# swap columns of a matrix

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Rasmus on 25 Feb 2014
Hello guys/girls
How do i swap columns??
I have this
k_minus =
-46 -43 -26 -14 7 19 11 32 39 45 45
0 -4 -7 -7 -44 -44 -7 -7 -15 -15 0
and I want the columns to be in opposite order - How do I do this? and can do this in one go?
Easy way is to swap the coloums based on the positon
For example:
A=[10 20 30;
40 50 60];
swap the coloum 1 to 2 can be done by
A(:,[2 1 3])
ans =
20 10 30
50 40 60
Exact approach can be adopted ot swap rows
A([2 1],:)
ans =
40 50 60
10 20 30
I think, this can be easy way with minium code.
Enjoy :)

Thomas on 25 Feb 2014
Edited: Thomas on 25 Feb 2014
You could also use
out= fliplr(k_minus)
Rasmus on 25 Feb 2014
That is actually easier! :)

Mischa Kim on 25 Feb 2014
Edited: Mischa Kim on 25 Feb 2014
Use
k_minus_rev = k_minus(:, [length(k_minus(1,:)):-1:1])
kk on 2 Apr 2019
Thank you for this answer! It has helped me "merge" two matrices, i.e. creating a matrix consisting of the first column of matrix A, first column of matrix B, second column of matrix A, second column of matrix B, etc.

rishabh gupta on 12 Jan 2018
you can also use: k_minus_rev = k_minus(:, [length(k_minus):-1:1])
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Helen Joan on 30 Apr 2019
is it possible to do this with a loop?