Sort Index - Bug
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Rainer Ng
el 19 de Sept. de 2019
Comentada: Walter Roberson
el 14 de Abr. de 2021
[a, sort_index]=sort([100;20;30;40])
The sort_index should return
4
1
2
3
But it does not.
0 comentarios
Respuesta aceptada
Walter Roberson
el 19 de Sept. de 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 comentarios
Franziska Höppe
el 13 de Abr. de 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
el 14 de Abr. de 2021
I never got that output; which code were you using, and which MATLAB version?
Más respuestas (1)
James Tursa
el 19 de Sept. de 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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