MATLAB Array Issue

Question

我正在編寫一個MATLAB GUI，它將提供多選題測試。它的設計工作方式如下：

爲了跟蹤回答錯誤或正確的問題，我使用1和0的數組（1是正確的，0是不正確的）。數組中的每個索引位置表示相應的問題（該數組稱爲rightWrong，rightWrong（1）= Q1上的分數等）。我的問題是，不管我是否將右邊的錯誤數組中的下一個位置設置爲1或0，它將將所有先前的值設置爲0.

GUI由頂部的靜態文本框，按鈕組，中央有四個單選按鈕，底部有兩個按鈕，左側有兩個複選框。在OpeningFcn期間，我將submitButton（提交用戶對問題的答案的按鈕）和按鈕組設置爲不可見。按下startButton（啓動考試並顯示第一個問題的按鈕）後，將submitButton和按鈕組顯示爲可見時，將其設置爲不可見以及複選框。該格式用於該程序的其餘部分來詢問每個問題並接收用戶的輸入。

以下是相關部分的代碼。該行分隔了兩個子功能。

% --- 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; 

對不起，有這麼多，我不得不做很多與GUI組件的可見性變化。如果有人知道更好的方法來做到這一點，請讓我知道。

謝謝！

Answer 1

相當複雜的代碼;）

一件事，我看到的是， rightWrong沒有在功能submitButton_Callback聲明。所以每次調用函數時都會重新創建它。您應該可以通過在函數的開始處添加persistent rightWrong來修復它。雖然這取決於你想要如何讀出結果...

個人消息 - 使用全局變量不鼓勵 - 如果第二個實例啓動，可能會讓應用程序變得非常混亂。一個好的選擇是使用getappdata - setappdata來代替。