matlab app designer里用List Box 和Button实现从四种函数中选择一个函数进行plot命令绘图，可以主动切换方法，然后点击button出图象，List Box用switch的方法

好的，那我们可以先创建一个 List Box 和一个 Button，然后在 List Box 中添加四种函数的名称，用 switch-case 语句实现根据用户选择的函数名称来选择对应的函数进行绘图。最后在 Button 的回调函数中调用选择的函数进行绘图。

下面是一个示例代码：

classdef MyApp < matlab.apps.AppBase

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

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

        % Button pushed function: Button
        function ButtonPushed(app, event)
            % Get the selected function name from ListBox
            selectedFunction = app.ListBox.Value;
            
            % Call the corresponding function based on the selected name
            switch selectedFunction
                case 'sin'
                    x = linspace(0, 2*pi, 100);
                    y = sin(x);
                    plot(app.Axes, x, y);
                    
                case 'cos'
                    x = linspace(0, 2*pi, 100);
                    y = cos(x);
                    plot(app.Axes, x, y);
                    
                case 'tan'
                    x = linspace(-pi/2, pi/2, 100);
                    y = tan(x);
                    plot(app.Axes, x, y);
                    
                case 'exp'
                    x = linspace(-5, 5, 100);
                    y = exp(x);
                    plot(app.Axes, x, y);
            end
        end
    end

    % App initialization and construction
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)
            % Create UIFigure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'My App';

            % Create ListBox
            app.ListBox = uilistbox(app.UIFigure);
            app.ListBox.Items = {'sin', 'cos', 'tan', 'exp'};
            app.ListBox.Position = [50 100 100 200];

            % Create Button
            app.Button = uibutton(app.UIFigure, 'push');
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
            app.Button.Position = [200 150 100 22];
            app.Button.Text = 'Plot';

            % Create Axes
            app.Axes = uiaxes(app.UIFigure);
            title(app.Axes, 'Plot');
            xlabel(app.Axes, 'X');
            ylabel(app.Axes, 'Y');
            app.Axes.Position = [350 100 250 200];
        end
    end

    % App lifecycle management
    methods (Access = public)

        % Construct app
        function app = MyApp
            % Create and configure components
            createComponents(app)

            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
end

这里我们创建了一个名为 `MyApp` 的 App，并在其中添加了一个 ListBox、一个 Button 和一个 Axes。ListBox 中添加了四种函数名称，Button 的回调函数中根据用户选择的函数名称调用对应的函数进行绘图。最后将绘制的图像显示在 Axes 中。