Sort Index - Bug
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[a, sort_index]=sort([100;20;30;40])
The sort_index should return
4
1
2
3
But it does not.
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채택된 답변
Walter Roberson
2019년 9월 19일
>> [a, sort_index]=sort([100;20;30;40])
a =
20
30
40
100
sort_index =
2
3
4
1
This output is correct. It tells you that a(1) == 20 came from element #2 of the input, and that a(2) == 30 came from element 3 in the input, and that a(3) == 40 came from element 4 of the input, and that a(4) == 100 came from element 1 of the input.
To get the output you want, use
b(sort_index) = 1:length(sort_index);
댓글 수: 4
Franziska Höppe
2021년 4월 13일
Thank you for you detailed answer! :-)
The issue is if you let run the loop, you get a different result. You get:
2
5
2
Do you know why?
Walter Roberson
2021년 4월 14일
I never got that output; which code were you using, and which MATLAB version?
추가 답변 (1개)
James Tursa
2019년 9월 19일
The sort index gives the location in the original array of the sorted values. I.e., the sort results "a" are "original_array(sort_index)"
>> x = [100;20;30;40];
>> [a,sort_index] = sort(x)
a =
20
30
40
100
sort_index =
2
3
4
1
>> x(sort_index)
ans =
20
30
40
100
>> isequal(x(sort_index),a)
ans =
1
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