Switch two row of matrix

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Dusan Grdic
Dusan Grdic 2013-10-5
评论： Andrey Piavkin 2021-6-27
How to switch two row of matrix? For example: matrix A is: 1 3 4; 2 4 5 and Y want to be 2 4 5; 1 3 4 ?
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madhan ravi
madhan ravi 2019-2-21
编辑：madhan ravi 2019-2-21
A more efficient answer had been accepted 5 years ago.

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Azzi Abdelmalek
Azzi Abdelmalek 2013-10-5
编辑：Azzi Abdelmalek 2013-10-5
A=[1 3 4; 2 4 5]
A([1 2],:)=A([2 1],:)
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Kevin Moss
Kevin Moss 2021-6-12
can anyone explain the logic behind why/how this works?
Andrey Piavkin
Andrey Piavkin 2021-6-27
this works pretty clear
we take first and second all the row and make it equal to second and first all the row
for example, if you wanted to switch the third and the first row, you should type like this:
A([1 3], :) = A([3 1], :)
where ':' at second place stands for taking all the columns and '[1 3]' stands for first and third row

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Pontus Vikstål
Pontus Vikstål 2019-8-12
编辑：Pontus Vikstål 2019-8-12
This way might be even faster.
A = [1 3 4; 2 4 5]
x = [0 1;1 0];
A = x*A
Then there's also this way
A = [1 3 4; 2 4 5]
A = flip(A)
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madhan ravi
madhan ravi 2020-7-25
If A has more than two rows this won’t work.
Luis Mendez Lopez
Luis Mendez Lopez 2020-9-22
Yeah i will do that with my 600*600 matrix

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