matlab - Matrix main diagonal change -

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i have matrix below: a=

1  2 1  2

i transform to: b=

1  1 2  2

i have tried use output of diag(a), don't know how concatenate same output twice.

it looks you're swapping anti-diagonal elements. way instead of using transpose indexing:

a([2 3]) = a([3 2]);

how above code works can access elements in matrix using column-major linear indices. means traverse matrix top bottom, left right. therefore, want access second row first column index 2, first row second column index 3. have swap 2 values, left-side indices reverse of right-side indices.


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