swapping rows in a matrix

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Stijn Bier
Stijn Bier 2019-11-26
评论： Adam Danz 2020-8-11
How can i create a matrix which is a copy of an other matrix except 2 rows have to swap.
for example 4*4nmatrix called M how can i create an new matrix which is a copy of M, but the first and the third row are swapped

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Stephen23
Stephen23 2019-11-26
>> X = [1,3]; % rows to swap
>> M = randi(9,4,5)
M =
6 7 6 2 9
2 3 2 1 1
1 6 9 7 9
4 6 7 5 2
>> W = M;
>> W(X,:) = W(X([2,1]),:)
W =
1 6 9 7 9
2 3 2 1 1
6 7 6 2 9
4 6 7 5 2
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Narayan Sharma
Narayan Sharma 2020-8-11
what does the [2,1] call for
Adam Danz
Adam Danz 2020-8-11
With the syntax W(X([A,B]),:) row A becomes row 1 and row B becomes row 2.
Indexing is lesson 1 in Matlab.
https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html

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