about MatMatMult()

[Yujie]

I have further checked this function.
In MatMatMult(Mat A,Mat B,MatReuse scall,PetscReal fill,Mat *C)
I am wondering
why the type of C is MATAIJ when the types of A and B are MATAIJ.
although A and B is MATAIJ, C should be dense. If C uses MATAIJ type,
it should take more memory, is it right?

thanks a lot.

Regards,
Yujie
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