# loop for removing highest value until specific value is reached

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형준 이 on 18 Jul 2022
Commented: 형준 이 on 19 Jul 2022
for exmaple,
for 10x10 matrix A
i want to make loop which removes highest element until sum of A is less than 20
and i want to know each removed element's position
i think 'while-loop' is needed
( I only know finding the first highest value using 'for-loop')

Adam Danz on 18 Jul 2022
A = randi(13,10);
while sum(A,'all','omitnan')>20
[~,idx] = max(A(:),[],'omitnan');
A(idx) = NaN;
end
isRemoved = isnan(A)
isRemoved = 10×10 logical array
1 1 0 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 0 1 1 1
sum(A,'all','omitnan')
ans = 19
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형준 이 on 19 Jul 2022
thank you for response

### More Answers (1)

David Hill on 18 Jul 2022
[b,idx]=sort(A(:));
IDX=idx(cumsum(b)>=20);%linear index of each of the removed element's position
##### 1 CommentShowHide None
형준 이 on 19 Jul 2022
thank you very much

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