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Swapping Blocks in a Matrix

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Jordan Means
Jordan Means on 12 Sep 2018
Commented: Stephen23 on 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]

Accepted Answer

Stephen23
Stephen23 on 12 Sep 2018
Edited: Stephen23 on 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 Comment
Jordan Means
Jordan Means on 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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More Answers (1)

Bruno Luong
Bruno Luong on 12 Sep 2018
Edited: Bruno Luong on 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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