How to interchange elements of an array?
显示 更早的评论
X = [ 4 2 3 6 5 1]
x1 = [2 3 1 2]
I want to interchange entries of X based on x1, that is
Output X =[4 6 2 3 5 1];
Any help is appreciated.
采纳的回答
X = [ 4 2 3 6 5 1];
x1 = [2 3 1 2];
Xnew = X;
for ii = 1:numel(x1)
Xnew([ii x1(ii)]) = Xnew([x1(ii) ii]);
end
Xnew
2 个评论
Noor Fatima
2022-3-28
Well, you can write down an expression to do it in this particular case:
X = [ 4 2 3 6 5 1];
Xnew = X([1 4 2 3 5 6])
But I don't think you can do it in general without using a loop somewhere, because the result of any swap depends on the results of the previous swaps, so it's necessarily an iterative process.
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