Sort function indices in regards to the original data?

조회 수: 6 (최근 30일)
Nope
Nope 2024년 1월 30일
편집: Matt J 2024년 1월 31일
Using the sort function in descending order results in correctly sorted values, but incorrect indices (in regards to the original data):
[val,idx] = sort([86.9565 69.5652 65.2174 52.1739 43.4783 65.2174 91.3043 60.8696],'descend')
val =
91.3043 86.9565 69.5652 65.2174 65.2174 60.8696 52.1739 43.4783
idx =
7 1 2 3 6 8 4 5
The correct idx should be: 2 3 4 7 8 5 1 6
I should note that I want the idx in regards to the original data, e.g. first element of tre vector is 86.9565, what is the idx of this in the sorted vector. Correct answer would be 2, but Matlab gives the idx in regards to the sorted data.
Is there a way to get the idx in regards to the original data?

채택된 답변

the cyclist
the cyclist 2024년 1월 31일
편집: the cyclist 2024년 1월 31일
In response to your comment on my other answer (which I posted before you edited your question), here is how to get what you want:
[val,idx] = sort([86.9565 69.5652 65.2174 52.1739 43.4783 65.2174 91.3043 60.8696],'descend');
[~,idx2] = sort(idx)
idx2 = 1×8
2 3 4 7 8 5 1 6
  댓글 수: 2
Nope
Nope 2024년 1월 31일
Perfect, thank you!
Matt J
Matt J 2024년 1월 31일
편집: Matt J 2024년 1월 31일
You don't need the overhead of a second sort operation to get the desired idx2. See below.

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추가 답변 (2개)

Matt J
Matt J 2024년 1월 31일
편집: Matt J 2024년 1월 31일
[val,is] = sort([86.9565 69.5652 65.2174 52.1739 43.4783 65.2174 91.3043 60.8696],'descend');
idx=1:numel(val);
idx(is)=idx;
val,
val = 1×8
91.3043 86.9565 69.5652 65.2174 65.2174 60.8696 52.1739 43.4783
idx,
idx = 1×8
2 3 4 7 8 5 1 6

the cyclist
the cyclist 2024년 1월 31일
I'm not sure why you think it should be [2 3 4 7 8 5 1 6].
But, the output is correct.
  • The 7th element is the largest
  • The 1st element is next largest
  • ...
  • The 5th element is the smallest

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