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calculate matrix from elements of other matrix

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Ilya on 19 Nov 2015
Closed: Walter Roberson on 19 Nov 2015
Given matrix A = [a(i,j)], what is an efficient and (if possible) concise/readable way to calculate matrix B with elements b(i,j) = a(i,i) - a(i,j)*a(j,i) (or any other such formula)? What currently comes to mind is:
[i, j, ~] = find(A);
b = arrayfun(@(x,y) A(x,x) - A(x,y)*A(y,x), i, j);
b = reshape(b, size(A));

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