How can I swap two columns of a matrix in MATLAB?

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Deepak
Deepak 2019-6-6
评论： Walter Roberson 2023-2-25
How can I swap two columns of a matrix in MATLAB?
  2 个评论
David Sinex
David Sinex 2022-10-3
In a single line using fliplr() and given 2 indices idx1 & idx2,
idx1 = 2;
idx2 = 5;
AA(:,[idx1,idx2]) = fliplr(AA(:,[idx1,idx2]));

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回答（1 个）

Manvi Goel
Manvi Goel 2019-6-6
There is an easy way to extract a column of a matrix in MATLAB
Suppose you have a matrix A:
A = [1, 2, 3 ; 4, 5, 6]
Screen Shot 2019-06-07 at 12.15.44 AM.png
and you want to swap its first and the second columns.
The following can be done by extracting the first column, storing its value in a temporary variable and replacing second's value with the stored value:
v = A(:, 1);
A(:, 1) = A(:, 2);
A(:, 2) = v;
Screen Shot 2019-06-07 at 12.17.19 AM.png
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Andrea
Andrea 2023-2-25
thanks! helped me as well. I hoped to take the product between the original matrix and a simple binary matrix which would perform the transformation but in my case the matrix is text cell so linear algebra operations are not possible (unless I am missing something)
Walter Roberson
Walter Roberson 2023-2-25
It is not clear what 0 or false times a text entry would be ? Are you hoping, for example, that
false * "hello"
would give a result of "0" ?

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