matlab sort排序后，利用索引返回到原序列。

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% matlab sort排序后，利用索引返回到原序列
A=[ 15 3 5 7 2 1 12 17]
[sA index]=sort(A)
AA=sA(index)
%论坛上说这样可以，很明显。这样不对。求大神指点
A =
15 3 5 7 2 1 12 17
sA =
1 2 3 5 7 12 15 17
index =
6 5 2 3 4 7 1 8
AA =
12 7 2 3 5 15 1 17

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