge 2020-7-18

在 MATLAB Online 中打开

2. If F is in your base MATLAB workspace, you can import it into your app using a statement like this in the properties section of the app:

properties (Access = private)
    F = evalin('base', 'F');
end

If the for loop you posted originally is inside the app, then I think the code above should resolve your first question too. F is likely not being recognized as a structure because the app doesn't know where to find it. Using the evalin statement will put F in a workspace that the app can access, so it will be able to recognize it as a structure.

Curious Mind 2020-7-20

Hi Rachel, thanks for the code. F is not being displayed in the workspace. When I run the code on the matlab command line and F appears in the workspace and then I run the app using your code the it works. Is there a way I can pass information/output from the app to the workspace? As long as F appears in the workspace then your code will work because the app will recognize it. Thanks!

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Answer 1

Cris LaPierre 2020-7-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/567141-accessing-information-within-a-structure-in-app-designer-and-how-to-pass-data-from-one-push-button-t#answer_467730

In the upper left of app designer, you will have the ability to create properties. Use this to add a property to the app structure. This is what makes it available to all functions inside your app. See this page for speciic details.