在 MATLAB 中的一个框中从用户那里获取多个输入
Taking multiple inputs from user in one box in MATLAB
我想用 waitfor 运算符获取多个值，但我的代码不起作用。我的错误在哪里？
methods (Access = private)
% Callback function
function ButtonPushed(app, event)
%Reading dataset and getting the inputs from user by using input operation
matrix = xlsread("Transfusion.xlsx");
attributesNum = size(matrix,2) - 1 ;
X = zeros(attributesNum,1);
for i=1:attributesNum
waitfor(app.firstVal, 'Value');
value = app.firstVal.Value;
X(i,1) = value;
%Update text of ValuesLabel (for demostrating the concept).
text = ['Values: ', sprintf('%.1f, ', X(1:i))];
app.ValuesLabel.Text = text(1:end-2);
end
%Display X in Command window for testing
disp(X)
...
end
我认为它应该有效...
- 确保使用 MATLAB App Designer（您可以通过在命令 window 中输入
appdesigner 来启动它）。
- 确保在 MATLAB App Designer 中将编辑框命名为
firstVal：
- 将值设置为
Inf 是一个临时解决方案，但这很重要，因为 waitfor 等待值被更改。
输入新值后将值设置为 Inf 会强制用户更改值。
- 我用
matrix = [0, 0, 0, 0, 0, 0]; 替换了 matrix = xlsread("Transfusion.xlsx");。
备注：不要指望我们猜"Transfusion.xlsx".
的内容是什么
该文件与 post 无关，因为您只使用了大小。
- 备注：不要害羞，post整个 App Designer 代码作为参考（当使用像 App Designer 这样的工具时，该工具可能会在自动生成的代码中隐藏一些重要信息，这可能对于识别问题很重要）。
- 备注：既然是跟进post，你应该给你的
一个参考。
这是 function ButtonPushed(app, event) 的修改版本：
% Button pushed function: Button
function ButtonPushed(app, event)
app.Button.Enable = 'Off'; %Disable button while taking input (just nicer).
%I replaced the xlsread("Transfusion.xlsx") with some arbitrary values, because only the size is relevant
matrix = [0, 0, 0, 0, 0, 0]; %xlsread("Transfusion.xlsx");
attributesNum = size(matrix,2) - 1;
X = zeros(attributesNum, 1);
%Initialize text label with message
app.ValuesLabel.Text = ['Enter ', num2str(attributesNum), ' values in edit box (set value and press enter)'];
for i = 1:attributesNum
waitfor(app.firstVal, 'Value');
value = app.firstVal.Value;
X(i, 1) = value;
%Set to Inf every iteration, because waitfor waits for a change in value (and you may need to enter same value twice).
app.firstVal.Value = Inf;
%Update text of ValuesLabel (for demonstrating the concept).
text = ['Values: ', sprintf('%.1f, ', X(1:i))];
app.ValuesLabel.Text = text(1:end-2);
end
%Display X in Command window for testing
disp(X)
app.Button.Enable = 'On'; %Enable button at the end.
end
这里是完整的代码（包括生成的代码）。
您可以将其复制并粘贴到 App1.m 文件中，看看它是如何工作的。
classdef app1 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
EditFieldLabel matlab.ui.control.Label
firstVal matlab.ui.control.NumericEditField
ValuesLabel matlab.ui.control.Label
Button matlab.ui.control.Button
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: Button
function ButtonPushed(app, event)
app.Button.Enable = 'Off'; %Disable button while taking input (just nicer).
%I replaced the xlsread("Transfusion.xlsx") with some arbitrary values, because only the size is relevant
matrix = [0, 0, 0, 0, 0, 0]; %xlsread("Transfusion.xlsx");
attributesNum = size(matrix,2) - 1;
X = zeros(attributesNum, 1);
%Initialize text label with message
app.ValuesLabel.Text = ['Enter ', num2str(attributesNum), ' values in edit box (set value and press enter)'];
for i = 1:attributesNum
waitfor(app.firstVal, 'Value');
value = app.firstVal.Value;
X(i, 1) = value;
%Set to Inf every iteration, because waitfor waits for a change in value (and you may need to enter same value twice).
app.firstVal.Value = Inf;
%Update text of ValuesLabel (for demonstrating the concept).
text = ['Values: ', sprintf('%.1f, ', X(1:i))];
app.ValuesLabel.Text = text(1:end-2);
end
%Display X in Command window for testing
disp(X)
app.Button.Enable = 'On'; %Enable button at the end.
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 369 256];
app.UIFigure.Name = 'UI Figure';
% Create EditFieldLabel
app.EditFieldLabel = uilabel(app.UIFigure);
app.EditFieldLabel.HorizontalAlignment = 'right';
app.EditFieldLabel.Position = [45 123 56 22];
app.EditFieldLabel.Text = 'Edit Field';
% Create firstVal
app.firstVal = uieditfield(app.UIFigure, 'numeric');
app.firstVal.Position = [116 123 100 22];
app.firstVal.Value = Inf;
% Create ValuesLabel
app.ValuesLabel = uilabel(app.UIFigure);
app.ValuesLabel.Position = [49 51 297 22];
app.ValuesLabel.Text = 'Values: ';
% Create Button
app.Button = uibutton(app.UIFigure, 'push');
app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
app.Button.Tooltip = {'Press to start taking input'};
app.Button.Position = [46 204 120 32];
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = app1
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end
我想用 waitfor 运算符获取多个值，但我的代码不起作用。我的错误在哪里？
methods (Access = private)
% Callback function
function ButtonPushed(app, event)
%Reading dataset and getting the inputs from user by using input operation
matrix = xlsread("Transfusion.xlsx");
attributesNum = size(matrix,2) - 1 ;
X = zeros(attributesNum,1);
for i=1:attributesNum
waitfor(app.firstVal, 'Value');
value = app.firstVal.Value;
X(i,1) = value;
%Update text of ValuesLabel (for demostrating the concept).
text = ['Values: ', sprintf('%.1f, ', X(1:i))];
app.ValuesLabel.Text = text(1:end-2);
end
%Display X in Command window for testing
disp(X)
...
end
我认为它应该有效...
- 确保使用 MATLAB App Designer（您可以通过在命令 window 中输入
appdesigner来启动它）。 - 确保在 MATLAB App Designer 中将编辑框命名为
firstVal：
- 将值设置为
Inf是一个临时解决方案，但这很重要，因为waitfor等待值被更改。
输入新值后将值设置为Inf会强制用户更改值。 - 我用
matrix = [0, 0, 0, 0, 0, 0];替换了matrix = xlsread("Transfusion.xlsx");。
备注：不要指望我们猜"Transfusion.xlsx".
的内容是什么 该文件与 post 无关，因为您只使用了大小。 - 备注：不要害羞，post整个 App Designer 代码作为参考（当使用像 App Designer 这样的工具时，该工具可能会在自动生成的代码中隐藏一些重要信息，这可能对于识别问题很重要）。
- 备注：既然是跟进post，你应该给你的
这是 function ButtonPushed(app, event) 的修改版本：
% Button pushed function: Button
function ButtonPushed(app, event)
app.Button.Enable = 'Off'; %Disable button while taking input (just nicer).
%I replaced the xlsread("Transfusion.xlsx") with some arbitrary values, because only the size is relevant
matrix = [0, 0, 0, 0, 0, 0]; %xlsread("Transfusion.xlsx");
attributesNum = size(matrix,2) - 1;
X = zeros(attributesNum, 1);
%Initialize text label with message
app.ValuesLabel.Text = ['Enter ', num2str(attributesNum), ' values in edit box (set value and press enter)'];
for i = 1:attributesNum
waitfor(app.firstVal, 'Value');
value = app.firstVal.Value;
X(i, 1) = value;
%Set to Inf every iteration, because waitfor waits for a change in value (and you may need to enter same value twice).
app.firstVal.Value = Inf;
%Update text of ValuesLabel (for demonstrating the concept).
text = ['Values: ', sprintf('%.1f, ', X(1:i))];
app.ValuesLabel.Text = text(1:end-2);
end
%Display X in Command window for testing
disp(X)
app.Button.Enable = 'On'; %Enable button at the end.
end
这里是完整的代码（包括生成的代码）。
您可以将其复制并粘贴到 App1.m 文件中，看看它是如何工作的。
classdef app1 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
EditFieldLabel matlab.ui.control.Label
firstVal matlab.ui.control.NumericEditField
ValuesLabel matlab.ui.control.Label
Button matlab.ui.control.Button
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: Button
function ButtonPushed(app, event)
app.Button.Enable = 'Off'; %Disable button while taking input (just nicer).
%I replaced the xlsread("Transfusion.xlsx") with some arbitrary values, because only the size is relevant
matrix = [0, 0, 0, 0, 0, 0]; %xlsread("Transfusion.xlsx");
attributesNum = size(matrix,2) - 1;
X = zeros(attributesNum, 1);
%Initialize text label with message
app.ValuesLabel.Text = ['Enter ', num2str(attributesNum), ' values in edit box (set value and press enter)'];
for i = 1:attributesNum
waitfor(app.firstVal, 'Value');
value = app.firstVal.Value;
X(i, 1) = value;
%Set to Inf every iteration, because waitfor waits for a change in value (and you may need to enter same value twice).
app.firstVal.Value = Inf;
%Update text of ValuesLabel (for demonstrating the concept).
text = ['Values: ', sprintf('%.1f, ', X(1:i))];
app.ValuesLabel.Text = text(1:end-2);
end
%Display X in Command window for testing
disp(X)
app.Button.Enable = 'On'; %Enable button at the end.
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 369 256];
app.UIFigure.Name = 'UI Figure';
% Create EditFieldLabel
app.EditFieldLabel = uilabel(app.UIFigure);
app.EditFieldLabel.HorizontalAlignment = 'right';
app.EditFieldLabel.Position = [45 123 56 22];
app.EditFieldLabel.Text = 'Edit Field';
% Create firstVal
app.firstVal = uieditfield(app.UIFigure, 'numeric');
app.firstVal.Position = [116 123 100 22];
app.firstVal.Value = Inf;
% Create ValuesLabel
app.ValuesLabel = uilabel(app.UIFigure);
app.ValuesLabel.Position = [49 51 297 22];
app.ValuesLabel.Text = 'Values: ';
% Create Button
app.Button = uibutton(app.UIFigure, 'push');
app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
app.Button.Tooltip = {'Press to start taking input'};
app.Button.Position = [46 204 120 32];
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = app1
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end