Swap all the values in a vector
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I have the vector x=[1 2 3 4 5 6 7 8] and I want to create another one in which I have swaped the elements as (17)(24)(38)(56), that is the new vector is [7 4 8 2 6 5 1 3].
Note that I have lots of vectors in which the number 1,...,8 are in different positions. So, I need to make a connection between the numbers, that is for example (17)(24)(38)(56), but not between the positions of the numbers in the vectors.
Is there any function in Matlab so as to achieve it?
Thanks!
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Thiago Henrique Gomes Lobato
il 12 Apr 2020
Modificato: Thiago Henrique Gomes Lobato
il 12 Apr 2020
rng(31415)
x=[ 1 2 3 4 5 6 7 8];
p = randperm(length(x));
xnew = x(p)
xnew =
7 8 1 2 6 4 5 3
If you want only the specific case of your given permutation, you can do it by indexing and it looks like this:
xnew = x([7 4 8 2 6 5 1 3])
ans =
7 4 8 2 6 5 1 3
2 Commenti
Thiago Henrique Gomes Lobato
il 12 Apr 2020
Sorry, I misunderstood your question. This code does what you want:
xref=[ 1 2 3 4 5 6 7 8];
x=[3 5 2 1 7 8 6 4];
[xsort,sortedIndex] = sort(x);
RightOrder = sortedIndex([7 4 8 2 6 5 1 3]); % Indexing in sorted array, so always the same
xnew = x;
xnew(RightOrder) = xref
x =
8 6 4 7 1 3 5 2
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