further about MatGetSubMatrices()

[Yujie]

Hi, PETSc developer

I am using MatGetSubMatrices() for my application. Because I need to exact
several matrices from the old one according to my index sets. These index
sets are not sorted. To MPIDense matrix, it didn't work. could you give me
some help? thanks a lot.

Happy holiday:).

Regards,

Yujie
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