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rautio said:Hi Adel-48 -- Actually, as you can probably guess by my blunder above, I am not very strong in matrix theory either. 1e-5 sounds pretty bad, but frankly, I have no practical idea if that is good or bad, I have nothing to reference to. As I mentioned above, if I can turn a matrix that is filled to double precision (or single precision if memory is limited), and get a good clean current distribution out, then I consider it a well conditioned matrix. If a condition number of 1e-5 will do that, then I will consider that good. But..what condition number corresponds to a well conditioned matrix is a personal subjective judgement. Someone else might look at exactly the same matrix and say that it is terrible and be 100% right, which I think is the situation we have in this thread. Two completely different opinions. Both completely correct.