How to delete two minimum elements in a vector?
조회 수: 14 (최근 30일)
이전 댓글 표시
wonder how to delete two minimum elements in the vector and then calculate the mean value of new vector
the vector is like A=[ 70, 56 , 30, 10 , 83 , 78, 77, 90]
code should be flexibe enough to calculate for any vectors
댓글 수: 2
Walter Roberson
2019년 1월 20일
Suppose A had three values that were all (say) 9. All 3 of them are the minimum. What do you want to do in that situation?
Image Analyst
2019년 1월 20일
Your request is very imprecise.
What would you return for
v = [1 1 1 2 2 2 3]
??? Would you return
- [1 2 2 2 3] (removing a pair of 1's), or
- [3] (removing all the 1's and all the 2's?
채택된 답변
madhan ravi
2019년 1월 20일
편집: madhan ravi
2019년 1월 20일
EDITED
n=2; % two smallest values
u=unique(A);
if numel(u)==1 || numel(u)==2
Result=[]
else
Result=mean(A(~ismember(A,u(1:n))))
end
댓글 수: 6
madhan ravi
2019년 1월 20일
Thank you sir Image Analyst edited the answer and sir Walter thank you for considering different situations.
추가 답변 (2개)
Erik Keever
2019년 1월 20일
Hmm. Perhaps,
% generate some random junk
x = round(10*rand([24 1]));
% sort array
[~, idx] = sort(x);
% sort the indices of the (N-2) largest elements, cutting the 2 smallest out and select subset
xTrimmed = x(sort(idx(3:end)));
I've taken that you mean to remove precisely two elements which are lexcographically smallest. My code breaks the degeneracy among multiple smallest values by choosing the first ones to occur in the array, such that among [4 1 1 0 4 4 4], the 0 and the first 1 will be removed. For large arrays, avoiding my lazy second sort() by building the subsets explicitly would be faster (removing one of two N log N sort procedures).
댓글 수: 0
참고 항목
카테고리
Help Center 및 File Exchange에서 Logical에 대해 자세히 알아보기
제품
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!