How to detect a value changing in matlab app - numeric edit field

Question

Tom 2022-8-31

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1791480-how-to-detect-a-value-changing-in-matlab-app-numeric-edit-field

回答： Ankit 2022-8-31

Dear Community,

I am currently working on a MatLab app and i am changing the value of a numeric edit field by using a matlab function. Everytime the value changes, i want to execute an operation.

I tried to do it with a ValueChanged Callback, but i figured that it doesn´t work if you dont manually change the value of the edit field. Does anyone know how to detect a changed value if it isn´t changed manually but by another function?

I hope my Problem is clear. Thanks for helping in advance!

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Ankit 2022-8-31

what kind of operation you would like to execute?

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Answer 1

Ankit 2022-8-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1791480-how-to-detect-a-value-changing-in-matlab-app-numeric-edit-field#answer_1038590

在 MATLAB Online 中打开

ExampleNumericEditField.zip

@Tom: I have created one simple example for you.

In this example when the EditField values are changed I am doing different operations like addition, multiplication and division. EditField values i am changing from a function named "startSimulation(app)"

function startSimulation(app)
            i = 0;
            while i<=10 && app.stop_sim == false
                app.display.Value = num2str(i);
                pause(0);
                displayValueChanged(app)
                i = i + 2;
            end
end  

As I am not aware about your operations, you can imagine similar to yours.

I created a displayValueChanged function and then added to the Callbacks of EditField and Output.

 % Value changed function: Output, display
function displayValueChanged(app, event)
            value = app.display.Value;
            switch value
                case '2'
                    app.Operator.Text = '+';
                    app.Output.Value = app.A.Value + app.B.Value;
                case '4'
                    app.Operator.Text = '*';
                    app.Output.Value = app.A.Value*app.B.Value;
                case '10'
                    app.Operator.Text = '/';
                    app.Output.Value = app.A.Value/app.B.Value;
            end
end