create an app and add a button in matlab

To create an app with a button in MATLAB, use the App Designer tool that is built into MATLAB. Follow these steps:

Open MATLAB and click on the "APPS" tab.
Click on "App Designer" to open the App Designer tool.
From the "Design" tab, drag and drop a "Button" from the "Components" section to the blank window.
Double-click the button to open the "Code View" to set the button's properties and assign a callback function.
In the "Callback properties" section of the "Code View" window, select the "ButtonPushedFcn" property and click the "Edit" button.
In the callback function, write the code that will run when the button is clicked. For example, you can print a message to the command window or perform a mathematical calculation.

Here is an example of MATLAB code to create an app with a button:


main.m
classdef MyApp < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure     matlab.ui.Figure
        PushButton   matlab.ui.control.Button
    end

    % Callbacks that handle component events
    methods (Access = private)

        % Code that executes after component creation
        function startupFcn(app)

            % Set the button text
            app.PushButton.Text = 'Click me!';

        end

        % Button pushed function: PushButton
        function PushButtonPushed(app, event)

            % Code to run when button is clicked
            disp('Button clicked!');

        end
    end

    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = MyApp

            % Create the UIFigure and components
            createComponents(app)

            % Run the startup function
            runStartupFcn(app, @startupFcn);

            % Register the app with App Designer
            registerApp(app, app.UIFigure);

            % Execute the startup function
            if nargout == 0
                clear app
                return
            end

        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create the UIFigure
            app.UIFigure = uifigure;

            % Create the button
            app.PushButton = uibutton(app.UIFigure, 'push');
            app.PushButton.Position = [100 100 100 22];

        end
    end

end
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Note that the above code creates a MyApp class which extends matlab.apps.AppBase. It contains a UIFigure property which is the main window of the app, and a PushButton property which is the button. The class also defines two methods, startupFcn and PushButtonPushed, which respectively set the button text and handle the button click event.

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