MATLAB 数组问题

Question

我目前正在编写一个可以进行多项选择测试的 MATLAB GUI。它的设计工作方式如下：

为了跟踪回答错误或正确的问题，我使用了一个由 1 和 0 组成的数组（1 是正确的，0 是不正确的）。数组中的每个索引位置代表相应的问题（数组称为 rightWrong、rightWrong(1) = 在 Q1 上的得分等）。我的问题是，无论我将 rightWrong 数组中的下一个位置设置为 1 还是 0，它都会将之前的所有值设置为 0。

GUI 由顶部的静态文本框、中间有四个单选按钮的按钮组、底部的两个按钮和左侧的两个复选框组成。在OpeningFcn 期间，我将submitButton（提交用户对问题的答案的按钮）和按钮组设置为不可见。按下 startButton（开始考试并提出第一个问题的按钮）后，它与复选框一起设置为不可见，同时将 submitButton 和按钮组设置为可见。这种格式用于程序的其余部分询问每个问题并接收用户的输入。

这是相关部分的代码。该行将两个子功能分开。

% --- Executes on button press in submitButton.
function submitButton_Callback(hObject, eventdata, handles)
% hObject    handle to submitButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

global counter questions answers name date qNum

% This is the section that I believe the problem occurs in. The rightWrong array
% is the one with the problem.  Buttons A through D are the radio buttons
% situated next to their corresponding answer choices

if qNum == 1
    rightWrong = ones(1, length(answers));
end
if (get(handles.buttonA,'Value') == 1) && (answers(qNum) == 'a')
    rightWrong(1,qNum) = 1
elseif (get(handles.buttonB,'Value') == 1) && (answers(qNum) == 'b')
    rightWrong(1,qNum) = 1
elseif (get(handles.buttonC,'Value') == 1) && (answers(qNum) == 'c')
    rightWrong(1,qNum) = 1
elseif (get(handles.buttonD,'Value') == 1) && (answers(qNum) == 'd')
    rightWrong(1,qNum) = 1
else
    rightWrong(1,qNum) = 0
end
counter = counter + 1;
if counter < length(questions)
    set(handles.textBox,'String',questions{counter});
    counter = counter + 1;
    set(handles.buttonA,'String',questions{counter});
    counter = counter + 1;
    set(handles.buttonB,'String',questions{counter});
    counter = counter + 1;
    set(handles.buttonC,'String',questions{counter});
    counter = counter + 1;
    set(handles.buttonD,'String',questions{counter});
    qNum = qNum + 1
else % This "else" statement can be ignored: the problem occurs before it is
     % triggered.
    if (length(name)~=0) && (length(date)~=0)
        newGUI(rightWrong, name, date)
    elseif (length(name)~=0) && (length(date)==0)
        newGUI(rightWrong, name)
    elseif (length(name)==0) && (length(date)~=0)
        newGUI(rightWrong, date)
    elseif (length(name)==0) && (length(date)==0)
        newGUI(rightWrong)
    end
end

_______________________________________________________________________________________
% --- Executes on button press in startButton.
function startButton_Callback(hObject, eventdata, handles)
% hObject    handle to startButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

global questions counter qNum
counter = 1;

%Make Invisible
set(handles.startButton,'Visible','off');
set(handles.checkID,'Visible','off');
set(handles.editID,'Visible','off');
set(handles.checkDate,'Visible','off');
set(handles.editDate,'Visible','off');

%Make Visible
set(handles.choiceGroup,'Visible','on');
set(handles.submitButton,'Visible','on');
set(handles.text1,'Visible','on');
set(handles.text2,'Visible','on');
set(handles.text3,'Visible','on');
set(handles.text4,'Visible','on');

% This sections lists the First Question as well as
% all of the possible answers by their respective radio buttons.
set(handles.textBox,'String',questions{counter});
counter = counter + 1;
set(handles.buttonA,'String',questions{counter});
counter = counter + 1;
set(handles.buttonB,'String',questions{counter});
counter = counter + 1;
set(handles.buttonC,'String',questions{counter});
counter = counter + 1;
set(handles.buttonD,'String',questions{counter});
qNum = 1;

抱歉，内容太多了，我不得不通过 GUI 组件更改很多可见性。如果有人知道更好的方法，请告诉我。

谢谢！

Answer 1

相当复杂的代码;)

我看到的一件事是 rightWrong 未在函数 submitButton_Callback 中声明。所以每次调用函数时都会重新创建它。您应该可以通过在函数开头添加persistent rightWrong 来修复它。虽然这取决于您希望如何读出结果...

就个人而言 - 不鼓励使用全局变量 - 如果启动第二个实例，可能会非常混乱您的应用程序。一个不错的选择是改用getappdata - setappdata。