loop for removing highest value until specific value is reached

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')

Answer 1

[Adam Danz]

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

[형준 이]

thank you for response

Answer 2

[David Hill]

[b,idx]=sort(A(:));
IDX=idx(cumsum(b)>=20);%linear index of each of the removed element's position

[형준 이]

thank you very much