Finding the diagonal vector from a square matrix

Hi
I'm trying to find the diagonal of an square matrix but NOT the diagonal vector of the matrix from left to right. I'm trying to find the diagonal of an matrix fram right to left. Below is an example of what I'm trying to achieve:
A = [2 9 4; 4 9 2; 1 5 0];
diagA = diag(A); %Diagonal of the A matrix from left to right
%THE ANSWER: digA = [2 9 0]'
But what I'm trying to get is the diagonal from the A matrix from right to left for [4 9 1]
Is this possible? Can you please help me?

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Azzi Abdelmalek
Azzi Abdelmalek 2012년 9월 20일
편집: Azzi Abdelmalek 2012년 9월 20일

1 개 추천

A = [2 9 4; 4 9 2; 1 5 0]
fliplr(diag(flipud(A))')

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Lily
Lily 2012년 9월 20일
thx so much Azzi ;) This is a really cool soultion!
or simpler
diag(rot90(A))'
or
diag(fliplr(A))'
Also, for any square matrix with N rows:
A(N:N-1:N^2-1)
A(numel(A)-size(A,1)+1:-2:size(A,1))

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도움말 센터File Exchange에서 Operating on Diagonal Matrices에 대해 자세히 알아보기

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2012년 9월 20일

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