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Hello Hong,
Thank you for the clarification. If I already have a BAIJ matrix format, can I then convert it later into AIJ format as well ?! In that case I would have two matrices, but that would be ok for testing. I think that you sometimes convert different matrix formats into each other ?! Since I typically have BAIJ format, I also use a blocked ILU, which would turn into a point wise ILU for an AIJ matrix. That is why I typically have the BAIJ format. Otherwise, I have to change it into an AIJ format from the beginning. Thanks for the quick help, Frank