about MatCreateSeqAIJ and MatCreateMPIAIJ

[Yixun Liu]

Hi,
I am confused with this two routines.

MatCreateMPIAIJ(PETSC_COMM_WORLD,...) creates a parallel matrix,which will be distributed on all the processors. MatCreateSeqAIJ(PETSC_COMM_SELF, ...) creates a sequential matrix. But because this routine will be called by each processor, which processor create this matrix?

Best,

Yixun
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