On 11/01/2016 10:31 AM, Hamed Babaei wrote:
I mean non of the standard preconditioners helped to make it converged.
Like Bruno mentioned, if the standard preconditioners don't work, then you
will need to think about more complicated ones. Take a look at my video
lectures on preconditioners, for example.
There is of course also the possibility that your matrix is not correct and
indeed singular. In that case, you *have* to expect problems. Have you
verified that your numerical solutions converge to the exact ones for small
problems?
Best
W.
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