change diagonal to 1
in [Matlab]
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From: Wendy on 27 Jun 2010 14:13 Hi all, I have a big square matrix, and I want to change the diagonal elements to 1. Is there a way that I can change the diagonal elements at once, instead of looping through all the elements one by one. As an example, A = [3 2 1; 4 5 6; 7 8 9]; and I want A = [1 2 1; 4 1 6; 7 8 1]. Thanks, Wendy
From: James Tursa on 27 Jun 2010 14:31
"Wendy " <wlq121(a)gmail.com> wrote in message <i084bh$b3k$1(a)fred.mathworks.com>... > Hi all, > > I have a big square matrix, and I want to change the diagonal elements to 1. Is there a way that I can change the diagonal elements at once, instead of looping through all the elements one by one. > > As an example, > > A = [3 2 1; > 4 5 6; > 7 8 9]; > > and I want > A = [1 2 1; > 4 1 6; > 7 8 1]. > > Thanks, > Wendy [m n] = size(A); A(1:m+1:end) = 1; James Tursa |