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Swapping Blocks in a Matrix

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Jordan Means
Jordan Means am 12 Sep. 2018
Kommentiert: Stephen23 am 12 Sep. 2018
Hello. I'm trying to swap the first two numbers of the first and second rows of this test matrix with the last two numbers of the second and third rows. Is there any way to swap these numbers in a matrix that's not one row and/or not on the same row?
x = [1 2 3 4 5;
6 7 8 9 10;
11 12 13 14 15]
The result should be:
x = [9 10 3 4 5;
14 15 8 1 2;
11 12 13 6 7]

Akzeptierte Antwort

Stephen23
Stephen23 am 12 Sep. 2018
Bearbeitet: Stephen23 am 12 Sep. 2018
>> x = [1,2,3,4,5;6,7,8,9,10;11,12,13,14,15]
x =
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
>> x([1,4,11,14]) = x([11,14,1,4])
x =
9 10 3 4 5
6 7 8 1 2
11 12 13 14 15
You can easily generate those linear indices with sub2ind.
  1 Kommentar
Jordan Means
Jordan Means am 12 Sep. 2018
The code to do it was actually this:
x([1,2,4,5,11,12,14,15]) = x([11,12,14,15,1,2,4,5])
...but thanks! I got the gist of it!

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Bruno Luong
Bruno Luong am 12 Sep. 2018
Bearbeitet: Bruno Luong am 12 Sep. 2018
[x(1:2,1:2) x(2:3,4:5)] = deal(x(2:3,4:5),x(1:2,1:2))

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