Calculating grades in a while loop

Question

Angel Sanchez 2020-2-13

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评论： Angel Sanchez 2020-2-13

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.

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Answer 1

Bhaskar R 2020-2-13

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https://ww2.mathworks.cn/matlabcentral/answers/505243-calculating-grades-in-a-while-loop#answer_415364

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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

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Answer 2

Jakob B. Nielsen 2020-2-13

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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);