How to swap elements of the first column of the S matrix with the first line elements?

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Hi I have a matrix
A=[1 2 3;
4 5 6;
7 8 9]
but I want to switch the first column with first line like this
A=[1 4 7;
2 5 6;
3 8 9].
What it's the fast way to do it? Any help is appreciated! Thank you

Réponse acceptée

James Tursa
James Tursa le 16 Mai 2018
If only the 1st column and row are involved, e.g. a simple swap:
A1 = A(:,1);
A(:,1) = A(1,:);
A(1,:) = A1;

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