matlab appdesigner中按钮控件选择文件在坐标区中画图，并在下拉框选择方法在第二个坐标区画图

以下是一个使用MATLAB App Designer的示例代码，其中包含一个按钮控件和一个下拉框控件。当单击按钮时，它将打开一个文件选择对话框，用户可以选择一个数据文件。然后，根据下拉框中选择的方法，在第一个坐标区中绘制数据的图形，在第二个坐标区中绘制方法的图形。 ```matlab classdef MyApp < matlab.apps.AppBase % Properties that correspond to app components properties (Access = public) UIFigure matlab.ui.Figure SelectFileButton matlab.ui.control.Button MethodDropDown matlab.ui.control.DropDown Axes1 matlab.ui.control.UIAxes Axes2 matlab.ui.control.UIAxes end % Properties that correspond to app data properties (Access = public) Data % data from selected file end % Callbacks that handle component events methods (Access = private) % Button pushed function: SelectFileButton function SelectFileButtonPushed(app, event) % open file dialog and select data file [filename, pathname] = uigetfile({'*.txt';'*.csv'}, 'Select Data File'); if isequal(filename,0) || isequal(pathname,0) % user cancelled file selection return; end % read data from file data = dlmread(fullfile(pathname, filename)); app.Data = data; % plot data in Axes1 plot(app.Axes1, data(:,1), data(:,2)); end % Value changed function: MethodDropDown function MethodDropDownValueChanged(app, event) % get selected method method = app.MethodDropDown.Value; % plot method in Axes2 switch method case 'Method 1' plot(app.Axes2, app.Data(:,1), app.Data(:,2).^2); case 'Method 2' plot(app.Axes2, app.Data(:,1), app.Data(:,2).^3); otherwise error('Unknown method selected'); 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 SelectFileButton app.SelectFileButton = uibutton(app.UIFigure, 'push'); app.SelectFileButton.ButtonPushedFcn = createCallbackFcn(app, @SelectFileButtonPushed, true); app.SelectFileButton.Position = [30 440 100 22]; app.SelectFileButton.Text = 'Select File'; % Create MethodDropDown app.MethodDropDown = uidropdown(app.UIFigure); app.MethodDropDown.Items = {'Method 1', 'Method 2'}; app.MethodDropDown.ValueChangedFcn = createCallbackFcn(app, @MethodDropDownValueChanged, true); app.MethodDropDown.Position = [170 440 100 22]; app.MethodDropDown.Value = 'Method 1'; % Create Axes1 app.Axes1 = uiaxes(app.UIFigure); title(app.Axes1, 'Data'); xlabel(app.Axes1, 'X'); ylabel(app.Axes1, 'Y'); app.Axes1.Position = [30 60 250 350]; % Create Axes2 app.Axes2 = uiaxes(app.UIFigure); title(app.Axes2, 'Method'); xlabel(app.Axes2, 'X'); ylabel(app.Axes2, 'Y'); app.Axes2.Position = [330 60 250 350]; end end % App creation and deletion methods (Access = public) % Construct app function app = MyApp % Create UIFigure and components createComponents(app) % Initialize data app.Data = []; % Show the figure after all components are created app.UIFigure.Visible = 'on'; end end end ```