Help with conditional statements

Dear all,

I am new to matlab and I am trying to solve the following question... I already tried the help function and google, but I am kind of stuck. The question is: A student passes the exam if the grade on each of the four tests is greater or equal to 6. If this requirement is not met (that is, at least one of the four tests was graded with 5 or less), the student can pass the exam, performing an additional resit test, if the average score (on the four tests) is greater or equal to 6, otherwise the exam is failed. This is as far as I got... (The first column is the ID of the student, columns 2-4 are restults of individual tests)

Scores= [1 7 10 9 9;2 6 8 7 6;3 9 10 10 9;4 4 7 6 5;5 7 8 8 9; 6 8 10 9 10; 7 5 6 7 6; 8 8 9 7 6; 9 7 8 8 5; 10 8 10 8 10]

ScoresMean=Scores; ScoresMean(:,1)=[]; mean(ScoresMean,2) % gives mean scores (per row)

ScoresNoID=Scores; ScoresNoID(:,1)=[]; if ScoresNoID(1,:)>6 disp('pass') elseif ScoresNoID(1,:)<6 disp('fail') if ScoresNoID(1,:)<6 = mean(ScoresNoID,2)>6 % this might be wrong... disp('resit')

as you can see, I am already stuck at the beginning. I would appreciate any help!

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

Answer 1

[dpb]

Need to read up on logicals in Matlab...I'll post a possible solution and leave it to you to tell me how and why it works and display the results in pretty format...

pass=all(Scores(:,2:end)>=6,2);
resit=mean(Scores(:,2:end),2)>=6 & ~pass;
fail=~pass&~resit;

[Marcel]

Thanks for the answer! I looked the logicals up and understand what you did there! I came up with the following, according to your answer:

Scores2=Scores

Scores2(:,1)=[]

pass=all(Scores2>=6,2)

resit=mean(Scores2>=6,2) & ~pass

fail=~pass&~resit

the only thing I don't understand is the last "2" in pass=all(Scores2>=6,2).

[dpb]

Since this is clearly homework, I'll just throw that back to you --

doc all  % explains all :)

And, now figure out how you're going to explain to your instructor how you came up with this solution... :)

Oh, and for submittal I'd expect a useful display of results identifying each student with their result. How you might go about that and what is the real interpretation programmatically of the result you have at the moment?

[Image Analyst]

Evidently he totally ignored by link above about how to format code.