Azzera filtri
Azzera filtri

Change column and row

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nur yusof
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.

Risposta accettata

Dennie
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

Più risposte (1)

Ilham Hardy
Ilham Hardy il 22 Feb 2016
Modificato: Ilham Hardy il 22 Feb 2016
There are built-in matlab functions for this..
  2 Commenti
Ilham Hardy
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
nur yusof il 22 Feb 2016
Awesome. Thank you so much.

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