Sort Index - Bug
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Rainer Ng
am 19 Sep. 2019
Kommentiert: Walter Roberson
am 14 Apr. 2021
[a, sort_index]=sort([100;20;30;40])
The sort_index should return
4
1
2
3
But it does not.
0 Kommentare
Akzeptierte Antwort
Walter Roberson
am 19 Sep. 2019
>> [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);
4 Kommentare
Franziska Höppe
am 13 Apr. 2021
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
am 14 Apr. 2021
I never got that output; which code were you using, and which MATLAB version?
Weitere Antworten (1)
James Tursa
am 19 Sep. 2019
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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