MATLAB Array Issue

Question

我正在编写一个MATLAB GUI，它将提供多选题测试。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1和0的数组（1是正确的，0是不正确的）。数组中的每个索引位置表示相应的问题（该数组称为rightWrong，rightWrong（1）= Q1上的分数等）。我的问题是，不管我是否将右边的错误数组中的下一个位置设置为1或0，它将将所有先前的值设置为0.

GUI由顶部的静态文本框，按钮组，中央有四个单选按钮，底部有两个按钮，左侧有两个复选框。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（启动考试并显示第一个问题的按钮）后，将submitButton和按钮组显示为可见时，将其设置为不可见以及复选框。该格式用于该程序的其余部分来询问每个问题并接收用户的输入。

以下是相关部分的代码。该行分隔了两个子功能。

% --- 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; 

对不起，有这么多，我不得不做很多与GUI组件的可见性变化。如果有人知道更好的方法来做到这一点，请让我知道。

谢谢！

Answer 1

相当复杂的代码;）

一件事，我看到的是， rightWrong没有在功能submitButton_Callback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的开始处添加persistent rightWrong来修复它。虽然这取决于你想要如何读出结果...

个人消息 - 使用全局变量不鼓励 - 如果第二个实例启动，可能会让应用程序变得非常混乱。一个好的选择是使用getappdata - setappdata来代替。