About row and column swapping in a matrix

Question

Mohammad 2015-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/230713-about-row-and-column-swapping-in-a-matrix

评论： Rakib Seemanto 2020-11-1

Hi Guys. I have a question which probably could be easy or might have built in function but I kinda stuck on it. Attached is a 3x3 matrix as an image as appeared below. I want to swap the rows and columns as shown here and save each sequence of swapping. I have a very big file to handle, i have just shown a small sample here. I tried with a loop but could not get it working. I would greatly appreciate any efforts.

Thanks Rafiq

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Answer 1

Star Strider 2015-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/230713-about-row-and-column-swapping-in-a-matrix#answer_186865

编辑：Star Strider 2015-7-22

在 MATLAB Online 中打开

I would just use circshift:

A = [0 1 2; 1 1.4 2.2; 2 2.2 2.8];
B = circshift(A, [-1 -1])
B =
          1.4          2.2            1
          2.2          2.8            2
            1            2            0

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Star Strider 2015-7-23

My pleasure.

Rakib Seemanto 2020-11-1

how can I swap 6x6 matrix middle two rows.A = [ 1 2 3;4 5 6;7 8 9;10 11 12;13 14 15;16 17 18]

The output will be:B = [ 1 2 3;4 5 6;10 11 12;7 8 9;13 14 15;16 17 18]

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Answer 2

Walter Roberson 2015-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/230713-about-row-and-column-swapping-in-a-matrix#answer_186821

在 MATLAB Online 中打开

To swap column J with column K you would use

newArray = oldArray;
newArray(:,[K J]) = newArray(:,[J K]];

For swapping rows,

newArray([K J],:) = newArray([J K],:);

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Mohammad 2015-7-22

Thanks Walter. I actually used this technique and used a loop. The problem is when you swap the columns, all the columns are swapped and same with rows. If you look at my matrix, first I want to swap all the columns (top 3 matrix), then I want to swap first row with second row and swap all the columns (middle 3 matrix), and finally I want to swap row 2 with row 3 and swap all the columns again (the last three matrix). My loop is not working the way I want it. Thanks for looking into the problem. I appreciate it.

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