Calculating grades in a while loop

If I have a array of students grade scores, score=[82, 75, 78, 82, 90, 87], and i want to calculate the number of A's, B's. How would i do that for example to be a grade of A it must be greater or equal to 90, which on the score is shows 2. How can i output that which it will give me the value of 2, as well as for b which would give me 3 which is greater or equlat to 80.

Answer 1

[Bhaskar R]

grade_A = sum(score>=90);
grade_B = sum(score>=80 & score<90);

For more details on loops and conditionings read

https://in.mathworks.com/help/matlab/matlab_prog/loop-control-statements.html

https://in.mathworks.com/help/matlab/matlab_prog/conditional-statements.html

Answer 2

[Jakob B. Nielsen]

You don't need a while loop for that - it is easy with logic indexing, like so:

score=[82 75 78 82 90 87];
A=score(score>=90);  %take the indexes of score, for which that same index of score is greater than or equal to 90. 
numA=numel(A);

B=score(score>=80 & score<90);
numB=numel(B);

[Angel Sanchez]

correct but on my hw problem its mentioning using a loop.

[Jakob B. Nielsen]

Weird homework to ask you to do more than you need. You should be cheeky, and hand in the above solution as well as the loop :D

Must it be a while loop, specifically, or can it be a for loop?

[Angel Sanchez]

yes a while loop