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For loop not executing

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NAMRATA SINGH
NAMRATA SINGH 2016-11-26
关闭： MATLAB Answer Bot 2021-8-20
Hello ,
I am trying to run this for loop and again it stops at section four where it displays letters 'L P E D' but after that it is stuck without any error message.
for i = 1:8
if i == 1
j = 'E';
figure('units','normalized', 'outerposition',[0 0 1 1], 'color', [1 1 1 1])
axis off
text(.45, .6, 'E', 'fontname', 'Times', 'fontsize', 200)
pause
LetterOne = input('What letter did you see on the screen?', 's')
LetterOne = upper(LetterOne)
return_value = strcmp(j,LetterOne)
if return_value == 1,
disp ' Press a key to continue'
else return_value == 0,
disp('Thank you participating in the vision test.')
disp('Your vision is 20/200');
break
end
clf
end
if i == 2
j = 'F P';
figure('units','normalized', 'outerposition',[0 0 1 1], 'color', [1 1 1 1])
axis off
text(.40, .6, 'F P', 'fontname', 'Times', 'fontsize', 100)
pause
LetterTwo = input('What letter did you see on the screen?', 's')
LetterTwo = upper(LetterTwo)
return_value = strcmp(j,LetterTwo)
if return_value == 1,
disp ' Press a key to continue'
else return_value == 0,
disp('Thank you participating in the vision test.')
disp('Your vision is 20/100');
break
end
clf
end
if i == 3
j = 'T O Z';
figure('units','normalized', 'outerposition',[0 0 1 1], 'color', [1 1 1 1])
axis off
text(.45, .6, 'T O Z', 'fontname', 'Times', 'fontsize', 70)
pause
LetterThree = input('What letter did you see on the screen?', 's')
LetterThree = upper(LetterThree)
return_value = strcmp(j,LetterThree)
if return_value == 1,
disp ' Press a key to continue'
else return_value == 0,
disp('Thank you participating in the vision test.')
disp('Your vision is 20/70');
break
end
clf,close
end
if i == 4
j = 'L P E D';
figure('units','normalized', 'outerposition',[0 0 1 1], 'color', [1 1 1 1])
axis off
text(.45, .6, 'L P E D', 'fontname', 'Times', 'fontsize', 50)
pause
LetterFour = input('What letter did you see on the screen?', 's')
LetterFour = upper(LetterFour)
return_value = strcmp(j,LetterFour)
if return_value == 1,
disp ' Press a key to continue'
else return_value == 0,
disp('Thank you participating in the vision test.')
disp('Your vision is 20/50');
break
end
clf, close
end
if i == 5
j = 'P E C F D';
figure('units','normalized', 'outerposition',[0 0 1 1], 'color', [1 1 1 1])
axis off
text(.35, .6, 'P E C F D', 'fontname', 'Times', 'fontsize', 40)
pause
LetterFive = input('What letter did you see on the screen?', 's')
LetterFive = upper(LetterFive)
return_value = strcmp(j,LetterFive)
if return_value == 1,
disp ' Press a key to continue'
else return_value == 0,
disp('Thank you participating in the vision test.')
disp('Your vision is 20/40');
break
end
clf, close all
end
if i == 6
j = 'E D P C F Z';
figure('units','normalized', 'outerposition',[0 0 1 1], 'color', [1 1 1 1])
axis off
text(.40, .6, 'E D P C F Z', 'fontname', 'Times', 'fontsize', 30)
pause
LetterSix = input('What letter did you see on the screen?', 's')
LetterSix = upper(LetterSix)
return_value = strcmp(j,LetterSix)
if return_value == 1,
disp ' Press a key to continue'
else return_value == 0,
disp('Thank you participating in the vision test.')
disp('Your vision is 20/30');
break
end
clf, close
end
if i == 7
j = 'F E L O P Z D';
figure('units','normalized', 'outerposition',[0 0 1 1], 'color', [1 1 1 1])
axis off
text(.45, .55, 'F E L O P Z D', 'fontname', 'Times', 'fontsize', 25)
pause
LetterSeven = input('What letter did you see on the screen?', 's')
LetterSeven = upper(LetterSeven)
return_value = strcmp(j,LetterSeven)
if return_value == 1,
disp ' Press a key to continue'
else return_value == 0,
disp('Thank you participating in the vision test.')
disp('Your vision is 20/25');
break
end
clf, close
end
if i == 8
j = 'D E F P O T E C';
figure('units','normalized', 'outerposition',[0 0 1 1], 'color', [1 1 1 1])
axis off
text(.45, .6, 'D E F P O T E C', 'fontname', 'Times', 'fontsize', 20)
pause
LetterEight = input('What letter did you see on the screen?', 's')
LetterEight = upper(LetterEight)
return_value = strcmp(j,LetterEight)
if return_value == 1,
disp ' Press a key to continue'
else return_value == 0,
disp('Thank you participating in the vision test.')
disp('Your vision is 20/20');
break
end
clf, close
end
end

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回答（2 个）

Image Analyst
Image Analyst 2016-11-26
We'd have to step through this long program with the debugger, just like you. I think you should be able to do it as well as us. If you don't know how to do it, see this nice tutorial: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/
Walter Roberson
Walter Roberson 2016-11-26
Your "close all" is probably interfering
Instead of using close like that, you should be recording the handle returned from figure() and close() that specific handle.

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