How to extract the diagonal of a given matrix?

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Elruz Rahimli
Elruz Rahimli 2017-9-7
评论： Elruz Rahimli 2017-9-7
How can I extract the diagonal of a given matrix with using size? I know we can do it directly with diag.
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José-Luis
José-Luis 2017-9-7
Read the documentation on ind2sub() and sub2ind(). Having done that and using the fact that the diagonal of a square matrix is where I == J (keeping the nomenclature from the documentation) would allow you to solve your problem.
Elruz Rahimli
Elruz Rahimli 2017-9-7
Thank you for the directions. I am doing it.
Too bad that I cannot upvote in the comments section.

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KL
KL 2017-9-7
A(sub2ind(size(A),1:size(A,1),1:size(A,2)))

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