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How to implement a Matlab code that choose from random questions?

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Leonardo Molino
Leonardo Molino on 30 Oct 2020
Commented: Leonardo Molino on 31 Oct 2020 at 19:10
Hello everyone,
I was planning to implement a code in Matlab that generates a test. I have the questions and the answers and I would like the student to choose the correct answer, for each question, between 'a', 'b' and 'c'.
In short, I have a database of questions and solutions and I would like to generate a quiz with 30 questions randomly.
Thanks!

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Answers (2)

Ameer Hamza
Ameer Hamza on 30 Oct 2020
You can use randperm() to generate a sequence of random numbers without repetition. For example, if you have a database of 100 questions and you want to choose 30 at random, you can do it like this
idx = randperm(100, 30);
'idx' will give the question number (out of 100) to include in a test.

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Steven Lord
Steven Lord on 30 Oct 2020
Can you post two or three sample questions as they would be formatted in the file, so we can get a sense of the format and how best to read that information into MATLAB? Or can you attach a file (using the paperclip icon in the Insert section of the toolbar) with two or three files as they would be written in the text file?
Leonardo Molino
Leonardo Molino on 31 Oct 2020 at 12:03
Sure.
***
Question #1. TITLE OF THE QUESTION HERE.
A - ANSWER HERE
B - ANSWER HERE
C- ANSWER HERE
***
Something like that

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Image Analyst
Image Analyst on 30 Oct 2020
Try this:
fullFileName = fullfile(pwd, 'Questions.txt');
if ~isfile(fullFileName)
% Didn't find file. Alert user.
errorMessage = sprintf('Error: %s does not exist.', fullFileName);
uiwait(warndlg(errorMessage));
return;
end
% Open the file for reading in text mode.
fileID = fopen(fullFileName, 'rt');
% Read the first line of the file.
textLine = fgetl(fileID);
lineCounter = 1;
questions{lineCounter} = textLine;
while ischar(textLine)
% Print out what line we're operating on.
fprintf('%s\n', textLine);
% Read the next line.
textLine = fgetl(fileID);
lineCounter = lineCounter + 1;
if ischar(textLine)
questions{lineCounter} = textLine;
end
end
% All done reading all lines, so close the file.
fclose(fileID);
numQuestions = length(questions)
randomOrder = randperm(numQuestions)
numQuestionsToAsk = 2;
for k = 1 : numQuestionsToAsk
thisQuestionNumber = randomOrder(k);
promptMessage = questions{thisQuestionNumber};
titleBarCaption = 'Continue?';
buttonText = questdlg(promptMessage, titleBarCaption, 'A', 'B', 'C', 'A')
end
Change the attached file to put in whatever questions you want.

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Leonardo Molino
Leonardo Molino on 31 Oct 2020 at 16:10
The code works very fine, thanks.
I'm trying to figure out how to implement a code that also checks if the entered answer is the correct one.
Image Analyst
Image Analyst on 31 Oct 2020 at 18:33
Make a cell array of letters with the correct answers, like
answers = {'A', 'B', 'A', 'C'};
Then see if the response matches:
if strcmpi(buttonText, answers{k})
% A correct response was selected.
else
% An incorrect response was selected.
end

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