# Change column and row

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nur yusof il 22 Feb 2016
Commentato: nur yusof il 22 Feb 2016
Hi, how can I change the positions of entire row and columns in a matrix [nxm]? For example, I want to change my entire 10th row and 10th column into entire 1st column and 1st row.
Thank you.
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### Risposta accettata

Dennie il 22 Feb 2016
Hello, You can swap columns and rows quite easily in matlab. For example:
given matrix :
matrix=[1 2 3 4 5;6 7 8 9 10; 11 12 13 14 15; 16 17 18 19 20];
i can swap column 1 and 2 by performing this operation:
matrix(:,[1,2])=matrix(:,[2,1]);
for row 1 and 2, a similar operation is done:
matrix([1,2],:)=matrix([2,1],:);
Please be aware of the sequence in which you perform this operation, since column 10 and row 10 have 1 variable in common, if you swap columns and rows sequentialy, you will mix up that one variable.
Another (manual) approach to retain information is to make a copy of the row and column you want to swap in another variable such as:
copy_matrix=matrix(:,:);
matrix(2,:)=copy_matrix(1,:);
matrix(1,:)=copy_matrix(2,:);
Hope this helps,
Dennie
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nur yusof il 22 Feb 2016
Excellent.Thank you so much.

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### Più risposte (1)

Ilham Hardy il 22 Feb 2016
Modificato: Ilham Hardy il 22 Feb 2016
There are built-in matlab functions for this..
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Ilham Hardy il 22 Feb 2016
For example,
matrix=[1 2 3 4 5;6 7 8 9 10; 11 12 13 14 15; 16 17 18 19 20];
>> matrix
matrix =
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
>> flipud(matrix)
ans =
16 17 18 19 20
11 12 13 14 15
6 7 8 9 10
1 2 3 4 5
>> fliplr(flipud(matrix))
ans =
20 19 18 17 16
15 14 13 12 11
10 9 8 7 6
5 4 3 2 1
nur yusof il 22 Feb 2016
Awesome. Thank you so much.

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