MATLAB: Access to array elements

Question

Hi,

I have a matrix, A, and I want to access the elements given by the vectors ind_rows, ind_cols. If I make A(ind_rows,ind_cols) I get a matrix of size ind_rows times ind_cols, but I am just interested in the diagonal of this matrix!

I have found a way to do this:

siz = size(A);
AA  = A(1:end); % convert the matrix in a vector
IND = sub2ind(siz,ind_rows,ind_cols);
res = AA(IND);

It works, but I guess there must be a way to do this without rearranging the matrix in a vector, and in a cleaner way.

Thanks in advance!

Ana

Answer 1

http://www.mathworks.com/help/techdoc/math/f1-85462.html

Kindest Regards.

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