If compact code is more important than performance you can do A[tril(trues(A))]. Otherwise the loop solution can easily be implemented by a comprehension:
[A[i, j] for i = 1:size(A, 1), j = 1:size(A, 2) if i >= j]
If compact code is more important than performance you can do A[tril(trues(A))]. Otherwise the loop solution can easily be implemented by a comprehension:
[A[i, j] for i = 1:size(A, 1), j = 1:size(A, 2) if i >= j]